Multi-class service transmission method of high-speed galloping wireless communication system

Abstract

The invention relates to the technical field of data transmission, and discloses a multi-class service transmission method for a high-speed galloping wireless communication system. The method comprises the following steps: dividing a wireless channel into M competition channels and N reservation channels; dividing the high-speed galloping service into ultra-short-time data, short-time data and long-time data; a sender monitors an idle channel and occupies a competitive channel to transmit ultra-short time data; the sender monitors an idle channel and occupies k competitive channels to transmit short-time data; and the sender reserves the idle channel and occupies the reserved channel to transmit the long-time data. Therefore, transmission conflicts during concurrence of multiple types of service data can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of data transmission, and in particular to a multi-type service transmission method of a high-speed flying car wireless communication system. Background Art

[0002] The high-speed flying car wireless communication system is the data transmission channel between the flying car and the ground. The safe operation of the flying car is inseparable from the reliable transmission of wireless communication. There are many types of flying car business data. The uplink (flying car → ground) business includes the status monitoring data of the on-board equipment, heartbeat information, control command response information, and on-board camera monitoring video feedback. The downlink (ground → flying car) business includes control instructions, heartbeat information, and flying car position and speed information. It can be seen that the uplink transmission rate is much higher than the downlink because of the monitoring video feedback.

[0003] The vehicle-to-ground wireless communication systems used in traditional rail transit (such as subways, high-speed railways, etc.) all have downlink service transmission rates that are much higher than uplink services. The downlink services that occupy more bandwidth are the PIS passenger information system, and the multimedia integrated information system for train operation information and public media information.

[0004] In wireless communications of public mobile networks (such as China Mobile and other operators), the downlink service transmission rate is much higher than the uplink rate, because many mobile terminals are within the coverage of the same base station, and the same base station serves the voice, multimedia and other needs of multiple mobile terminals.

[0005] Therefore, the wireless communication service characteristics of high-speed flying cars are quite different from those of traditional rail transit and public mobile networks. The transmission rate of uplink services is higher. Because uplink resources are limited, conflicts and interference between services are likely to occur during the transmission process, resulting in performance degradation. Summary of the invention

[0006] The invention provides a multi-class service transmission method for a high-speed flying car wireless communication system, which can solve the problems in the prior art.

[0007] The present invention provides a method for transmitting multiple types of services in a high-speed flying car wireless communication system, wherein the method comprises:

[0008] Divide the wireless channel into M contention channels and N reservation channels;

[0009] Divide high-speed flying car business into ultra-short-term data, short-term data and long-term data;

[0010] The sender listens to idle channels and occupies a contention channel to transmit ultra-short-term data;

[0011] The sender listens to idle channels and occupies k contention channels to transmit short-term data;

[0012] The sender reserves an idle channel and occupies the reserved channel to transmit long-duration data.

[0013] Preferably, the ultra-short-term data includes control instructions and control instruction response information, the short-term data includes status monitoring information, and the long-term data includes heartbeat information, vehicle-mounted camera monitoring video, and flying vehicle position and speed information.

[0014] Preferably, the sending party monitors an idle channel and occupies a contention channel to transmit ultra-short-time data, including:

[0015] The sender monitors the channel status, waits for a random time when the channel status is idle, and then monitors the channel status again. When the channel status is still idle, it occupies a contention channel to transmit ultra-short-term data to the receiver.

[0016] The sender receives a transmission confirmation frame ACK fed back by the receiver.

[0017] Preferably, the sender monitors idle channels and occupies k contention channels to transmit short-term data, including:

[0018] The sender sends a channel detection frame RTS to the receiver;

[0019] After receiving the access permission frame CTS fed back by the receiver, the sender occupies k contention channels to transmit short-term data to the receiver;

[0020] The sender receives a transmission confirmation frame ACK fed back by the receiver.

[0021] Preferably, the sending party reserving an idle channel and occupying the reserved channel to transmit long-duration data includes:

[0022] The sender sends a channel detection frame RTS to the receiver;

[0023] After receiving the access permission frame CTS fed back by the receiver, the sender occupies the reserved channel to transmit long-duration data to the receiver;

[0024] The sender receives the transmission confirmation frame ACK fed back by the receiver and confirms whether the data is transmitted correctly;

[0025] After confirming that the data is transmitted correctly, the sender transmits the long-duration data to the receiver again in the next cycle.

[0026] Preferably, for each long-duration data, three reserved channels are occupied for transmission.

[0027] Through the above technical solution, different frequency bands can be used to achieve simultaneous transmission of multiple wireless data channels while ensuring no conflicts, greatly improving channel utilization, thereby avoiding conflicts in transmission of multiple types of business data concurrently. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A flowchart of a method for transmitting multiple types of services in a high-speed flying car wireless communication system according to an embodiment of the present invention is shown;

[0030] Figure 2 A schematic diagram showing a contention channel and a reservation channel under FDMA according to an embodiment of the present invention is shown;

[0031] Figure 3 A schematic diagram of ultra-short-time data transmission according to an embodiment of the present invention is shown;

[0032] Figure 4 A schematic diagram of short-term data transmission according to an embodiment of the present invention is shown;

[0033] Figure 5 A schematic diagram of long-term data transmission according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] Figure 1 A flow chart of a method for transmitting multiple types of services in a high-speed flying car wireless communication system according to an embodiment of the present invention is shown.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a method for transmitting multiple types of services in a high-speed flying car wireless communication system, wherein the method comprises:

[0039] Divide the wireless channel into M contention channels and N reservation channels;

[0040] That is, based on FDMA, the wireless channel is divided into M frequency bands of contention channels and N frequency bands of reservation channels, such as Figure 2 shown.

[0041] Divide high-speed flying car business into ultra-short-term data, short-term data and long-term data;

[0042] The sender listens to idle channels and occupies a contention channel to transmit ultra-short-term data;

[0043] The sender listens to idle channels and occupies k contention channels to transmit short-term data;

[0044] The sender reserves an idle channel and occupies the reserved channel to transmit long-duration data.

[0045] Through the above technical solution, different frequency bands can be used to achieve simultaneous transmission of multiple wireless data channels while ensuring no conflicts, greatly improving channel utilization, thereby avoiding conflicts in transmission of multiple types of business data concurrently.

[0046] According to one embodiment of the present invention, ultra-short-term data includes control instructions and control instruction response information, short-term data includes status monitoring information, and long-term data includes heartbeat information, vehicle-mounted camera monitoring video, and flying vehicle position and speed information.

[0047] Among them, ultra-short-term data is bursty data and will not be sent in a long period; the duration of short-term data is between the duration of ultra-short-term data and the duration of long-term data; long-term data is data with a very long duration and transmitted in a long period.

[0048] According to an embodiment of the present invention, the sending party monitors an idle channel and occupies a contention channel to transmit ultra-short-time data, including:

[0049] The sender monitors the channel status, waits for a random time when the channel status is idle, and then monitors the channel status again. When the channel status is still idle, it occupies a contention channel to transmit ultra-short-term data to the receiver.

[0050] The sender receives a transmission confirmation frame ACK fed back by the receiver.

[0051] For example, for ultra-short-term data, for example, the sending node A (sender) sends a 100-bit data packet (DATA) with a duration of T to the sending node B (receiver), such as Figure 3 As shown in the figure, since the duration of the data packet is very short and the possibility of transmission conflict is small, it is possible to directly select and occupy a frequency in the contention channel as the carrier frequency f after detecting an idle channel. m After receiving the data packet, B will send A a confirmation frame ACK.

[0052] Taking ultra-short-term data including control instructions and control instruction response information as an example, the data duration is short and the possibility of conflict is small, so f can be directly selected. 1 , f 2 Compete for channel transmission.

[0053] According to an embodiment of the present invention, the sending party monitors idle channels and occupies k contention channels to transmit short-term data, including:

[0054] The sender sends a channel detection frame RTS to the receiver;

[0055] After receiving the access permission frame CTS fed back by the receiver, the sender occupies k contention channels to transmit short-term data to the receiver;

[0056] The sender receives a transmission confirmation frame ACK fed back by the receiver.

[0057] For example, for short-term data, such as a k×100-bit data packet (DATA) with a duration of kT, Figure 4As shown in the figure, since the data packet is long, even if the listening channel is idle, due to its long duration, the sending process may conflict with other data streams and interfere with each other. At this time, taking the sending node A (sender) sending data to the sending node B (receiver) as an example, A can first send a very small channel detection frame RTS to B. After B receives it, it sends an access permission frame CTS to A. After A receives it, it can consider that the channel is idle and obtain a carrier frequency of The bandwidth is f m -f m-k+1 At this time, A sends a k×100-bit data packet through the obtained contention channel. After receiving it, B will also feedback a transmission confirmation frame ACK to A. The whole process is in f m -f m-k+1 is performed on a contention channel.

[0058] Taking short-term data including status monitoring information as an example, when k devices fail and need to be uploaded, they are uploaded in f m-k+1 , f m-k+2 , ..., f m Equal k contention channels for transmission.

[0059] According to an embodiment of the present invention, the sending party reserving an idle channel and occupying the reserved channel to transmit long-duration data includes:

[0060] The sender sends a channel detection frame RTS to the receiver;

[0061] After receiving the access permission frame CTS fed back by the receiver, the sender occupies the reserved channel to transmit long-duration data to the receiver;

[0062] The sender receives the transmission confirmation frame ACK fed back by the receiver and confirms whether the data is transmitted correctly;

[0063] After confirming that the data is transmitted correctly, the sender transmits the long-duration data to the receiver again in the next cycle.

[0064] For example, for long-term data, such as two nodes continuously establishing a connection for a long time, such as Figure 5 As shown in the figure, the contention channel is no longer used at this time. A still sends a very small channel detection frame RTS to B to reserve an idle channel, such as Figure 2 As shown, we can obtain a frequency f n After receiving RTS, B sends an access permission frame CTS to A. After receiving CTS, A occupies the reserved channel and transmits at a carrier frequency of f. n After receiving the long data, B feeds back a transmission confirmation frame ACK to A. A receives the ACK frame, confirms that the data is transmitted correctly, and sends the data again in the next cycle.

[0065] According to an embodiment of the present invention, for each long-duration data, three reserved channels are occupied for transmission.

[0066] Taking long-term data including heartbeat information, vehicle camera monitoring video and flying car position and speed information as an example, each type of data occupies three reserved channels for transmission.

[0067] It can be seen from the above embodiments that the transmission method described in the present invention is suitable for the transmission of multiple types of business data packets such as high-speed vehicle control, status monitoring, and video. The transmission method described in the present invention can avoid transmission conflicts when multiple types of business data are transmitted concurrently.

[0068] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0070] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-service transmission method for a high-speed flying car wireless communication system, It is characterized in that The method comprises: dividing a wireless channel into M contention channels and N reservation channels; Divide high-speed flying car business into ultra-short-term data, short-term data and long-term data; The sender listens to idle channels and occupies a contention channel to transmit ultra-short-term data; The sender listens to idle channels and occupies k contention channels to transmit short-term data; The sender reserves an idle channel and occupies the reserved channel to transmit long-duration data.

2. The method according to claim 1, It is characterized in that Ultra-short-term data includes control instructions and control instruction response information, short-term data includes status monitoring information, and long-term data includes heartbeat information, vehicle-mounted camera monitoring video, and flying vehicle position and speed information.

3. The method according to claim 2, It is characterized in that The sender listens to the idle channel and occupies a contention channel to transmit ultra-short-term data including: The sender monitors the channel status, waits for a random time when the channel status is idle, and then monitors the channel status again. When the channel status is still idle, it occupies a contention channel to transmit ultra-short-term data to the receiver. The sender receives a transmission confirmation frame ACK fed back by the receiver.

4. The method according to claim 3, It is characterized in that The sender listens to idle channels and occupies k competing channels to transmit short-term data including: The sender sends a channel detection frame RTS to the receiver; After receiving the access permission frame CTS fed back by the receiver, the sender occupies k contention channels to transmit short-term data to the receiver; The sender receives a transmission confirmation frame ACK fed back by the receiver.

5. The method according to claim 4, It is characterized in that The sender reserves an idle channel and occupies the reserved channel to transmit long-duration data, including: The sender sends a channel detection frame RTS to the receiver; After receiving the access permission frame CTS fed back by the receiver, the sender occupies the reserved channel to transmit long-duration data to the receiver; The sender receives the transmission confirmation frame ACK fed back by the receiver and confirms whether the data is transmitted correctly; After confirming that the data is transmitted correctly, the sender transmits the long-duration data to the receiver again in the next cycle.

6. The method according to claim 5, It is characterized in that For each long-duration data, three reserved channels are occupied for transmission.

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