CN114760611A - Unmanned aerial vehicle communication system and communication method - Google Patents

Unmanned aerial vehicle communication system and communication method Download PDF

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Publication number
CN114760611A
CN114760611A CN202111208419.2A CN202111208419A CN114760611A CN 114760611 A CN114760611 A CN 114760611A CN 202111208419 A CN202111208419 A CN 202111208419A CN 114760611 A CN114760611 A CN 114760611A
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China
Prior art keywords
communication link
different
aerial vehicle
unmanned aerial
frequency
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CN202111208419.2A
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Inventor
马骥超
赖慧谋
李马平
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Shenzhen Keweitai Enterprise Development Co ltd
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Shenzhen Keweitai Enterprise Development Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18502—Airborne stations
    • H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses an unmanned aerial vehicle communication system, which comprises an unmanned aerial vehicle end, a ground end, a communication link sending module and a communication link receiving module, wherein the communication link sending module is used for bearing TB on channel time-frequency resources according to a preset resource allocation scheme and sending the TB to the communication link receiving module; the communication link receiving module is used for distinguishing different TBs and different copies of the TBs, and screening according to 2 TB indication fields in the correctly received TBs to obtain effective data contained in the TBs. The invention bears the transmission block to be repeatedly transmitted on the redundant channel resource of the unmanned aerial vehicle communication link, obtains the effect of extra frequency diversity gain and/or time diversity gain by transmitting the copy of the same TB on the channel resource with different frequency and/or different time, makes up the adverse effect on the correct reception of signals due to the frequency selective fading and/or time selective fading characteristics of the wireless channel, and achieves the purpose of fully utilizing the available channel resource and improving the quality and reliability of link data transmission.

Description

Unmanned aerial vehicle communication system and communication method
Technical Field
The invention belongs to the technical field of unmanned aerial vehicle communication, and particularly relates to an unmanned aerial vehicle communication system and a communication method.
Background
Real-time data transmission needs to be carried out between an Unmanned Aerial Vehicle (UAV) and a ground terminal (a remote controller or a ground control station and the like), and along with the continuous abundance of unmanned aerial vehicle application scenes, higher and higher requirements are also provided for the effectiveness and reliability of real-time communication, the quality of an unmanned aerial vehicle communication link plays a crucial role therein, and the link contains two-way data communication: the unmanned aerial vehicle is used for receiving the uplink communication link of control instruction information sent by the ground terminal, and the ground terminal is used for receiving the downlink communication link of information such as real-time acquired data or shot images sent by the unmanned aerial vehicle;
current communication systems typically adapt the Modulation and Coding Scheme (MCS) adaptively to change the data bandwidth size of the system to match the average transmission rate of the available data over a period of time. By this method, the adaptation between the total data bandwidth and the effective data rate can be achieved to a certain extent, but it still cannot be guaranteed that all, or as much as possible, available channel resources are utilized, especially for the uplink, the amount of control command data is usually small, the utilization rate of the available channel resources is low, but the requirements on the quality and reliability of reception are usually high.
Therefore, the unmanned aerial vehicle communication system and the communication method are provided for solving the problems in the prior art, improving the reliability of controlling the unmanned aerial vehicle and reducing the risk of loss of connection.
Disclosure of Invention
The invention aims to provide an unmanned aerial vehicle communication system and a communication method, and aims to solve the problems that the utilization rate of available channel resources is low, but the requirements on the receiving quality and reliability are generally high in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: an unmanned aerial vehicle communication system comprises an unmanned aerial vehicle end, a ground end, a communication link sending module and a communication link receiving module, wherein the communication link sending module comprises an uplink communication link sending module and a downlink communication link sending module; the communication link receiving module comprises an uplink communication link receiving module and a downlink communication link receiving module; the uplink communication link sending module is in communication connection with the uplink communication link receiving module to establish an uplink communication link, and the downlink communication link sending module is in communication connection with the downlink communication link receiving module to establish a downlink communication link;
the ground end sends control instruction information to the unmanned aerial vehicle end through an uplink communication link;
the unmanned aerial vehicle end sends data collected in real time and shot image information to the ground end through a downlink communication link;
the communication link sending module is used for sending TB (transport block) carried on channel time-frequency resources to the communication link receiving module according to a preset resource allocation scheme;
the communication link receiving module is used for distinguishing different TBs and different copies of the TBs, and screening according to 2 TB indication fields in the correctly received TBs to obtain effective data contained in the TBs.
The invention also provides an unmanned aerial vehicle communication method, which comprises the following steps:
s1, the communication link sending module sends out TB bearing on the channel time frequency resource according to a preset resource allocation scheme, wherein the TB is the minimum unit of effective data division to be sent, one TB contains a fixed amount of effective data and occupies a fixed frequency domain length B and a fixed time domain length T on the time frequency resource;
s2, when finding that there is redundant available channel resource, the communication link sending module will select proper original TB to generate corresponding duplicate TB to bear on the channel resource, the duplicate TB and the corresponding original TB contain the same effective data, the more important the TB containing the effective data has higher priority, the more TB duplicates are allowed to be generated;
s3, in order to make the receiving end able to distinguish different TBs and different copies of the TB, 2 TB indication fields, F, are added to the TB1And F2In which F is1The field value is used to distinguish different TBs, F2The field values are used to distinguish different copies of the same TB.
Further, the valid data in S2 includes all types of data, of which the important is the control instruction data and the key information collection data.
Further, the number of identical TB copies in S3 cannot exceed a preset upper limit nmaxThe original TB and the duplicate TB are in the channel resource in the S3The temporal difference on the source has an upper limit Δ tmaxThe purpose of setting the upper limit value is to prevent aliasing between different TBs and to meet the requirement of reception real-time.
Further, in the S3, the relative positions of the original TB and the duplicate TB allocated on the available channel resources are different, and the allocation is divided into three types, i.e., a simultaneous different frequency, a different time same frequency, and a different time different frequency.
Further, the simultaneous pilot frequency allocates the original TB and the replica TB with the same time domain position and different frequency domain positions on the available channel resources.
Further, the different time-frequency channel allocates the original TB and the replica TB with different time-domain positions and the same frequency-domain position on the available channel resources.
Further, the different time and frequency frequencies are different in time domain position and frequency domain position allocated on available channel resources for the original TB and the replica TB.
Furthermore, the signal of the communication link sending module reaches the communication link receiving module through the wireless fading channel, due to the influence of system deviation and channel noise and interference, a part of TBs cannot be demodulated and received correctly, and the communication link receiving module performs screening according to 2 newly added fields in the correctly received TBs, that is, only one copy of valid data contained in the TB is reserved for the same TB, thereby avoiding the situation that the output valid data is duplicated.
Compared with the prior art, the invention has the following advantages: the invention bears the transmission block to be repeatedly transmitted on the redundant channel resource of the unmanned aerial vehicle communication link, obtains the effect of additional frequency diversity gain and/or time diversity gain by transmitting the copy of the same TB on the channel resource with different frequency and/or different time, makes up the adverse effect on the correct reception of signals due to the frequency selective fading and/or time selective fading characteristics of the wireless channel, achieves the purpose of fully utilizing the available channel resource to improve the quality and reliability of link data transmission, improves the reliability of controlling the unmanned aerial vehicle, and reduces the risk of loss of connection of the unmanned aerial vehicle.
Drawings
FIG. 1 is a diagram of the allocation of simultaneous pilot and pilot frequencies in the present invention;
FIG. 2 is a distribution diagram of different time and same frequency in the present invention;
FIG. 3 is a diagram of the distribution of different frequencies in different time periods according to the present invention;
FIG. 4 is a diagram of the original distribution TB distribution in example 1 of the present invention;
FIG. 5 is a TB distribution chart of simultaneous pilot frequency in example 1 of the present invention;
fig. 6 is a TB distribution diagram of different frequencies at different times in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The invention provides an unmanned aerial vehicle communication system which comprises an unmanned aerial vehicle end, a ground end, a communication link sending module and a communication link receiving module, wherein the communication link sending module comprises an uplink communication link sending module and a downlink communication link sending module; the communication link receiving module comprises an uplink communication link receiving module and a downlink communication link receiving module; the uplink communication link sending module is in communication connection with the uplink communication link receiving module to establish an uplink communication link, and the downlink communication link sending module is in communication connection with the downlink communication link receiving module to establish a downlink communication link;
the ground terminal sends control instruction information to the unmanned aerial vehicle terminal through an uplink communication link;
the unmanned aerial vehicle end sends data collected in real time and shot image information to the ground end through a downlink communication link;
the communication link sending module is used for sending TB (transport block) carried on channel time-frequency resources to the communication link receiving module according to a preset resource allocation scheme;
the communication link receiving module is used for distinguishing different TBs and different copies of the TBs, and screening according to 2 TB indication fields in the correctly received TBs to obtain effective data contained in the TBs.
In addition, the embodiment of the invention also provides an unmanned aerial vehicle communication method, which comprises the following steps:
s1, the communication link sending module sends out TB bearing on the channel time frequency resource according to a preset resource allocation scheme, wherein the TB is the minimum unit of effective data division to be sent, one TB contains a fixed amount of effective data and occupies a fixed frequency domain length B and a fixed time domain length T on the time frequency resource;
s2, when finding that redundant available channel resources exist, the communication link sending module selects a proper original TB to generate a corresponding copy TB to be loaded on the channel resources, the copy TB and the corresponding original TB contain the same effective data, the priority of the TB containing the more important effective data is higher, the number of the permitted generated TB copies is correspondingly more, the effective data comprises all types of data, and the more important is control instruction data and key information acquisition data;
s3, in order to enable a receiving end to distinguish different TBs and different copies of the TBs, 2 fields are added in the TBs, namely F1 and F2, wherein an F1 field value is used for distinguishing the different TBs, an F2 field value is used for distinguishing the different copies of the same TB, a time domain difference value of the original TB and the copy TB on channel resources has an upper limit value, and the upper limit value is set for preventing aliasing among the different TBs and meeting the requirement of receiving instantaneity;
as shown in fig. 1, fig. 1 is a distribution diagram of simultaneous and pilot frequencies in the present invention. The original TB and the copy TB are allocated on the available channel resources at the same time domain position and different frequency domain positions, and the frequency domain positions can be continuous or discontinuous.
As shown in fig. 2, fig. 2 is a distribution diagram of different time and same frequency in the present invention. The original TB and the copy TB are allocated on the available channel resources at different time domain positions and the same frequency domain position, the time domain positions can be continuous or discontinuous, the allocation method can obtain time diversity gain, and can obtain additional capability of resisting time selective fading.
As shown in fig. 3, fig. 3 is a distribution diagram of the inter-time and inter-frequency in the present invention. The original TB and the replica TB are allocated on different time domain positions and different frequency domain positions on the available channel resources, and the allocation method can simultaneously obtain time diversity gain and frequency diversity gain and can obtain additional capacity of resisting time selectivity and frequency selectivity fading.
When the number of copies is more than one, the relative positions of the original TB and the multiple copy TBs allocated on the available channel resources may be a combination of the above three types of manners.
The signal of the communication link sending module reaches the communication link receiving module through a wireless fading channel, due to the influence of system deviation and channel noise and interference, a part of TBs cannot be correctly demodulated and received, and the communication link receiving module screens 2 newly added fields in the correctly received TBs, namely, only one part of effective data contained in the TB is reserved for the same TB, so that the situation of repeated output effective data is avoided.
The frequency width of the available channel resources of the current unmanned aerial vehicle communication link is assumed to be 2B, and the time length is not limited. The distribution of the original TBs over the available channel resources is observed only for a short period of time as shown in fig. 4. Wherein TB1, TB2, and TB3 all contain different valid data. It can be found that the original TB occupies only half of the channel resources, the other half not carrying any useful data. In the case of resource allocation with simultaneous pilot frequency, the sending end will determine whether there is redundancy in the channel resources at a certain time, and if so, will generate a duplicate TB from the original TB at the same time, and bear the duplicate TB on the redundant channel resources at the same time, as shown in fig. 5. For example, TB1(0) is the original TB and TB1(1) is the corresponding copy TB. F of TB1(0) and TB1(1) in the 2 newly added fields of TB1Field values 1, F of TB2(0) and TB2(1)1Field value of 2, TB3(0) And F of TB3(1)1The field value is 3, and F of TB1(0), TB2(0) and TB3(0)2Field value is 0, F of TB1(1), TB2(1) and TB3(1)2The field value is 1, and the receiving end carries out effective data screening according to 2 newly added fields in the TB received correctly.
Example 2
In this embodiment, a resource allocation manner of different time and frequency is used for explanation, and it is assumed in the background of the communication link of the unmanned aerial vehicle as in embodiment 1 and fig. 4 that, when the resource allocation manner of different time and frequency is used, a sending end will determine whether a channel resource at a certain time has redundancy, if so, a copy TB will be generated from an original TB whose frequency position is different from that of a redundant channel resource at a previous time, and the copy TB is carried on the redundant channel resource at the current time, as shown in fig. 6, for example, TB1(0) is the original TB, TB1(1) is the corresponding copy TB, and among 2 newly added fields of the TB, TB1(0) and F1 (1)1Field values 1, F of TB2(0) and TB2(1)1Field values are 2, F for TB3(0) and TB3(1)1Field value is 3, and F of TB1(0), TB2(0) and TB3(0)2Field value is 0, F of TB1(1), TB2(1) and TB3(1)2The field value is 1, and the receiving end carries out effective data screening according to 2 newly added fields in the TB received correctly.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides an unmanned aerial vehicle communication system, includes unmanned aerial vehicle end, ground end, communication link send module and communication link receiving module, its characterized in that: the communication link sending module comprises an uplink communication link sending module and a downlink communication link sending module; the communication link receiving module comprises an uplink communication link receiving module and a downlink communication link receiving module; the uplink communication link sending module is in communication connection with the uplink communication link receiving module to establish an uplink communication link, and the downlink communication link sending module is in communication connection with the downlink communication link receiving module to establish a downlink communication link;
the ground end sends control instruction information to the unmanned aerial vehicle end through an uplink communication link;
the unmanned aerial vehicle end sends data collected in real time and shot image information to the ground end through a downlink communication link;
the communication link sending module is used for sending TB (transport block) carried on channel time-frequency resources to the communication link receiving module according to a preset resource allocation scheme;
the communication link receiving module is used for distinguishing different TBs and different copies of the TBs, and screening according to 2 TB indication fields in the correctly received TBs to obtain effective data contained in the TBs.
2. An unmanned aerial vehicle communication method is characterized in that: the method comprises the following steps:
s1, the communication link sending module sends out TB bearing on the channel time frequency resource according to a preset resource allocation scheme, wherein the TB is the minimum unit of effective data division to be sent, one TB contains a fixed amount of effective data and occupies a fixed frequency domain length B and a fixed time domain length T on the time frequency resource;
s2, when finding that there is redundant available channel resource, the communication link sending module will select proper original TB to generate corresponding duplicate TB to bear on the channel resource, the duplicate TB and the corresponding original TB contain the same effective data, the more important the TB containing the effective data has higher priority, the more TB duplicates are allowed to be generated;
s3, in order to make the receiving end able to distinguish different TBs and different copies of the TB, 2 TB indication fields, F, are added to the TB1And F2In which F1Field value for distinguishingDifferent TB, F2The field value is used to distinguish between different copies of the same TB.
3. The unmanned aerial vehicle communication method of claim 2, wherein: the valid data in S2 includes all types of data, of which the more important is control instruction data and key information acquisition data.
4. The unmanned aerial vehicle communication method of claim 2, wherein: the number of the same TB copies in the S3 cannot exceed a preset upper limit value nmaxIn the S3, the time domain difference value of the original TB and the replica TB on the channel resource has an upper limit value Δ tmaxThe purpose of setting the upper limit value is to prevent aliasing between different TBs and to meet the requirement of reception real-time.
5. The unmanned aerial vehicle communication method of claim 2, wherein: the relative positions of the original TB and the duplicate TB allocated on the available channel resources in S3 are different, and the positions are divided into three types, namely, simultaneous different frequency, different time same frequency, and different time different frequency.
6. The unmanned aerial vehicle communication method of claim 5, wherein: the simultaneous pilot frequency allocates the original TB and the replica TB with the same time domain position and different frequency domain positions on the available channel resources.
7. The unmanned aerial vehicle communication method of claim 5, wherein: the different time same frequency is different in time domain position and same in frequency domain position on available channel resources allocated to the original TB and the copy TB.
8. The unmanned aerial vehicle communication method of claim 5, wherein: the different time and frequency frequencies are different in time domain position and frequency domain position on available channel resources allocated to the original TB and the replica TB.
9. A method for communication of a drone according to claim 2, characterized in that: the signal of the communication link sending module reaches the communication link receiving module through a wireless fading channel, due to the influence of system deviation and channel noise and interference, a part of TBs cannot be demodulated and received correctly, and the communication link receiving module screens 2 newly added fields in the correctly received TBs, namely, only one part of effective data contained in the TB is reserved for the same TB, so that the situation that the output effective data is repeated is avoided.
CN202111208419.2A 2021-10-18 2021-10-18 Unmanned aerial vehicle communication system and communication method Pending CN114760611A (en)

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