JP6909389B2 - Wireless communication device - Google Patents

Description

The present invention relates to a wireless communication device that utilizes a retransmission header.

A communication frame (hereinafter referred to as a D-STAR frame) of a standard method (abbreviated as D-STAR: Digital Smart Technologies for Amateur Radio) of amateur radio digitization technology is composed of a radio section header and data. The radio section header includes management information such as a call sign. The data includes a voice segment and a data segment.

JP-A-2007-0432332

The radio section header is transmitted only once immediately after the PTT (Push To Talk) switch is pressed and the transmission is started. If the receiving station misses the radio header, the management information such as the call sign cannot be used. Therefore, even if the receiving station can tune to the frequency at which the sound is output, it cannot display who is transmitting by which route, and cannot call back to the other party. The transmitting station can use the data segment to transmit a retransmission header having the same content as the radio header. However, since there is no error correction in the retransmission header, there is a problem that the reliability is poor.

Further, when the D-STAR frame is transferred via the Internet network, the content of the radio unit header is rewritten by the D-STAR gateway, but the content of the retransmission header is not rewritten. Therefore, if the receiving station receives the D-STAR frame from the middle and cannot receive the radio part header and receives only the retransmission header, the route determination does not work correctly and the wrong route is displayed, or the other party normally displays the route. There was a problem that there were cases where it could not be recalled.

The present invention has been made in view of the above, and is a wireless communication device capable of extracting information for calling a partner station more accurately even when a communication frame of an amateur radio digital communication method is received from the middle. The purpose is to provide.

The wireless communication device according to the present invention uses the same retransmission header when the wireless unit header is not received, and the receiving unit that acquires the retransmission header included in the data transmitted after the wireless unit header. It is characterized by including a determination unit for determining that the retransmission header is valid when it is received more than a predetermined number of times.

According to the present invention, even when a communication frame of an amateur radio digital communication system is received from the middle, information for calling a partner station more accurately can be extracted.

It is a schematic diagram which shows the structure of the communication system in which the wireless communication device of this embodiment is used. It is a figure which shows the structure of the D-STAR frame. It is a figure which shows the structure of the retransmission header which is transmitted using the data segment of the D-STAR frame. It is a functional block diagram which shows the structure of the wireless communication apparatus of this embodiment. It is a flowchart which shows the flow of the process of determining the validity of the retransmission header of this embodiment. It is a figure which shows the difference between a radio part header and a retransmission header. It is a figure for demonstrating the process of estimating a radio part header based on own transmission setting and retransmission header.

Hereinafter, the wireless communication device of one embodiment will be described with reference to the drawings.

First, a communication system in which the wireless communication device of the present embodiment is used will be described with reference to FIG.

In the communication system shown in the figure, a plurality of zones A and B are connected to the Internet network via a gateway device (GW). Each zone A, B is composed of one or more repeater areas 1 to 4. In each of zones A and B, repeater areas 1, 2, 3 and 4 are connected to the assist station by a trunk line. Each repeater area 1 to 4 is formed by a repeater station. The terminal station connects to the repeater stations forming the repeater areas 1 to 4 in which the terminal station exists. The terminal station communicates with other terminal stations directly or via a repeater station. A call sign is given as identification information to the repeater station, the assist station, the GW, and the terminal station.

When communicating using the repeater station, the terminal station sets the call sign of the relay station in the radio section header of the D-STAR frame. More specifically, the terminal station sets the call sign of the destination relay station, the call sign of the source relay station, the call sign of the partner station, and the call sign of its own station in the radio section header. For the call sign of the destination relay station, the call sign of the repeater stations in the repeater areas 1 to 4 where the partner station exists is set. For the call sign of the sending relay station, the call sign of the repeater stations in the repeater areas 1 to 4 in which the own station exists is set.

When the terminal station communicates with another zone, the call sign of the GW of the own zone is set as the call sign of the destination relay station. For example, in FIG. 1, when a terminal station having a call sign belonging to repeater area 1 of "J ¥ 1QQQ" communicates with a terminal station having a call sign belonging to repeater area 4 of "J ¥ 1WWW", the header shown in FIG. Like the information H1, the call sign of the GW of the zone A, "J ¥ 1TTTG", is set as the call sign of the destination relay station.

When the GW in zone A receives the D-STAR frame to another zone B, it inquires the management server about the information of the partner station and rewrites the call sign of the relay station in the radio section header. Specifically, the GW in zone A uses the header information H1 in FIG. 1 as the header information H2, and the call sign of the destination relay station as the call sign of the repeater station in the repeater area 4 where the other station exists. Rewrite to "¥ 1SSS" and rewrite the call sign of the sending relay station to "J ¥ 1VVV G" which is the call sign of the GW in Zone B.

When the GW in zone B receives the D-STAR frame, it transfers the D-STAR frame according to the information in the radio unit header.

On the other hand, when the terminal station that has received the above D-STAR frame calls back, the call sign of the GW in zone B is set as the call sign of the destination relay station as shown in the header information H3 of FIG. When the GW in the zone B receives the D-STAR frame to another zone A, the GW rewrites the header information H3 like the header information H4 and transfers the D-STAR frame to the zone A.

In the D-STAR frame beyond the zone, the call sign of the relay station of the radio unit header is rewritten by the GW, but the retransmission header transmitted using the data segment is not rewritten and passes through the GW as it is. That is, in FIG. 1, the call sign set in the retransmission header transmitted from the terminal station in zone A to zone B remains the call sign of the header information H1 set in the radio unit header at the beginning of transmission.

Next, the D-STAR frame will be described with reference to FIG. As shown in FIG. 2, the D-STAR frame is composed of a radio unit header and data.

The radio section header consists of bit synchronization, frame synchronization, flags 1-3, ID, and P_FCS. Bit synchronization is a synchronization signal for timing bits. The frame synchronization is a synchronization signal for knowing the start point of the D-STAR frame. Information such as distinction of data to be transmitted is set in flags 1-3. The ID includes a destination relay station call sign, a source relay station call sign, a partner station call sign, and a own station call sign. P_FCS is a CRC (Cyclic Redundancy Check) for error checking for flags 1-3 and ID. Of the radio unit headers, flags 1-3, ID, and P_FCS are given an error correction code and interleaved so that an error can be detected and corrected for noise.

The data contains alternating audio and data segments, and finally the last frame. The voice segment contains a voice signal in which the voice to be transmitted is compressed. The data segment contains communication data to be transmitted. A mini header and communication data are constructed by connecting two consecutive data segments. The purpose of communication data is set in the mini header. A resynchronization signal for resynchronization is inserted into the data segment every 21st.

Next, with reference to FIG. 3, the retransmission header transmitted in the data segment will be described.

The terminal station can use the data segment to retransmit the radio header. The retransmission header includes flags 1-3, ID, and P_FCS among the radio unit headers, and does not include bit synchronization and frame synchronization. An error correction code is not added to the retransmission header. A plurality of consecutive data segments are used to transmit the retransmission header. When transmitting the retransmission header in the data segment, the terminal station sets the value of "0x5 *" in the mini header. The terminal station on the receiving side connects the communication data transmitted in the data segment to construct a retransmission header.

Next, the wireless communication device 100 of the present embodiment will be described with reference to FIG. The wireless communication device 100 corresponds to the terminal station shown in FIG.

The wireless communication device 100 includes a main controller unit 1, a display unit 11, an operation unit 12, a peripheral unit 13, a baseband signal processing unit 2, a vocoder 21, an audio codec unit 3, a transmission unit 41, a reception unit 42, and an RF switch 43. It includes an antenna 5, a microphone 6, and a speaker 7.

The main controller unit 1 controls the entire wireless communication device 100. The main controller unit 1 can be configured by a CPU (Central Processing Unit). In the present embodiment, the main controller unit 1 acquires the retransmission header from the data of the D-STAR frame, determines the validity of the retransmission header, and extracts information for calling the partner station from the retransmission header determined to be valid. do. Specifically, when the same retransmission header is received a plurality of times, the main controller unit 1 determines that the retransmission header is correct. Further, when the main controller unit 1 cannot receive the radio unit header, the main controller unit 1 estimates the radio unit header from its own transmission setting and the information of the retransmission header.

A display unit 11, an operation unit 12, and a peripheral unit 13 are connected to the main controller unit 1.

The display unit 11 displays various types of information in response to an instruction from the main controller unit 1. The display unit 11 can be configured by, for example, an LCD (Liquid Crystal Display).

The operation unit 12 includes a PTT switch and various operation keys, and accepts operations from the user. The main controller unit 1 performs processing according to the operation input by the operation unit 12.

The peripheral portion 13 has peripheral functions such as a GPS (Global Positioning System) module and a function of operating the wireless communication device 100 as a USB device. The peripheral unit 13 may have a storage device that stores reception history information based on the information extracted from the retransmission header.

When the PTT switch is pressed to start transmission, the main controller unit 1 determines the transmission destination and the route, and transmits the transmission setting information to the baseband signal processing unit 2.

The baseband signal processing unit 2 receives the transmission setting information from the main controller unit 1, constructs a radio unit header based on the transmission setting information, and delivers it to the transmission unit 41 as a baseband signal.

After that, the audio codec unit 3 converts the audio signal input from the microphone 6 into PCM (Pulse Code Modulation) data. The vocoder 21 compresses the PCM data and converts it into an audio frame. The baseband signal processing unit 2 constructs an audio frame as an audio segment, further constructs data to be transmitted as a data segment, and delivers it to the transmission unit 41 as a baseband signal at an appropriate timing.

When the PTT switch is released, the main controller unit 1 notifies the baseband signal processing unit 2 of the end of transmission. When the end of transmission is notified, the baseband signal processing unit 2 constructs the last frame and delivers it to the transmission unit 41 as a baseband signal.

At the time of reception, the baseband signal processing unit 2 receives the baseband signal demodulated from the radio signal from the receiving unit 42, processes the baseband signal, and acquires a D-STAR frame. Of the acquired D-STAR frames, the baseband signal processing unit 2 delivers the data obtained from the radio unit header and the data segment to the main controller unit 1, and delivers the audio frame obtained from the audio segment to the vocoder 21. The vocoder 21 converts the audio frame into PCM data. The audio codec unit 3 converts the PCM data into an AF (Audio Frequency) signal and outputs it to the speaker 7.

The transmission unit 41 modulates the carrier wave with a baseband signal and outputs it as a radio signal from the antenna 5 via the RF switch 43.

The receiving unit 42 demodulates the radio signal received by the antenna 5 into a baseband signal.

The RF switch 43 outputs the signal input from the transmitting unit 41 to the antenna 5 at the time of transmission, and outputs the signal input from the antenna 5 to the receiving unit 42 at the time of receiving.

Next, the process of determining the validity of the retransmission header will be described with reference to FIG.

An error correction code is not added to the retransmission header, and CRC errors frequently occur depending on the radio wave environment. Alternatively, even if a bit error occurs, the CRCs may coincide with each other by chance. In order to effectively utilize the retransmission header, the main controller unit 1 determines the validity of the retransmission header by the determination process described below.

The determination process of FIG. 5 starts when the main controller unit 1 constructs a retransmission header from a plurality of data segments for the D-STAR frame that has not received the radio unit header. The main controller unit 1 does not perform the determination process of FIG. 5 for the D-STAR frame for which the retransmission header has already been determined to be valid.

The main controller unit 1 checks for the presence or absence of the retransmission header saved for checking, and determines whether or not the retransmission header has not been received (step S11). When the retransmission header is received for the first time, the retransmission header for checking is not saved, and it is determined that the retransmission header has not been received.

If the retransmission header has not been received, the main controller unit 1 resets the check counter (step S12), saves the received retransmission header for checking (step S13), and ends the determination process. The next time a retransmission header is received, the retransmission header for checking is saved, so it is determined that the retransmission header has been received. The retransmission header for checking may be stored in the storage means provided in the main controller unit 1.

When the retransmission header has been received, the main controller unit 1 determines whether or not the received retransmission header completely matches the retransmission header saved for checking (step S14).

If the received retransmission header and the check retransmission header do not match, the main controller unit 1 resets the check counter (step S12), saves the received retransmission header for checking (step S13), and performs a determination process. finish. Regarding the retransmission header for checking, the retransmission header saved for checking may be retained as it is, and the newly received retransmission header may be discarded. Alternatively, when saving the retransmission header for checking, the one in which the CRC check is OK may be saved.

When the received retransmission header and the check retransmission header match, the main controller unit 1 increments the check counter (step S15) and determines whether or not the check counter has expired (step S16). The main controller unit 1 determines that the check counter has expired when the check counter reaches a predetermined value (for example, 2 to 3). That is, the main controller unit 1 determines that the check counter has expired when the same retransmission header is received a predetermined number of times. If the check counter has not expired, the determination process ends.

When the check counter expires, the main controller unit 1 checks the CRC using P_FCS in the retransmission header (step S17).

If the CRC check is OK, the main controller unit 1 determines that the retransmission header is valid (step S18).

When the CRC check is NG, the main controller unit 1 resets the check counter (step S19) and clears the check retransmission header (step S20).

The validity of the retransmission header can be determined by the above processing. The main controller unit 1 displays the information obtained from the retransmission header determined to be valid as reception information or saves it as reception history information.

Next, the process of estimating the wireless unit header from the retransmission header will be described.

As described with reference to FIG. 1, in the D-STAR frame beyond the gateway, the call sign of the relay station of the radio section header is rewritten by the gateway, but the retransmission header transmitted using the data segment is rewritten. Pass through the gateway as it is without. That is, the call sign of the relay station in the retransmission header is the content set by the transmitting station in the radio section header at the beginning of transmission. As shown in FIG. 6, in the D-STAR frame beyond the gateway and the D-STAR frame using the node station, the contents of the radio section header and the retransmission header are different. If there is a difference between the contents of the wireless section header and the retransmission header, there may be a case where the other party cannot be called normally.

The wireless communication device 100 extracts information for calling the other party by estimating the wireless unit header based on its own transmission setting and the contents set in the retransmission header.

FIG. 7 is a diagram for explaining a process of estimating the radio unit header based on its own transmission setting and the retransmission header. In FIG. 7, its own transmission setting, the source relay station call sign (R1) transmitted by the partner station (received by the own station), the destination relay station call sign (R2), and the partner station call sign (UR). Is shown. FIG. 7 shows a DR (D-STAR REPEATER) mode and a DV (DIGITAL VOICE) mode as its own transmission settings, and the DR mode is divided into communication using a repeater and communication other than that. In addition, it indicates whether or not direct reply is possible for each of its own transmission settings. The direct reply is a function that can be easily called by simply pressing the PTT switch to the receiving party in the communication using the repeater in the DR mode. When answering a CQ or a call addressed to you immediately, the transmission setting is automatically changed temporarily and you can answer. Alternatively, it also includes the meaning of indicating whether or not it is possible to switch to the transmission setting that responds to the other party by a one-touch operation even if the direct reply cannot be performed.

The DR mode is a mode in which a list of publicly available D-STAR repeaters is selected and the specified repeater is directly received. The list of repeaters includes information such as repeater name, transmission frequency, reception frequency, call sign, gateway call sign, and installation location (latitude / longitude). Further, in the DR mode, communication using the node station is also possible by additionally registering the known D-STAR node station to the repeater list. As described above, in the DR mode, there are cases where the transmission setting itself is a setting for communicating using a repeater and a setting for communicating without using a repeater. Since there is a rule that the upper 3 digits of the call sign of the repeater always include a number, if the upper 3 digits of the call sign of R1 of the own transmission setting contains a number, it is judged that the communication setting uses the repeater. do. In cases other than repeaters, in general, the keyword "DIRECT" is set when communicating with a node station.

The DV mode is a mode in which the frequency is tuned by an operation knob of an encoder or the like, similar to the VFO mode of an analog FM. It relies on frequency and is mainly used by scanning the band. It is also used when communicating at the frequency of a known D-STAR node station.

First, a case where the transmission setting of the wireless communication device 100 is the DR mode and communication with the repeater will be described. If R1 of the retransmission header is the same as the call sign of the access repeater of its own transmission setting, the main controller unit 1 determines that the gateway is not exceeded. If it does not exceed the gateway, the radio section header has not been rewritten, and the radio section header and the retransmission header are the same. At the time of direct reply, the other party can be called based on the contents of the retransmission header.

If R1 of the retransmission header is different from the call sign of the access repeater of its own transmission setting, the main controller unit 1 determines that the gateway has been exceeded. The main controller unit 1 replaces R1 of the retransmission header with the gateway call sign of its own access repeater, and replaces R2 of the retransmission header with the call sign of its own access repeater to generate the radio unit header. When calling CQ beyond the gateway, a special call sign with a slash at the beginning is used, so the main controller unit 1 replaces the UR of the retransmission header with CQCQCQ. Even if the communication is over the gateway, a direct reply can be made using the radio section header generated from its own transmission setting and the retransmission header.

Next, a case where the transmission setting of the wireless communication device 100 is the DR mode and communication is performed with a device other than the repeater will be described. In this case, the main controller unit 1 treats the communication as using the node station, and replaces R1 and R2 with "DIRECT" indicating direct communication regardless of the information in the retransmission header.

Finally, a case where the transmission setting of the wireless communication device 100 is the DV mode will be described. In the case of DV mode, direct communication or communication using a node station is assumed. In either case of direct communication or communication using a node station, the main controller unit 1 replaces R1 and R2 with "DIRECT" indicating direct communication.

As described above, there are cases where the route cannot be determined only by the retransmission header. Therefore, it is desirable to notify the user on the display unit 11 or the like whether or not the call back is possible.

When the display unit 11 displays the reception information extracted from the retransmission header, the user may be notified that the reception information is the reception information extracted from the retransmission header. Then, the user may be allowed to select whether to set the transmission setting according to the retransmission header. The user may be allowed to select whether or not to utilize the retransmission header in the setting menu or the like.

Next, another method of using the retransmission header will be described.

Since the call sign is not rewritten by the gateway, the retransmission header is likely to contain the access repeater information of the transmitting station. The main controller unit 1 searches the repeater list held for the access repeater information of the transmitting station set in the retransmission header, and if there is a matching repeater, determines that the repeater is the access repeater of the transmitting station. Since the repeater list contains information on the installation location, it is possible to know the rough position of the transmitting station without the transmitting station transmitting the location information, and it can be used for reception display and reception history information. be.

As described above, when the wireless communication device 100 of the present embodiment does not receive the wireless section header of the D-STAR frame, it acquires the retransmission header included in the data and obtains the same retransmission header a predetermined number of times. Is received, the retransmission header is determined to be valid. As a result, even when the radio unit header is not received, it is possible to extract information for calling the partner station more accurately.

The wireless communication device 100 of the present embodiment extracts information for calling the partner station based on the retransmission header determined to be valid and its own transmission setting. As a result, even when the gateway rewrites the radio section header, it is possible to extract the information for calling the partner station.

The wireless communication device 100 of the present embodiment searches the repeater list for the access repeater information of the transmitting station set in the retransmission header, and uses the installation location described in the repeater list as the location information of the transmitting station. As a result, the rough position of the transmitting station can be known without the transmitting station transmitting the position information.

100 ... Wireless communication device 1 ... Main controller 11 ... Display 12 ... Operation 13 ... Peripheral 2 ... Baseband signal processing 21 ... Vocoder 3 ... Audio codec 41 ... Transmitter 42 ... Receiver 43 ... RF switch 5 … Antenna 6… Microphone 7… Speaker

Claims (3)

A receiver that acquires the retransmission header included in the data transmitted after the radio header, and
When the wireless unit header is not received, a determination unit for determining that the retransmission header is valid when the same retransmission header is received more than a predetermined number of times, and a determination unit.
Equipped with a,
Wireless communication device characterized that you extract information to call the other station based on determined to be valid the retransmission header and its own transmission setting. The wireless communication device according to claim 1, wherein an error correction code is assigned to the radio unit header, and no error correction code is assigned to the retransmission header. The information of the relay station set in the retransmission header determined to be valid is searched from the list of relay stations held by the user, and the position information described in the list of relay stations is used as the position information of the partner station. The wireless communication device according to claim 1 or 2 , wherein the wireless communication device is characterized.

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