Wireless communication system, wireless communication method, and transmitting device

Abstract

A wireless communication method according to one embodiment involves: dividing each of a plurality of user signals by the number of a plurality of frequency channels of an active system; allocating each of the divided plurality of user signals to each of the plurality of frequency channels of the active system; transmitting the plurality of user signals respectively allocated to the plurality of frequency channels of the active system to the respective frequency channels of the active system; when an abnormality occurs in any of the plurality of frequency channels of the active system to which each of the plurality of user signals is transmitted, switching the frequency channel of the active system where the abnormality has occurred to a frequency channel of a redundant system; receiving each of the transmitted plurality of user signals for each frequency channel; and combining each of the plurality of user signals received for each frequency channel so as to be a plurality of user signals for each user.

Description

[Technical field]

[0001] The present invention relates to a wireless communication system, a wireless communication method, and a transmitting device. [Background technology]

[0002] In wireless communication systems, there is known a technique for automatically switching to a redundant frequency channel (standby system) when an active relay wireless device breaks down or when interference occurs in an active frequency channel, causing a line disconnection.

[0003] For example, in frequency diversity of a digital microwave system, a system switching function is known that switches one of a plurality of currently used systems, which has become disconnected, to a spare system on a system-by-system basis (see, for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Takaaki Ichikawa, "A Study on Diversity Methods in Digital Wireless Communications," Osaka University Knowledge Archive, July 31, 2000. Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Non-Patent Document 1 has the problem that one user occupies one frequency channel to transmit packets, and therefore, regardless of the priority of the packets, all packets of one user are lost during the momentary interruption caused by switching to the redundant system.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a wireless communication system, a wireless communication method, and a transmitting device that, when an abnormality occurs in a current frequency channel, can switch to a redundant frequency channel while reducing user signal loss per user. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a wireless communication system in which a plurality of user signals are transmitted from a transmitting device to a receiving device using a plurality of frequency channels including an active system and a redundant system, the transmitting device having a division and allocation unit that divides each of the plurality of user signals into a plurality of frequency channels of the active system and allocates each of the divided plurality of user signals to each of the plurality of frequency channels of the active system, a transmitting unit that transmits each of the plurality of user signals allocated by the division and allocation unit to the receiving device for each of the plurality of frequency channels of the active system, and a switching unit that, when an abnormality occurs in any of the plurality of frequency channels of the active system through which the transmitting unit transmits each of the plurality of user signals, switches the frequency channel of the active system in which the abnormality has occurred to a frequency channel of a redundant system, and the receiving device having a receiving unit that receives each of the plurality of user signals transmitted by the transmitting unit for each frequency channel, and a combining unit that combines each of the plurality of user signals received by the receiving unit for each frequency channel into a plurality of user signals for each user.

[0008] Moreover, a wireless communication method according to one aspect of the present invention is a wireless communication method for transmitting a plurality of user signals using a plurality of frequency channels including an active system and a redundant system, the method comprising the steps of: dividing each of the plurality of user signals into a plurality of frequency channels of the active system and allocating each of the divided plurality of user signals to each of the plurality of frequency channels of the active system; transmitting each of the plurality of user signals allocated to each of the plurality of frequency channels of the active system for each of the plurality of frequency channels of the active system; when an abnormality occurs in any of the plurality of frequency channels of the active system that transmits each of the plurality of user signals, switching the frequency channel of the active system in which the abnormality has occurred to a frequency channel of the redundant system; receiving each of the transmitted plurality of user signals for each frequency channel; and combining each of the plurality of user signals received for each frequency channel to form a plurality of user signals for each user.

[0009] Furthermore, a transmitting device according to one aspect of the present invention is a transmitting device that transmits a plurality of user signals to a receiving device using a plurality of frequency channels including an active system and a redundant system, the transmitting device comprising: a division and allocation unit that divides each of the plurality of user signals into a plurality of frequency channels of the active system and allocates each of the divided plurality of user signals to each of the plurality of frequency channels of the active system; a transmitting unit that transmits each of the plurality of user signals allocated by the division and allocation unit to the receiving device for each of the plurality of frequency channels of the active system; and a switching unit that switches the frequency channel of the active system in which the abnormality has occurred to a frequency channel of the redundant system when an abnormality occurs in any of the plurality of frequency channels of the active system through which the transmitting unit transmits each of the plurality of user signals. Effect of the Invention

[0010] According to the present invention, when an abnormality occurs in a working frequency channel, it is possible to switch to a redundant frequency channel while reducing the number of user signals lost per user. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration of a wireless communication system according to an embodiment. [Diagram 2] FIG. 2 is a functional block diagram illustrating functions of a transmitting device according to an embodiment. [Diagram 3] 1A is a diagram illustrating a schematic example of a plurality of user signals before division and transmitted by a transmitting device, and FIG. 1B is a diagram illustrating a schematic example of a plurality of user signals after division and distribution and transmitted by a transmitting device. [Figure 4] FIG. 2 is a functional block diagram illustrating functions of a receiving device according to an embodiment. [Diagram 5] 1A is a diagram showing a typical frequency channel switched by a wireless communication system, and FIG. 1B is a diagram showing a typical user signal transmitted by the wireless communication system. [Figure 6] (a) is a diagram showing a schematic diagram of frequency channels switched by a wireless communication system. (b) is a diagram showing a schematic diagram of a user signal transmitted by the wireless communication system on frequency channel W. (c) is a diagram showing a schematic diagram of a user signal transmitted by the wireless communication system on frequency channel X. (d) is a diagram showing a schematic diagram of a user signal transmitted by the wireless communication system on frequency channel Y. (e) is a diagram showing a schematic diagram of a user signal transmitted by the wireless communication system on frequency channel Z. [Figure 7] (a) is a diagram showing a schematic diagram of frequency channels switched by a wireless communication system of a comparative example; (b) is a diagram showing a schematic diagram of a user signal transmitted by a wireless communication system of a comparative example on frequency channel W; (c) is a diagram showing a schematic diagram of a user signal transmitted by a wireless communication system of a comparative example on frequency channel X; (d) is a diagram showing a schematic diagram of a user signal transmitted by a wireless communication system of a comparative example on frequency channel Y; and (e) is a diagram showing a schematic diagram of a user signal transmitted by a wireless communication system of a comparative example on frequency channel Z. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of a wireless communication system will be described below with reference to the drawings. Fig. 1 is a diagram showing a configuration example of a wireless communication system 1 according to an embodiment. As shown in Fig. 1, the wireless communication system 1 includes a transmitting device 2 and a receiving device 3, and is configured so that the transmitting device 2 and the receiving device 3 perform wireless communication such as microwave band land fixed communication.

[0013] For example, the transmitting device 2 transmits a plurality of user signals to the receiving device 3 using a plurality of frequency channels including a working system and a redundant system. Note that the transmitting device 2 and the receiving device 3 each have a function of transmitting and receiving a plurality of user signals to and from each other, and each can also operate as a relay radio device.

[0014] Fig. 2 is a functional block diagram illustrating functions of the transmitting device 2 according to an embodiment. As shown in Fig. 2, the transmitting device 2 includes, for example, an interface (I / F) unit 21, a priority processing unit 22, a frame processing unit 23, a switching unit 24, four modulation units 25 each corresponding to a frequency channel, four RF (radio frequency) units 26 each corresponding to a frequency channel, an antenna 27, and a monitoring control unit 28.

[0015] The I / F unit 21 is a user interface that acquires, for example, three user signals A, B, and C and outputs them to the priority processing unit 22. The user signals A, B, and C are, for example, signals output by three different user terminals (not shown), respectively, and include data of different categories, such as calls, videos, texts, files, and photos.

[0016] The priority processing unit 22 performs processing to identify the priority of each user signal output by the I / F unit 21, and outputs the processed user signal to the frame processing unit 23. For example, the priority processing unit 22 processes the priority of each user signal in the same manner as the QoS (quality of services) control defined in IEEE802.11e.

[0017] The frame processing unit 23 is equipped with a division and allocation unit 230 and an arrangement processing unit 232, and performs buffering, data allocation, mapping, etc. on the user signal output by the priority processing unit 22 to generate a specified frame, and outputs the generated frame to the switching unit 24.

[0018] The division and allocation unit 230 divides each of the multiple user signals into a number of multiple frequency channels in the working system, and allocates each of the divided multiple user signals to each of the multiple frequency channels in the working system.

[0019] The arranging processor 232 processes each of a plurality of user signals so that the signals are each a signal in which a high priority packet is arranged between low priority packets. The arranging processor 232 also arranges signals as high priority packets for each user signal category or for each user.

[0020] In other words, the transmitting device 2 controls the priority of user signals by using EDCA (enhanced distributed channel access), which transmits frames (packets) of higher priority categories first, or HCCA (hybrid coordination function controlled channel access), which allocates a dedicated bandwidth to high priority frames (such as specific user signals).

[0021] When an abnormality occurs in any of the multiple working frequency channels through which the RF unit 26 transmits the multiple user signals, the switching unit 24 performs a process of switching the working frequency channel in which the abnormality occurs to a redundant frequency channel. Then, the switching unit 24 outputs the processed user signals to the four modulation units 25 for each frequency channel. The switching unit 24 also has a function of outputting an alarm to the monitoring control unit 28 when an abnormality occurs in any of the multiple working frequency channels.

[0022] Each of the modulation units 25 modulates the user signal output by the switching unit 24 for each frequency channel, and outputs the modulated user signal to the RF unit 26. Also, each of the modulation units 25 has a function of outputting an alarm to the monitoring control unit 28 when an abnormality occurs in the frequency channel of the working system.

[0023] Each of the RF units 26 includes a transmitting unit 260 and a receiving unit 262. The transmitting unit 260 transmits the user signal modulated by the modulating unit 25 via the antenna 27 for each frequency channel, for example, by time division multiplexing.

[0024] More specifically, the transmitting unit 260 transmits each of the multiple user signals (packets) allocated to the multiple working frequency channels by the division and allocation unit 230 to the receiving device 3 for each of the multiple working frequency channels.

[0025] The receiving unit 262 receives the signal transmitted by the receiving device 3 via the antenna 27, and outputs the signal to the monitoring control unit 28. In addition, each of the RF units 26 has a function of outputting an alarm to the monitoring control unit 28 when an abnormality occurs in the frequency channel of the working system.

[0026] The monitoring control unit 28 monitors whether or not an abnormality has occurred in the frequency channel of the working system, and controls each unit constituting the transmission device 2. For example, the monitoring control unit 28 detects a failure in the transmission device 2 or the reception device 3, an abnormality in the frequency channel of the working system, and performs control so that the switching unit 24 switches the frequency channel of the working system to the frequency channel of the redundant system. The monitoring control unit 28 also controls the priority processing unit 22 to process the priority of each user signal.

[0027] Fig. 3 is a diagram illustrating a schematic example of a plurality of user signals transmitted by the transmitting device 2. Fig. 3(a) is a diagram illustrating a schematic example of a plurality of user signals before division transmitted by the transmitting device 2. Fig. 3(b) is a diagram illustrating a schematic example of a plurality of user signals after division and distribution transmitted by the transmitting device 2.

[0028] As shown in Fig. 3(a), the transmitting device 2 transmits, for example, user signals of users A, B, and C at a contracted bandwidth (transmission capacity) of 150 Mbit / s. Specifically, as shown in Fig. 3(b), the transmitting device 2 divides and allocates each of the three user signals equally (for example, 50 Mbit / s each) to, for example, three currently used frequency channels W, X, and Y, and transmits them simultaneously to the receiving device 3. The frequency channel Z is a redundant frequency channel. At this time, the transmitting device 2 has a queue for each class based on the priority of the user signals, and transmits high-priority packets between low-priority packets in each of the multiple frequency channels.

[0029] Fig. 4 is a functional block diagram illustrating functions of the receiving device 3 according to an embodiment. As shown in Fig. 4, the receiving device 3 includes, for example, an antenna 31, four RF (radio frequency) units 32 each corresponding to a frequency channel, four demodulation units 33 each corresponding to a frequency channel, a switching unit 34, a frame processing unit 35, a priority processing unit 36, an interface (I / F) unit 37, and a monitoring control unit 38.

[0030] Each of the RF units 32 has a receiving unit 320 and a transmitting unit 322. The receiving unit 320 receives each of the multiple user signals transmitted by the transmitting device 2 for each frequency channel via the antenna 31, and outputs the received user signals to the demodulation unit 33. The receiving unit 320 also outputs the signal transmitted by the transmitting device 2 to the monitoring and control unit 28. The transmitting unit 322 transmits a signal to the transmitting device 2 via the antenna 31. Each of the RF units 32 also has a function of outputting an alarm to the monitoring and control unit 38 when an abnormality occurs in the frequency channel of the active system.

[0031] Each demodulation unit 33 demodulates the user signal received by the RF unit 32 for each frequency channel, and outputs the demodulated user signal to the switching unit 34. Also, each demodulation unit 33 has a function of outputting an alarm to the monitoring control unit 38 when an abnormality occurs in the frequency channel of the working system.

[0032] The switching unit 34 performs a process of switching the working frequency channel where the abnormality occurred to a redundant frequency channel when an abnormality occurs in any of the multiple working frequency channels that transmit the multiple user signals demodulated by the demodulation units 33. The switching unit 34 then outputs the processed user signals to the frame processing unit 35 for each frequency channel. The switching unit 34 also has a function of outputting an alarm to the monitoring control unit 38 when an abnormality occurs in any of the multiple working frequency channels.

[0033] The frame processing unit 35 has a synthesis unit 350, and performs buffering, data combination (synthesis), demapping, etc. on the user signal output by the switching unit 34 to generate a specified frame, and outputs the generated frame to the priority processing unit 36.

[0034] The combiner 350 combines the multiple user signals received by the RF units 32 for each frequency channel into multiple user signals for each user, thereby generating a frame.

[0035] The priority processing unit 36 ​​performs processing to identify the priority of each user signal output by the frame processing unit 35, and outputs the processed user signal to the I / F unit 37. For example, the priority processing unit 36 ​​processes the priority of each user signal in the same manner as the QoS control defined in IEEE802.11e.

[0036] The I / F unit 37 is a user interface that acquires, for example, three user signals A, B, and C output by the priority processing unit 36 ​​and outputs them to a subsequent stage.

[0037] The monitoring control unit 38 monitors whether an abnormality occurs in the frequency channel of the working system, and controls each unit constituting the receiving device 3. For example, the monitoring control unit 38 detects a failure in the transmitting device 2 or the receiving device 3, an abnormality in the frequency channel of the working system, and controls the switching unit 34 to switch the frequency channel of the working system to the frequency channel of the redundant system. The monitoring control unit 38 also controls the priority processing unit 36 ​​to process the priority of each user signal.

[0038] That is, the receiving device 3 simultaneously receives a plurality of user signals transmitted by a plurality of frequency channels, combines the plurality of divided traffics of each user, and generates a contracted bandwidth for each user.

[0039] In addition, each function possessed by each of the above-mentioned transmitting device 2 and receiving device 3 may be configured in part or in whole by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array), or may be configured as a program executed by a processor such as a CPU.

[0040] For example, the transmitting device 2 and the receiving device 3 according to an embodiment can be realized using a computer and a program, and the program can be recorded on a storage medium or provided via a network.

[0041] Next, a first operation example of the wireless communication system 1 will be described. Fig. 5 is a diagram that typically shows a user signal (see Fig. 3) in the first operation example of the wireless communication system 1. Fig. 5(a) is a diagram that typically shows a frequency channel that the wireless communication system 1 switches. Fig. 5(b) is a diagram that typically shows a user signal (packet arrangement) transmitted by the wireless communication system 1.

[0042] As shown in FIG. 5(a), when a line disconnection occurs in one of the currently used frequency channels W, X, and Y (for example, frequency channel W) due to equipment failure, radio interference, or the like, the wireless communication system 1 switches the currently used frequency channel W to the redundant frequency channel Z.

[0043] At this time, as shown in Fig. 5(b), the wireless communication system 1 loses the high priority packet of user B and the high priority packet of user C that are inserted between the low priority packets of multiple users during the redundant system switching time (instantaneous interruption time) when switching from frequency channel W to frequency channel Z. The high priority packet is a user signal whose category is, for example, a call. The low priority packet is a user signal whose category is, for example, a video.

[0044] In this way, the wireless communication system 1 according to an embodiment can switch an active frequency channel in which an abnormality (failure, etc.) has occurred to a redundant frequency channel while reducing user signal loss per user, as compared with a case in which one user occupies one frequency channel to transmit packets. Also, the wireless communication system 1 can reduce the number of discarded high-priority packets and improve the reliability of the communication line, as compared with a case in which one user occupies one frequency channel to transmit packets.

[0045] Next, a description will be given of a second operation example of the wireless communication system 1. Fig. 6 is a diagram illustrating a user signal (see Fig. 3) in the second operation example of the wireless communication system 1.

[0046] Fig. 6(a) is a diagram showing a typical frequency channel switched by the wireless communication system 1. Fig. 6(b) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system 1 on frequency channel W. Fig. 6(c) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system 1 on frequency channel X. Fig. 6(d) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system 1 on frequency channel Y. Fig. 6(e) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system 1 on frequency channel Z.

[0047] As shown in FIG. 6(a), in the wireless communication system 1, when a line disconnection occurs for one of the currently used frequency channels W, X, and Y (for example, frequency channel W) due to an equipment failure, radio interference, or the like, the currently used frequency channel W is switched to a redundant frequency channel Z.

[0048] At this time, as shown in Fig. 6(b), the wireless communication system 1 discards user signals (multiple high priority packets and low priority packets) in frequency channel W during the switching time. The high priority packets are, for example, the user signals of user A. The low priority packets are, for example, the user signals of users B and C. Specifically, in frequency channel W, the high priority packet of user A inserted between the low priority packets of multiple users is lost.

[0049] As shown in Fig. 6(c), frequency channel X transmits all of the low priority packets of multiple users and the high priority packets of user A. Also, as shown in Fig. 6(d), frequency channel Y transmits all of the low priority packets of multiple users and the high priority packets of user A.

[0050] Then, as shown in FIG. 6(e), in the redundant frequency channel Z, all of the low priority packets and the high priority packets of user A after the switching are transmitted.

[0051] In this way, the wireless communication system 1 according to an embodiment can switch an active frequency channel in which an abnormality (failure, etc.) has occurred to a redundant frequency channel while reducing user signal loss per user, as compared with a case in which one user occupies one frequency channel to transmit packets. Also, the wireless communication system 1 can reduce the number of discarded high-priority packets and improve the reliability of the communication line, as compared with a case in which one user occupies one frequency channel to transmit packets.

[0052] The wireless communication system 1 can also be applied to Ethernet (registered trademark) communication services for corporate users, and can reduce the influence of momentary interruptions that occur when switching routes when a relay wireless section fails. The wireless communication system 1 can also be applied to FWA (Fixed Wireless Access), satellite communication, wireless LAN, millimeter wave band communication, quasi-millimeter wave band communication, and mobile communication.

[0053] Next, frequency channel switching in the wireless communication system of the comparative example and user signals (packet arrangement) transmitted by each of the multiple frequency channels will be described. Fig. 7 is a diagram showing frequency channel switching in the wireless communication system of the comparative example and user signals (packet arrangement) transmitted by each of the multiple frequency channels.

[0054] Fig. 7(a) is a diagram showing a typical frequency channel switched by the wireless communication system of the comparative example. Fig. 7(b) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system of the comparative example on frequency channel W. Fig. 7(c) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system of the comparative example on frequency channel X. Fig. 7(d) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system of the comparative example on frequency channel Y. Fig. 7(e) is a diagram showing a typical user signal (packet arrangement) transmitted by the wireless communication system of the comparative example on frequency channel Z.

[0055] As shown in FIG. 7(a), in the wireless communication system of the comparative example, when a line disconnection occurs for one of the currently used frequency channels W, X, or Y (for example, frequency channel W) due to equipment failure, radio interference, or the like, the currently used frequency channel W is switched to the redundant frequency channel Z.

[0056] In the wireless communication system of the comparative example, user A occupies frequency channel W, user B occupies frequency channel X, and user C occupies frequency channel Y to transmit packets.

[0057] At this time, the wireless communication system of the comparative example discards user signals in frequency channel W at the switching time, as shown in Fig. 7(b). The high priority packets are, for example, the user signals of user A. The low priority packets are, for example, the user signals of users B and C. In other words, in frequency channel W, all high priority packets of user A are lost at the switching time.

[0058] As shown in Fig. 7(c), all low priority packets of user B are transmitted on frequency channel X. Also, as shown in Fig. 7(d), all low priority packets of user C are transmitted on frequency channel Y.

[0059] Then, as shown in FIG. 7(e), all of the high priority packets of user A after the switching are transmitted through redundant frequency channel Z.

[0060] As described above, in the wireless communication system of the comparative example, when a line disconnection occurs on frequency channel W, all high priority packets of user A may be lost during the switching time, which may result in a decrease in reliability of the communication line. [Explanation of symbols]

[0061] 1 wireless communication system, 2 transmitting device, 3 receiving device, 21 I / F section, 22 priority processing section, 23 frame processing section, 24 switching section, 25 modulation section, 26 RF section, 27 antenna, 28 monitoring and control section, 31 antenna, 32 RF section, 33 demodulation section, 34 switching section, 35 frame processing section, 36 priority processing section, 37 I / F section, 38 monitoring and control section, 230 division and allocation section, 232 arrangement processing section, 260 transmitting section, 262 receiving section, 320 receiving section, 322 transmitting section, 350 synthesis section

Claims

1. In a wireless communication system in which a plurality of user signals are transmitted from a transmitting device to a receiving device using a plurality of frequency channels including a working system and a redundant system, The transmitting device a division and allocation unit that divides each of a plurality of user signals into a number of frequency channels of an active system and allocates each of the divided user signals to each of the plurality of frequency channels of the active system; a transmission unit that transmits, to the receiving device, each of the plurality of user signals that have been allocated to each of the plurality of frequency channels of the working system by the division and allocation unit, for each of the plurality of frequency channels of the working system; a switching unit that switches the working frequency channel in which an abnormality has occurred to a redundant frequency channel when an abnormality has occurred in any of a plurality of working frequency channels through which the transmitting unit transmits each of a plurality of user signals; having The receiving device includes: a receiving unit that receives each of the plurality of user signals transmitted by the transmitting unit for each frequency channel; a synthesis unit that synthesizes each of a plurality of user signals received by the receiving unit for each frequency channel into a plurality of user signals for each user; A wireless communication system comprising:

2. The transmitting device The transmitter further comprises an arrangement processor for processing each of the signals transmitted by the transmitter for each frequency channel into a signal in which a high priority packet is arranged between low priority packets.

2. The wireless communication system according to claim 1,

3. The array processing unit includes: Sequencing of user signal categories or users into high priority packets 3. The wireless communication system according to claim 2,

4. A wireless communication method for transmitting a plurality of user signals using a plurality of frequency channels including a working system and a redundant system, a division and allocation step of dividing each of a plurality of user signals into a number of frequency channels of an active system and allocating each of the divided user signals to each of the plurality of frequency channels of the active system; a transmitting step of transmitting, for each of the plurality of frequency channels of the working system, the plurality of user signals allocated to the respective plurality of frequency channels of the working system; a switching step of switching the working frequency channel in which an abnormality has occurred to a redundant frequency channel when an abnormality has occurred in any of a plurality of working frequency channels that transmit a plurality of user signals, respectively; a receiving step of receiving each of the plurality of transmitted user signals for each frequency channel; a combining step of combining the plurality of user signals received for each frequency channel into a plurality of user signals for each user; 13. A wireless communication method comprising:

5. The method further includes an arrangement processing step of processing each signal transmitted for each frequency channel so that the signal is a signal in which a high priority packet is arranged between low priority packets.

5. The wireless communication method according to claim 4,

6. A transmitting device that transmits a plurality of user signals to a receiving device using a plurality of frequency channels including a working system and a redundant system, a division and allocation unit that divides each of a plurality of user signals into a number of frequency channels of an active system and allocates each of the divided user signals to each of the plurality of frequency channels of the active system; a transmission unit that transmits, to the receiving device, each of the plurality of user signals that have been allocated to each of the plurality of frequency channels of the working system by the division and allocation unit, for each of the plurality of frequency channels of the working system; a switching unit that switches the working frequency channel in which an abnormality has occurred to a redundant frequency channel when an abnormality has occurred in any of a plurality of working frequency channels through which the transmitting unit transmits each of a plurality of user signals; A transmitting device comprising:

7. The transmitter further comprises an arrangement processor for processing each of the signals transmitted by the transmitter for each frequency channel into a signal in which a high priority packet is arranged between low priority packets.

7. The transmitting device according to claim 6,

8. The array processing unit includes: Sequencing of user signal categories or users into high priority packets 8. The transmitting device according to claim 7,

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