An on-demand access method for a drone communication system

Abstract

The present invention proposes a method for on-demand access to a drone communication system, including sensing the network metric values of drone terminal nodes and determining the access requirements of the current drone terminal according to the network metric values; wherein the access requirements include: capacity expansion type on-demand access, anti-interference type on-demand access, cross-domain type on-demand access; constructing a comprehensive metric value adapted to different access requirement modes; and selecting the optimal accessible point from the accessible set of the drone terminal according to the access requirements and the corresponding comprehensive metric values. The on-demand access method for the drone communication system proposed by the present invention adapts to various access requirements such as capacity expansion mode, anti-interference mode, cross-domain mode, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of unmanned aerial vehicle networking. Background Art

[0002] In recent years, forming an inter-aircraft cooperative communication network by taking advantage of the high flexibility and low cost of unmanned aerial vehicles (UAVs) has received great attention from countries around the world. As the basis of UAV cluster cooperation, UAV cooperative networking and high-reliability transmission technology is the core for realizing a series of tasks such as inter-aircraft control, situation sharing, massive information transmission and processing. However, UAV cooperative networking is quite different from traditional ad hoc networks, especially in that an efficient and intelligent channel access mechanism needs to be implemented at the MAC layer. Due to factors such as the capabilities of a single platform and the battery life, the traditional UAV channel access mechanism is difficult to adaptively adjust multiple access modes in real time and flexibly according to differentiated communication requirements, and thus cannot support tasks in complex environments. In addition, UAV networks in complex environments have characteristics such as multi-source information, complex transmission environments, and long distances between nodes, which also pose higher requirements for efficient and intelligent UAV access.

[0003] Based on the cooperative requirements of UAVs in complex adversarial environments, UAV networks need to have three basic modes for elastic construction of cooperative networks: an expansion mode, an anti-interference mode, and a cross-domain mode. The expansion mode is for large-capacity service scenarios, and addresses issues such as a large number of nodes in hot spots, diverse types of transmitted data, and large amounts of information, to support the requirements for UAV capacity enhancement; the anti-interference mode is for complex transmission scenarios, and addresses issues such as the easy failure of some links of UAV nodes and the network, and the easy interference of the used channels, to ensure the communication robustness and adaptability of key UAV nodes under complex electromagnetic interference; the cross-domain mode is for wide-area connection scenarios, and addresses issues such as the relatively far distribution of UAV transceiver nodes and the relatively concentrated distribution of other network nodes lacking cooperation, to support the cross-domain cooperation of long-distance UAVs. However, the characteristics of UAVs such as frequently joining and leaving the network and high-speed movement bring the following challenges to the flexible adjustment of the three on-demand access modes: First, the nodes in the UAV network move rapidly and unpredictably, the wireless channels are unstable and may be closed at any time due to intentional interference, and the dynamic environmental changes lead to rapid and drastic topological changes. How to timely obtain network metric information in a wide-area, highly dynamic complex environment, quickly judge the access requirements of UAV terminals, and then adaptively adjust the access points according to the requirements is a difficult problem that cannot be solved by traditional networks. Second, based on different scenarios, the differentiated service requirements pose higher demands on the network, and traditional single access methods cannot adapt to diverse service requirements. Therefore, how to design an efficient and intelligent on-demand access scheme, sense and judge the current communication requirements of UAV terminals, and adaptively switch to the optimal access point is crucial for whether the advantages of UAV cooperative networking can be fully utilized. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent.

[0005] To this end, the object of the present invention is to propose a method for on-demand access of an unmanned aerial vehicle (UAV) communication system, which is used to adapt to various access requirements such as expansion mode, anti-interference mode, and cross-domain mode.

[0006] To achieve the above object, an embodiment of the first aspect of the present invention proposes a method for on-demand access of an unmanned aerial vehicle communication system, including:

[0007] Perceiving the network metric values of the UAV terminal nodes, and determining the access requirements of the current UAV terminal according to the network metric values; wherein the access requirements include: expansion-type on-demand access, anti-interference-type on-demand access, and cross-domain-type on-demand access;

[0008] Constructing a comprehensive metric value under different access requirement modes;

[0009] Selecting the optimal accessible point from the accessible set of the UAV terminal according to the access requirements and the corresponding comprehensive metric values.

[0010] In addition, a method for on-demand access of an unmanned aerial vehicle communication system according to the above embodiment of the present invention may further have the following additional technical features:

[0011] Further, in an embodiment of the present invention, the perceiving the network metric values of the UAV terminal nodes includes:

[0012] Defining the retransmission threshold of the UAV terminal data packet as R, the signal-to-noise ratio threshold as K, the single-hop transmission distance as D, the actual retransmission times of the UAV terminal data packet as r, the signal-to-interference-plus-noise ratio of the channel where it is located as k, and the transmission distance to the destination node as d, then,

[0013]

[0014] Further, in an embodiment of the present invention, determining the access requirements of the current UAV terminal according to the network metric values includes:

[0015] Comparing the network metric values of the UAV terminal with the corresponding threshold R to respectively obtain the UAV terminal network metric measurement values ∈ r , ∈ k and ∈ d , where,

[0016]

[0017]

[0018]

[0019] Further, in an embodiment of the present invention, it further includes:

[0020] If ∈ k = 0, ∈ d = 0 and ∈ r = 1, then it is determined that the access requirement of the UAV terminal is expansion-type on-demand access;

[0021] If ∈ d = 0 and ∈ k = 1, then it is determined that the access requirement of the UAV terminal is anti-interference-type on-demand access;

[0022] If ∈ d = 1, then it is determined that the access requirement of the UAV terminal is cross-domain-type on-demand access.

[0023] Further, in an embodiment of the present invention, the constructed comprehensive metric value for different access requirement modes includes:

[0024]

[0025] Wherein, the bandwidth required by the UAV terminal is denoted as B r , the available channel bandwidth is denoted as B, the transmit power is denoted as P, and the received power is denoted as P r , the number of routing hops is denoted as hop, the total number of nodes in the network is denoted as nodenum, m1, m2, and m3 represent weight values, and m1 + m2 + m3 = 1.

[0026] Further, in an embodiment of the present invention, the selecting the optimal accessible point from the accessible set of the UAV terminal according to the access requirement and the comprehensive metric value corresponding to the access requirement includes:

[0027] Performing expansion-type on-demand access adjustment, performing anti-interference-type on-demand access adjustment, and performing cross-domain-type on-demand access adjustment.

[0028] Further, in an embodiment of the present invention, the performing expansion-type on-demand access adjustment includes:

[0029] Obtain the current set of accessible UAV base stations;

[0030] Calculate the capacity set of the link between the UAV terminal and the UAV base station to obtain the UAV terminal capacity requirement threshold;

[0031] Delete the nodes with capacity lower than the UAV terminal capacity requirement threshold from the set of accessible UAV base stations to obtain the set of accessible UAV base stations;

[0032] Obtain the signal strength and hop count from the UAV terminal to each UAV base station in the set of UAV base stations;

[0033] According to the construction of the comprehensive metric value, perform the weight adjustment for capacity expansion on-demand access, and calculate the comprehensive metric value from the UAV terminal to each UAV base station based on the signal strength and hop count, to obtain the set G of comprehensive metric values in the capacity expansion on-demand access mode c ;

[0034] Select the optimal access point l for anti-interference on-demand access c , as shown in the following formula:

[0035]

[0036] Furthermore, in an embodiment of the present invention, the performing of the anti-interference on-demand access adjustment includes:

[0037] Obtain the set of currently accessible UAV base stations and the corresponding available bandwidth set, the signal strength set from the UAV terminal to the accessible UAV base stations, and the hop count set from the UAV terminal to the accessible UAV base stations;

[0038] According to the construction of the comprehensive metric value, perform the weight adjustment for anti-interference on-demand access, and calculate the comprehensive metric value from the UAV terminal to each UAV base station based on the available bandwidth set, signal strength set, and hop count set, to obtain the set G of comprehensive metric values in the anti-interference on-demand access mode a ;

[0039] Select the optimal access point l for anti-interference on-demand access c , as shown in the following formula:

[0040]

[0041] Furthermore, in an embodiment of the present invention, the performing of the cross-domain on-demand access adjustment includes:

[0042] Obtain the set of currently accessible UAV base stations and the corresponding available bandwidth set, the signal strength set from the UAV terminal to the accessible UAV base stations, and the hop count set from the UAV terminal to the accessible UAV base stations;

[0043] According to the construction of the comprehensive metric value, perform the weight adjustment for cross-domain on-demand access, and calculate the comprehensive metric value from the UAV terminal to each UAV base station based on the available bandwidth set, signal strength set, and hop count set, to obtain the set G of comprehensive metric values in the cross-domain on-demand access mode d ;

[0044] Select the optimal access point l for cross-domain on-demand access c , as shown in the following formula:

[0045]

[0046] To achieve the above object, an on-demand access device for a drone communication system according to an embodiment of the second aspect of the present invention includes the following modules:

[0047] A judgment module, configured to sense the network metric value of the drone terminal node and determine the access requirement of the current drone terminal according to the network metric value; wherein the access requirement includes: capacity expansion type on-demand access, anti-interference type on-demand access, cross-domain type on-demand access;

[0048] A construction module, configured to construct a comprehensive metric value adapted to different access requirement modes;

[0049] An adjustment module, configured to select an optimal accessible point from the accessible set of the drone terminal according to the access requirement and the comprehensive metric value corresponding to the access requirement.

[0050] The on-demand access method for a drone communication system proposed in the embodiment of the present invention solves the problem that the traditional access method based on a single dimension of signal strength is difficult to adapt to the differentiated access requirements in the drone communication scenario. Compared with the prior art, it has the advantages of stronger flexibility, higher adaptability to complex scenarios, and easier implementation in engineering. Description of the Drawings

[0051] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0052] Figure 1 It is a schematic diagram of an on-demand access method for a drone communication system provided by an embodiment of the present invention.

[0053] Figure 2 It is a schematic diagram of capacity expansion type drone on-demand access adjustment provided by an embodiment of the present invention.

[0054] Figure 3 It is a schematic diagram of anti-interference type drone on-demand access adjustment provided by an embodiment of the present invention.

[0055] Figure 4 It is a schematic diagram of cross-domain type drone on-demand access adjustment provided by an embodiment of the present invention.

[0056] Figure 5 It is a flowchart of an on-demand access method for a drone communication system provided by an embodiment of the present invention.

[0057] Figure 6 It is a schematic diagram of an on-demand access device for a drone communication system provided by an embodiment of the present invention. Detailed Embodiments

[0058] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0059] The on-demand access method of the drone communication system according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0060] Figure 1 It is a schematic flow chart of an on-demand access method for a drone communication system provided by an embodiment of the present invention.

[0061] As Figure 1 shown, the on-demand access method of the drone communication system includes the following steps:

[0062] S1: Sense the network metric values of the drone terminal nodes, and determine the access requirements of the current drone terminal according to the network metric values; where the access requirements include: capacity expansion type on-demand access, anti-interference type on-demand access, cross-domain type on-demand access;

[0063] S101, obtain the network metric values. Assume that the retransmission threshold of the drone terminal data packet is R, the signal-to-noise ratio threshold is K, the single-hop transmission distance is D, the actual retransmission times of the drone terminal data packet is r, the signal-to-interference-plus-noise ratio of the channel where it is located is k, and the transmission distance to the destination node is d, where d is jointly determined by the transmission power P, the received power P r and the constant K.

[0064]

[0065] Further, in an embodiment of the present invention, sensing the network metric values of the drone terminal nodes includes:

[0066] Define the retransmission threshold of the drone terminal data packet as R, the signal-to-noise ratio threshold as K, the single-hop transmission distance as D, the actual retransmission times of the drone terminal data packet as r, the signal-to-interference-plus-noise ratio of the channel where it is located as k, and the transmission distance to the destination node as d, then,

[0067]

[0068] S102, compare the actual network metric values of the drone terminal with the corresponding thresholds to obtain the drone terminal network metric measurement values ∈ r , ∈ k and ∈ d .

[0069]

[0070]

[0071]

[0072] Further, in an embodiment of the present invention, determining the access requirement of the current UAV terminal according to the network metric value includes:

[0073] Comparing the network metric value of the UAV terminal with the corresponding threshold R to obtain the UAV terminal network metric measurement values ∈ r , ∈ k and ∈ d , where

[0074]

[0075]

[0076]

[0077] S103. Judging the access requirement of the current UAV terminal according to the network metric measurement value obtained in S102. If ∈ k = 0, ∈ d = 0 and ∈ r = 1, it is determined that the access requirement of the current UAV terminal is expansion type on-demand access, and step S310 is entered; if ∈ d = 0 and ∈ k = 1, it is determined that the access requirement of the current UAV terminal is anti-interference type on-demand access, and step S320 is entered; if ∈ d = 1, it is determined that the access requirement of the current UAV terminal is cross-domain type on-demand access, and step S330 is entered.

[0078] Further, in an embodiment of the present invention, it further includes:

[0079] If ∈ k = 0, ∈ d = 0 and ∈ r = 1, it is determined that the access requirement of the UAV terminal is expansion type on-demand access;

[0080] If ∈ d = 0 and ∈ k = 1, it is determined that the access requirement of the UAV terminal is anti-interference type on-demand access;

[0081] If ∈ d = 1, it is determined that the access requirement of the UAV terminal is cross-domain type on-demand access.

[0082] S2: Construct a comprehensive measurement value suitable for different access requirement modes;

[0083] S201. In the capacity-expansion on-demand access, the UAV terminal needs to switch to an access point that meets the UAV capacity requirement. Therefore, the channel bandwidth is used as the main consideration index for the capacity-expansion mode. Among them, the bandwidth required by the UAV terminal is denoted as B r , and the available channel bandwidth is denoted as B; in the anti-interference on-demand access, the UAV terminal needs to select an access point with a higher received signal strength from the set of accessible UAV base stations for access. Therefore, the received signal strength is used as the main consideration index for the anti-interference mode. Among them, the transmit power is denoted as P, and the received power is denoted as P r ; in the cross-domain on-demand access, the UAV terminal needs to transmit the message to the destination node as soon as possible. Therefore, the routing hop count is used as the main consideration index for the cross-domain mode. Among them, the hop count is denoted as hop, the total number of nodes in the network is denoted as nodenum, m1, m2, and m3 represent weights, and m1 + m2 + m3 = 1. For the above three indexes, a comprehensive metric value G suitable for different access demand modes is designed.

[0084]

[0085] Furthermore, in an embodiment of the present invention, a comprehensive metric value adapted to different access demand modes is constructed, including:

[0086]

[0087] Among them, the bandwidth required by the UAV terminal is denoted as B r , the available channel bandwidth is denoted as B, the transmit power is denoted as P, and the received power is denoted as P r , the routing hop count is denoted as hop, the total number of nodes in the network is denoted as nodenum, m1, m2, and m3 represent weights, and m1 + m2 + m3 = 1.

[0088] S202. By obtaining the information of each part of the metric value and adjusting the weights, and combining other characteristic information under different on-demand access modes, select the point l with the minimum G value from the set of optional access points as the access point.

[0089]

[0090] S3: Select the optimal accessible point from the accessible set of the UAV terminal according to the access demand and the corresponding comprehensive metric value of the access demand.

[0091] Furthermore, in an embodiment of the present invention, selecting the optimal accessible point from the accessible set of the UAV terminal according to the access demand and the corresponding comprehensive metric value of the access demand includes:

[0092] Perform capacity expansion type on-demand access adjustment, perform anti-interference type on-demand access adjustment, and perform cross-domain type on-demand access adjustment.

[0093] S310: Perform capacity expansion type on-demand access adjustment, as Figure 2 shown.

[0094] S311. Obtain the set of currently accessible UAV base stations, and measure the available bandwidth and signal-to-noise ratio of the UAV terminal to each base station. Let the set of accessible UAV base stations be M = {m0, m1, m2 ， …, m n-1}, the set of available bandwidths of accessible UAV base stations be B = {b0, b1, b2,..., b n-1}, and the set of channel signal-to-noise ratios between the UAV terminal and the UAV base stations be S = {s0, s1, s2,..., s n-1}.

[0095] S312. Calculate the set of capacities C = {c0, c1, c2,..., c n-1} of the links between the UAV terminal and the UAV base stations.

[0096] C i = b i log2(1 + s i ) #(7)

[0097] S313. Delete the nodes with capacities lower than the capacity requirement threshold C r from the set of accessible UAV base stations to obtain the set of accessible UAV base stations M r .

[0098] S314. Obtain the signal strength and hop count of the UAV terminal to each UAV base station in the set M r . Let the set of hop counts of the UAV terminal to the accessible UAV base stations be H = {h0, h1, h2,..., h n}, and the set of received signal strengths of the UAV terminal to the accessible UAV base stations be P r = {p0, p1, p2,..., p n}. The received signal strength p i is jointly determined by the transmit power P, the distance d between the transmitting and receiving nodes, and the constant K, and can be obtained according to the distance expression obtained in S101.

[0099]

[0100] S315. According to the construction of the comprehensive metric value in S201, in capacity expansion type on-demand access, the values of m1, m2, and m3 are 0.6, 0.2, and 0.2 respectively, and calculate the comprehensive metric value g of the UAV terminal to each UAV base stationi and obtain the set G of comprehensive metric values in the expanded on-demand access mode c ={g0, g1, g2, ..., g n}.

[0101]

[0102] S316. Select the optimal access point l under the expanded on-demand access according to S202 c。

[0103]

[0104] Furthermore, in an embodiment of the present invention, the expanded on-demand access adjustment is performed, including:

[0105] Obtain the set of currently accessible drone base stations;

[0106] Calculate the set of capacities of the links between the drone terminals and the drone base stations to obtain the capacity requirement threshold of the drone terminals;

[0107] Delete the nodes with capacities lower than the capacity requirement threshold of the drone terminals from the set of accessible drone base stations to obtain the set of accessible drone base stations;

[0108] Obtain the signal strength and hop count from the drone terminal to each drone base station in the set of accessible drone base stations;

[0109] According to the construction of the comprehensive metric value, perform the weight adjustment of the expanded on-demand access, and calculate the comprehensive metric value from the drone terminal to each drone base station according to the signal strength and hop count to obtain the set G of comprehensive metric values in the expanded on-demand access mode c ;

[0110] Select the optimal access point l under the anti-interference on-demand access c , as shown in the following formula:

[0111]

[0112] S320: Perform the anti-interference on-demand access adjustment, as Figure 3 shown.

[0113] S321. Obtain the set of currently accessible drone base stations and the corresponding available bandwidth set, the signal strength set from the drone terminal to the accessible drone base stations, and the hop count set from the drone terminal to the accessible drone base stations. Let the set composed of the accessible drone base stations be M = {m0, m1, m2, …, m n-1}, and the available bandwidth set of the accessible drone base stations be B = {b0, b1, b2, ..., b n-1}。The set of received signal strengths from the UAV terminals to the accessible UAV base stations is P r ={p0, p1, p2,..., p n}, and the set of hop counts from the UAV terminals to the accessible UAV base stations is H = {h0, h1, h2,..., h n}.

[0114] S322. According to the construction of the comprehensive metric value in S201, in the expanded on-demand access, the values of m1, m2, and m3 are taken as 0.2, 0.6, and 0.2 respectively, and calculate the comprehensive metric value g of each UAV terminal to each UAV base station i , and obtain the set of comprehensive metric values G a ={g0, g1, g2,..., g n} in the anti-interference on-demand access mode.

[0115]

[0116] S323. Select the optimal access point l c .

[0117]

[0118] Furthermore, in an embodiment of the present invention, the anti-interference on-demand access adjustment includes:

[0119] Obtain the current set of accessible UAV base stations and the corresponding available bandwidth sets, the set of signal strengths from the UAV terminals to the accessible UAV base stations, and the set of hop counts from the UAV terminals to the accessible UAV base stations;

[0120] According to the construction of the comprehensive metric value, perform anti-interference on-demand access weight adjustment, and calculate the comprehensive metric value of each UAV terminal to each UAV base station according to the available bandwidth set, signal strength set, and hop count set, and obtain the set of comprehensive metric values G a ;

[0121] Select the optimal access point l c in the anti-interference on-demand access, as shown in the following formula:

[0122]

[0123] S330: Perform cross-domain on-demand access adjustment, as Figure 4 shown.

[0124] S331. Obtain the set of currently accessible UAV base stations and the corresponding available bandwidth sets, the signal strength sets from the UAV terminals to the accessible UAV base stations, and the hop count sets from the UAV terminals to the accessible UAV base stations. Let the set composed of the accessible UAV base stations be M = {m0, m1, m2, …, m n-1}, and the set of available bandwidths of the accessible UAV base stations be B = {b0, b1, b2, ..., b n-1}. The received signal strength set from the UAV terminals to the accessible UAV base stations is P r = {p0, p1, p2, ..., p n}, and the hop count set from the UAV terminals to the accessible UAV base stations is H = {h0, h1, h2, ..., h n}.

[0125] S332. According to the construction of the comprehensive metric value in S201, in cross - domain on - demand access, the values of m1, m2, and m3 are taken as 0.2, 0.2, and 0.6 respectively, calculate the comprehensive metric value g i from the UAV terminal to each UAV base station, and obtain the set G d of comprehensive metric values in the cross - domain on - demand access mode, G = {g0, g1, g2, ..., g n}.

[0126]

[0127] S333. Select the optimal access point l c under cross - domain on - demand access according to S202.

[0128]

[0129] Furthermore, in an embodiment of the present invention, the cross - domain on - demand access adjustment includes:

[0130] Obtain the set of currently accessible UAV base stations and the corresponding available bandwidth sets, the signal strength sets from the UAV terminals to the accessible UAV base stations, and the hop count sets from the UAV terminals to the accessible UAV base stations;

[0131] According to the construction of the comprehensive metric value, perform cross - domain on - demand access weight adjustment, and calculate the comprehensive metric value from the UAV terminal to each UAV base station according to the available bandwidth set, signal strength set, and hop count set, to obtain the set G d of comprehensive metric values in the cross - domain on - demand access mode;

[0132] Select the optimal access point l c under cross - domain on - demand access, as shown in the following formula:

[0133]

[0134] The above is the process flow of the on-demand access method for the complete UAV communication system. Figure 5 It is a schematic diagram of the technical route of the present invention.

[0135] The on-demand access method for the UAV communication system proposed in the embodiment of the present invention solves the problem that the traditional single access mode cannot adapt to the different terminal requirements in the UAV communication network by designing an access requirement judgment mechanism and constructing a comprehensive metric. In different access modes, the UAV terminal can set different consideration index weights according to different requirements, and construct a comprehensive metric index, and select the most suitable access point from the set of accessible points according to this comprehensive metric to meet the different access requirements of the UAV terminal. Compared with the prior art, the present invention has the advantages of stronger flexibility, higher adaptability to complex scenarios and being easy to implement in engineering.

[0136] To implement the above embodiment, the present invention also proposes an on-demand access device for a UAV communication system.

[0137] Figure 6 It is a schematic structural diagram of an on-demand access device for a UAV communication system provided by an embodiment of the present invention.

[0138] As Figure 6 shown, the on-demand access device for the UAV communication system includes: a judgment module 100, a construction module 200, and an adjustment module 300, wherein,

[0139] The judgment module is used to sense the network metric values of the UAV terminal nodes, and determine the access requirements of the current UAV terminal according to the network metric values; the access requirements include: capacity expansion type on-demand access, anti-interference type on-demand access, cross-domain type on-demand access;

[0140] The construction module is used to construct a comprehensive metric value suitable for different access requirement modes.

[0141] The adjustment module is used to select the optimal accessible point from the accessible set of the UAV terminal according to the access requirements and the comprehensive metric value corresponding to the access requirements.

[0142] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0143] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0144] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for on-demand access of an unmanned aerial vehicle communication system, characterized in that Including the following steps: Perceive the network metric values of the UAV terminal nodes, and determine the access requirements of the current UAV terminal according to the network metric values; Wherein the access requirements include: expansion type on-demand access, anti-interference type on-demand access, cross-domain type on-demand access; Construct a comprehensive metric value suitable for different access requirement modes; According to the access requirements and the comprehensive metric value corresponding to the access requirements, select the optimal access point from the accessible set of the UAV terminal; Wherein, the perceiving the network metric values of the UAV terminal nodes includes: Define the retransmission threshold of the UAV terminal data packet as R, the signal-to-noise ratio threshold as K, the single-hop transmission distance as D, the actual retransmission times of the UAV terminal data packet as r, the signal-to-interference-plus-noise ratio of the channel where it is located as k, and the transmission distance to the destination node as d, then, ； Determining the access requirements of the current UAV terminal according to the network metric values includes: Compare the network metric values of the drone terminal with the corresponding thresholds to obtain the drone terminal network metric measurement values respectively , and , where ， ， ； It also includes: If , and , it is determined that the access requirement of the UAV terminal is an expansion type on-demand access; If and , it is determined that the access requirement of the UAV terminal is anti-interference on-demand access; If , it is determined that the access requirement of the UAV terminal is cross-domain on-demand access The constructing a comprehensive metric value suitable for different access requirement modes includes: ， Among them, the bandwidth required by the UAV terminal is expressed as , the available channel bandwidth is expressed as B, the transmit power is expressed as P, and the received power is expressed as P r , the number of routing hops is expressed as hop, the total number of nodes in the network is expressed as nodenum, m1, m2, and m3 represent weights, and m1 + m2 + m3 = 1; The method also includes: By obtaining each part of information of the metric value and adjusting the weights, and combining other characteristic information under different on-demand access modes, select the point with the minimum G value from the set of optional access points as the access point: 。 2. The method according to claim 1, characterized in that, The selecting the optimal access point from the accessible set of the UAV terminal according to the access requirements and the comprehensive metric value corresponding to the access requirements includes: Perform expansion type on-demand access adjustment, perform anti-interference type on-demand access adjustment, perform cross-domain type on-demand access adjustment.

3. According to the method described in claim 1 or 2, the performing expansion type on-demand access adjustment includes: Obtain the current accessible UAV base station set; Calculate the capacity set of the link between the UAV terminal and the UAV base station to obtain the UAV terminal capacity requirement threshold; Delete the nodes with capacity lower than the UAV terminal capacity requirement threshold from the accessible UAV base station set to obtain the accessible UAV base station set; Obtain the signal strength and hop count from the UAV terminal to each UAV base station in the UAV base station set; According to the construction of the comprehensive metric value, perform expansion-type on-demand access weight adjustment, and calculate the comprehensive metric value of the UAV terminal to each UAV base station according to the signal strength and hop count, so as to obtain the set of comprehensive metric values in the expansion-type on-demand access mode ; Select the optimal access point under expansion type on-demand access , as shown in the following formula: 。 4. According to the method described in claim 1 or 2, the performing anti-interference type on-demand access adjustment includes: Obtain the current accessible UAV base station set and the corresponding available bandwidth set, the signal strength set from the UAV terminal to the accessible UAV base stations, and the hop count set from the UAV terminal to the accessible UAV base stations; According to the construction of the comprehensive metric value, anti-interference on-demand access weight adjustment is performed, and according to the available bandwidth set, signal strength set, and hop count set, the comprehensive metric value from the UAV terminal to each UAV base station is calculated to obtain the comprehensive metric value set in the anti-interference on-demand access mode ; Select the optimal access point under anti-interference type on-demand access , as shown in the following formula: 。 5. According to the method described in claim 1 or 2, the performing cross-domain type on-demand access adjustment includes: Obtain the current accessible UAV base station set and the corresponding available bandwidth set, the signal strength set from the UAV terminal to the accessible UAV base stations, and the hop count set from the UAV terminal to the accessible UAV base stations; According to the construction of the comprehensive metric value, cross-domain on-demand access weight adjustment is performed, and according to the available bandwidth set, signal strength set, and hop count set, the comprehensive metric value from the UAV terminal to each UAV base station is calculated to obtain the comprehensive metric value set in the cross-domain on-demand access mode ; Select the optimal access point under cross-domain on-demand access , as shown in the following formula: 。 6. An on-demand access device for a drone communication system, characterized in that, Including the following modules: A judgment module, used to perceive the network metric values of the UAV terminal nodes, and determine the access requirements of the current UAV terminal according to the network metric values; Wherein the access requirements include: expansion type on-demand access, anti-interference type on-demand access, cross-domain type on-demand access; A construction module, used to construct a comprehensive metric value suitable for different access requirement modes; An adjustment module, used to select the optimal access point from the accessible set of the UAV terminal according to the access requirements and the comprehensive metric value corresponding to the access requirements; Wherein, the perceiving the network metric values of the UAV terminal nodes includes: Define the retransmission threshold of the drone terminal data packet as R, the signal-to-noise ratio threshold as K, the single-hop transmission distance as D, the actual retransmission times of the drone terminal data packet as r, the signal-to-interference ratio of the channel where it is located as k, and the transmission distance to the destination node as d. Then, ； Determine the access requirements of the current drone terminal according to the network metric values, including: Compare the network metric values of the UAV terminal with the corresponding thresholds to obtain the UAV terminal network metric measurement values respectively , and , where ， ， ； It also includes: If , and , it is determined that the access requirement of the UAV terminal is an expansion type on-demand access; If and , it is determined that the access requirement of the UAV terminal is anti-interference on-demand access; If , it is determined that the access requirement of the UAV terminal is cross-domain on-demand access The constructed comprehensive metric values for different access requirement modes include: ， Among them, the bandwidth required by the UAV terminal is expressed as , the available channel bandwidth is expressed as B, the transmit power is expressed as P, and the received power is expressed as P r , the number of routing hops is expressed as hop, the total number of nodes in the network is expressed as nodenum, m1, m2, and m3 represent weights, and m1 + m2 + m3 = 1; The adjustment module is specifically used for: By obtaining each part of information of the metric value and adjusting the weights, and combining with other characteristic information under different on-demand access modes, select the point with the minimum G value from the set of optional access points as the access point: 。

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