CN109361448A - A kind of vacant lot wireless communications method and its system towards Air communication platform - Google Patents

A kind of vacant lot wireless communications method and its system towards Air communication platform Download PDF

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Publication number
CN109361448A
CN109361448A CN201811163495.4A CN201811163495A CN109361448A CN 109361448 A CN109361448 A CN 109361448A CN 201811163495 A CN201811163495 A CN 201811163495A CN 109361448 A CN109361448 A CN 109361448A
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China
Prior art keywords
air communication
ground
communication platform
frame
terminal
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CN201811163495.4A
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Chinese (zh)
Inventor
易辉跃
张武雄
许晖
梁广
孙思月
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Fuzhou Internet Of Things Open Laboratory Co Ltd
Shanghai Research Center for Wireless Communications
Shanghai Engineering Center for Microsatellites
Original Assignee
Fuzhou Internet Of Things Open Laboratory Co Ltd
Shanghai Research Center for Wireless Communications
Shanghai Engineering Center for Microsatellites
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Application filed by Fuzhou Internet Of Things Open Laboratory Co Ltd, Shanghai Research Center for Wireless Communications, Shanghai Engineering Center for Microsatellites filed Critical Fuzhou Internet Of Things Open Laboratory Co Ltd
Priority to CN201811163495.4A priority Critical patent/CN109361448A/en
Publication of CN109361448A publication Critical patent/CN109361448A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/18502Airborne stations
    • H04B7/18506Communications with or from aircraft, i.e. aeronautical mobile service
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/382Monitoring; Testing of propagation channels for resource allocation, admission control or handover
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/185Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851Systems using a satellite or space-based relay
    • H04B7/18517Transmission equipment in earth stations

Abstract

The invention discloses a kind of vacant lot wireless communications method and its system towards Air communication platform.This method comprises the following steps: step 1: Air communication platform obtains uplink communication links preferred channel collection;Step 2: ground based terminal obtains the right to use of down channel by periodically sending deception frame;Step 3: terminal sends broadcast message to Air communication platform to the ground;Step 4: ground based terminal sends access request frame on the preferred channel of uplink communication links, to Air communication platform;Step 5: terminal sends access request response frame to Air communication platform to the ground, establishes Ground-to-air Communication Link.The present invention solves the problems, such as the spectrum shortage that vacant lot wireless communication system generally faces, improves the availability of frequency spectrum by making full use of the idle frequency spectrum of ISM band.

Description

A kind of vacant lot wireless communications method and its system towards Air communication platform
Technical field
The present invention relates to a kind of vacant lot wireless communications method towards Air communication platform is also related to using this method Vacant lot wireless communication system, belong to vacant lot wireless communication technology field.
Background technique
Air communication platform, which refers to, to be mounted on unmanned plane, stratospheric airship, satellite for wireless relay apparatus and is tethered at gas On the aircrafts such as ball, realize that " air-air ", " Air-Ground " be a wide range of or some areas in radio communication service communication infrastructure platform. Currently, assigning the more application scenarios of Air communication platform, mainly with the continuous promotion of 4G/5G and Internet of Things (IoT) technology It is embodied in two o'clock: first is that aerial Internet of Things is constructed, second is that establishing air base station.For example, Google company is utilizing aerial lead to Letter platform makes space-air-ground integration Internet of Things.Verizon company utilizes the small base station of UAV flight, provides aerial wireless network Network covering service.
In order to meet the use demand of aerial Internet of Things, Air communication platform should be able to be with ground based terminal, IoT node and nothing Line sensor node is communicated.Therefore, Air communication platform needs to establish reliable and stable wireless communication link with ground based terminal Road carries out information transmission between each other.But in the prior art, the communication between Air communication platform and ground is not fixed Frequency spectrum resource.In practical application, the working frequency of Air communication platform and ground based terminal generallys use ISM band (Industrial Scientific Medical Band): 2.4GHz or 5.8GHz.Since these frequency ranges are non-authorized spectrum bands, Therefore it is interfered present in these frequency ranges relatively more.Micro-wave oven on regular traffic such as WLAN, Bluetooth or even ground Use may all generate interference to Air communication platform, reduce communication and the command range of Air communication platform, or reduce The sensitivity of receiver.
Yang Wang is in paper " Cognitive Radio for aeronautical air-ground Communications " (it is published in IEEE Aerospace and Electronic Systems Magazine, 2010, Vol.25, no.5, pp.18-23) in, it proposes using cognitive radio (Cognitive Radio) technology and solves to lead in the air Believe the spectrum issue of platform.Environment around the perception of cognition wireless electric energy allows communication system to make optimal determine according to environment Plan adaptively configures its messaging parameter (frequency, modulation and coding, transmission power etc.).Cognitive radio is obtained by perception Environmental data of Air communication platform, such as position of aircraft, busy channel etc..It is also possible to obtain near ground based terminal Channel allocation information.According to information obtained, cognitive radio can determine which channel can be used, and construct optimal Solution.
Summary of the invention
In view of the deficiencies of the prior art, primary technical problem to be solved by this invention is to provide a kind of towards aerial logical Believe the vacant lot wireless communications method of platform.
Another technical problem to be solved by this invention is to provide a kind of vacant lot wireless communication system using the above method System.
For achieving the above object, the present invention uses following technical solutions:
According to a first aspect of the embodiments of the present invention, a kind of vacant lot side wireless communication towards Air communication platform is provided Method includes the following steps:
Step 1: Air communication platform obtains uplink communication links preferred channel collection;
Step 2: ground based terminal obtains the right to use of down channel by periodically sending deception frame;
Step 3: the Air communication platform sends broadcast message to the ground based terminal;
Step 4: the ground based terminal connects on the preferred channel of uplink communication links to Air communication platform transmission Enter claim frame;
Step 5: the Air communication platform sends access request response frame to the ground based terminal, establishes air-ground dialogue chain Road.
Wherein more preferably, in the step 3, the Air communication platform sends broadcast in a manner of repeating to send broadcast frame Information.
Wherein more preferably, the time span T of the broadcast frame0Meet following condition:
2T0+Ws<Ts, T0+2Ws<Ts
Wherein, TsFor the sending cycle of the deception frame, WsFor the time span of the deception frame.
Wherein more preferably, in the step 4, the Air communication platform obtains the time of reception of access request frame first, Then according to the claim frame sending instant carried in the access request frame, estimate the transmission of ground based terminal to Air communication platform Time delay.
Wherein more preferably, in the step 4, the Air communication platform is according to the biography of Air communication platform to ground based terminal The initial time of defeated time delay and first idle period determines emission time initial lead and sending time length Δ TU
Wherein more preferably, in the step 5, the Air communication platform is on downlink pilot frequency channel with the launch time Lead sends access request response frame.
Wherein more preferably, in the access request response frame, frame length=sending time length Δ TUSignal time slot+nothing Signal blank interval;Wherein, in no signal blank interval, the ground based terminal does not receive signal.
Wherein more preferably, in the step 1, the Air communication platform utilizes broader frequency spectrum cognition technology detection ISM frequency Clear channel in section, the idle channel that will test sorts from small to large by mean power spectral intensity, and by power spectral intensity The smallest top n idle channel is as the uplink communication links preferred channel collection;Wherein, N is positive integer.
According to a second aspect of the embodiments of the present invention, a kind of vacant lot wireless communication system towards Air communication platform is provided System, including Air communication platform and ground based terminal, in which:
Above-mentioned vacant lot wireless communications method carries out air-ground dialogue between the Air communication platform and the ground based terminal.
Wherein more preferably, the Air communication platform is the unmanned plane for being equipped with wireless relay apparatus, stratospheric airship, defends Star or captive balloon.
Compared with prior art, for the present invention in the uplink communication links of vacant lot wireless communication system, air communication is flat Platform obtains the preferred channel of uplink communication links, and pass through using the idle frequency spectrum of broader frequency spectrum cognition technology perception ISM band Fixed downlink pilot frequency channel notifies ground based terminal.In the downstream communications link of vacant lot wireless communication system, ground based terminal benefit It attacks to obtain the channel resource of downstream communications link with frequency spectrum perception or deception formula.Moreover, by the information exchange between vacant lot, Establish the communication linkage between vacant lot.The present invention solves vacant lot channel radio by making full use of the idle frequency spectrum of ISM band The spectrum shortage problem that letter system generally faces, effectively increases the availability of frequency spectrum.
Detailed description of the invention
Fig. 1 is the overall structure diagram of vacant lot wireless communication system in one embodiment of the present of invention;
Fig. 2 is to cheat the timing diagram of frame in one embodiment of the present of invention;
Fig. 3 is the timing diagram that Air communication platform sends signal and ground based terminal receives signal
Fig. 4 is in downstream communications link, and broadcast message sends and receives timing diagram;Wherein, (a) is the timing for cheating frame Figure;(b) schematic diagram of transmission broadcast frame is repeated for Air communication platform;It (c) is the broadcast frames reception schematic diagram of ground based terminal.
Specific embodiment
Detailed specific description is unfolded to technology contents of the invention in the following with reference to the drawings and specific embodiments.
Present invention firstly provides a kind of vacant lot wireless communications method towards Air communication platform.This method includes following several The technology contents of aspect: (1) acquisition of frequency spectrum resource: in uplink communication links, Air communication platform utilizes broader frequency spectrum sense Know technology, obtains the idle frequency spectrum in ISM band, and as uplink communication links preferred channel.In downstream communications link In, ground based terminal cheats the pilot channel and Traffic Channel that formula attack obtains downstream communications link by frequency spectrum perception or Sybil; (2) Air communication platform by repeat send broadcast frame to the ground terminal send broadcast message, enable ground based terminal just Broadcast message is really received, and obtains the information of uplink communication links preferred channel, while estimating Air communication platform to ground The propagation delay time of terminal;(3) ground based terminal sends access request to Air communication platform on uplink communication links preferred channel Frame, wherein idle mode (comprising idling cycle, idle period comprising downstream communications link pilot channel and Traffic Channel Only moment etc.);(4) Air communication platform determines emission time initial lead and hair according to the access request frame information of ground based terminal Frame structure is sent, ground based terminal is enabled to be properly received the downstream communications link information from Air communication platform;(5) communication chain The foundation on road: Air communication platform sends downstream communications link information, ground based terminal on downlink pilot frequency channel and Traffic Channel Uplink communication links information is sent on uplink communication links preferred channel.It is specific in detail to the expansion of above-mentioned technology contents below Explanation.
Fig. 1 is in one embodiment of the present of invention, using the structural schematic diagram of the vacant lot wireless communication system of ISM band. In this embodiment, using frequency division duplex mode, uplink communication links (i.e. ground based terminal to Air communication platform) choose ISM frequency 1 (such as 2.4GHz frequency range or 5.8GHz frequency range) of section, downstream communications link (i.e. Air communication platform to ground based terminal) are chosen ISM band 2 (such as 5.8GHz frequency range or 2.4GHz frequency range).Where it is assumed that AP point (Access Point, nothing in ISM band 1 Line access point) transmitting signal be sAP,1(t), the up channel between Air communication platform is hAP,1,A(t).Moreover, false If ground based terminal uses some channel f in ISM band 1USend uplink signal sU(t).If AP point is same in ISM band 1 Sample has used channel fUIt is communicated, then will be interfered to the signal of Air communication platform receiving earth terminal.At this point, The reception signal of Air communication platform may be expressed as:
yU(t)=hU(t)sU(t)+hAP,1,A(t)sAP,1(t) (1)
Air communication platform can use (such as the broader frequency spectrum sense based on small echo Edge check of broader frequency spectrum cognition technology Know) clear channel in detection ISM band 1, the idle channel that will test sorts from small to large by mean power spectral intensity, and By a idle channel of the smallest preceding N (N is positive integer, similarly hereinafter) of power spectral intensity as uplink communication links preferred channel collection.Its In, in order to avoid interference of the AP point signal transmitted to useful signal in ISM band 1, Air communication platform needs pair ISM band 1 is perceived and is detected, and determines whether each channel is idle, so that it is determined that available channel collection.Moreover, according to average function The order of rate spectral intensity from small to large sorts available channel, and in fixation pilot channel (the i.e. ISM band of downstream communications link Channel in 2) on by available channel sequence be broadcast to ground based terminal.
After ground based terminal receives the broadcast message, so that it may determine the idle channel f of uplink communication linksU, and with should Idle channel fUSend uplink signal.In this way, the uplink signal that Air communication platform is sent in receiving earth terminal When, it can be to avoid the interference of the AP point signal transmitted in ISM band 1.At this point, the reception signal of Air communication platform can table It is shown as:
yU(t)=hU(t)sU(t) (2)
Ground based terminal is in ISM band 2, the fixation pilot channel of downstream communications linkAnd Traffic ChannelUpper reception is empty The down link signal s that middle communications platform is sentD(t) when, it will receive AP in ISM band 2 and (work in channelWith) hair The number of delivering letters sAP,2(t) interference.In order to avoid this kind of interference, ground based terminal needs to obtain channelWithThe right to use.
In order to obtain the channel right to use, in one embodiment of the invention, ground based terminal can cheat formula using Sybi l Attack obtains the right to use of down channel by periodically sending deception frame, specific as shown in Figure 2.Wherein, TsFor deception The sending cycle of frame, WsFor the time span for cheating frame.Downlink pilot frequency channel in downstream communications link is chosen in ISM band 2 A fixed channelTraffic Channel chooses another channel in ISM band 2But the channel in ISM band 2WithThere are other wireless communication systems using.Ground based terminal is in order to obtain downlink pilot frequency channelAnd Traffic Channel's The right to use cheats frame by design, and periodically sends deception frame to obtain the channel right to use, to connect on these channels Receive the down link signal that Air communication platform is sent.
Frame is cheated by sending, channel obtained is (T using the length of time (available communication period)s-Ws).Work as sky Middle communications platform channel in ISM band 2WithUpper transmission down link signal sD(t) when giving ground based terminal, ground based terminal Not only receive sD(t), it also will receive the deception frame signal s of itself transmissionc(t).At this point, the reception signal of ground based terminal can indicate Are as follows:
yd(t)=hD(t)sD(t)+hI(t)sc(t) (3)
Due to cheating frame signal sc(t) intensity is far longer than required down link signal sD(t) intensity.Therefore, required Down link signal sD(t) deception frame signal s will be submerged inc(t) in, s can not be correctly demodulated at allD(t).For this reason, it may be necessary to mention For a kind of method eliminating deception frame signal and influencing, correctly to demodulate sD(t).In the prior art, it can use full duplex system Interference cancellation technology in system eliminates strong jamming sc(t), terminal complexity can but in this way be greatly increased.
Thus in one embodiment of the invention, deception frame signal s is eliminated using time division transmission aspectc(t) Bring strong jamming, is described as follows:
The timing that Air communication platform sends downlink signal is as shown in Figure 3.From figure 3, it can be seen that must sufficiently estimate sky Propagation delay time between middle communications platform and ground based terminal is likely to that Air communication platform is correctly arranged to send signal and ground end Sequential relationship between the termination collection of letters number.It is assumed that fixation pilot channel (ISM band of the Air communication platform in downstream communications link Channel in 2) by available channel sequence be broadcast to ground based terminal when, carry signal sending instant t0Information.In this way, ground Terminal is according to the initial time t1 of the broadcast frame received and sends the sending instant t of the 1st broadcast frame carried in signal0, Estimate the propagation delay time between Air communication platform and ground based terminal:
Δ t=t1-t0 (4)
Here, a problem for needing to solve is how to guarantee that ground based terminal can receive Air communication platform in downlink Fixation pilot channel (the channel i.e. in ISM band 2 of communication link) on the broadcast message that sends.In order to guarantee wherein extremely A rare broadcast frame is not spoofed frame interference, the time span for the broadcast frame that Air communication platform is sent in downstream communications link T0Following condition should be met:
2T0+Ws<Ts, T0+2Ws<Ts (5)
Wherein, TsFor the sending cycle for cheating frame, WsFor the time span for cheating frame.
At this point, Air communication platform can be by the way of repeating to send broadcast frame, to guarantee that ground based terminal can correctly connect The broadcast message from Air communication platform is received, wherein including the preferred channel information of uplink communication links.Specifically, aerial Fixation pilot channel (channel in ISM band 2 of the communications platform in downstream communications link) on to the ground terminal send broadcast Frame is at least separated by the time span W of deception framesAfter retransmit the broadcast frame.
Air communication platform is sent shown in mode such as Fig. 4 (b) of broadcast message.When meeting the condition of formula (5), ground is whole End can be properly received one of broadcast frame, as shown in Fig. 4 (c).
By above-mentioned time division transmission aspect, information exchange is carried out between ground based terminal and space communication platform When, Air communication platform is able to know that the operating mode of deception frame (cheats the time span W of framesWith sending cycle Ts).This Outside, Air communication platform is also able to know that its propagation delay time between ground based terminal.In this way, Air communication platform can basis Sending instant, sending cycle and its propagation delay time Δ t between ground based terminal for cheating frame, when determining the transmission of downlink signal Between, sending cycle, effectively avoid deception frame the transmission period in send signal.Ground based terminal just exists when receiving signal Channel clear period receives the useful signal from Air communication platform, and does not receive letter within the period of deception frame transmitting Number, to effectively prevent deception frame bring self-interference.
Preceding to have addressed, space communication platform is in fixed downlink pilot frequency channelOn to the ground terminal send broadcast message, Wherein using the smallest top n idle channel of power spectral intensity in ISM band 1 as uplink communication links preferred channel collection.Wide It broadcasts in information, further includes idle mode information (including the start-stop frequency, free time that uplink communication links preferred channel concentrates each channel Period etc.).Moreover, in order to allow ground based terminal that the broadcast message from space communication platform, air communication can be correctly received The mode that platform takes repetition to send sends broadcast frame, that is, after sending a broadcast frame, is at least spaced the time span of deception frame WsAfterwards, broadcast frame is sent again).In addition, when in order to allow ground based terminal that can estimate transmission of the Air communication platform to ground based terminal Prolong, the sending instant t of the 1st broadcast frame is further comprised in the broadcast message of downstream communications link0
Ground based terminal is according to the fixation pilot channel from Air communication platformOn downstream communications link broadcast letter Breath concentrates the preferred idle channel f for determining uplink communication links in uplink communication links preferred channelU.Moreover, ground based terminal root According to the sending instant t of the 1st broadcast frame carried in the initial time t1 and transmission signal of the broadcast frame received0, estimation sky Propagation delay time of the middle communications platform to ground based terminal:
Δtd=t1-t0 (6)
Then, ground based terminal is in preferred idle channel fUAccess request frame is sent to Air communication platform.It is aerial in order to allow Communications platform can send business information to ground based terminal, also carry the excellent of downstream communications link Traffic Channel in access request frame Select channelAnd preferred channelIdle mode information (the idling cycle T including channels, the first available communication period Initial time TU,b, end time TU,e).Moreover, in order to allow Air communication platform to estimate ground based terminal to Air communication platform Propagation delay time carries the sending instant T of the frame in access request frameU,0.In addition, being further comprised in access request frame aerial logical Propagation delay time Δ t of the letter platform to ground based terminal.
Air communication platform receives the access request frame from ground based terminal, obtains the time of reception of access request frame first TU,1.Then, according to the claim frame sending instant T carried in access request frameU,0, estimation ground based terminal to Air communication platform Propagation delay time:
Δtu=TU,1-TU,0 (7)
Moreover, Air communication platform obtains downstream communications link business letter according to the access request frame from ground based terminal The preferred channel in roadPreferred channelThe idle mode information (cycle T including channels, the first available communication period Initial time TU,b, end time TU,e) and Air communication platform to ground based terminal propagation delay time Δ t.Then, air communication is flat Platform is according to the propagation delay time Δ t of Air communication platform to ground based terminal and the initial time T of first idle periodU,b, determine the 1st The emission time initial lead TA and sending time length Δ T in a periodU:
TA=TU,b-Δt+Ws (8)
ΔTU=TU,e-Tu,b (9)
Then, Air communication platform is relative to time TU,b, in fixed downlink pilot frequency channelOn shifted to an earlier date with launch time It measures TA and sends access request response frame, frame length Ts=sending time length Δ TUSignal time slot+no signal blank interval. In no signal blank interval (i.e. available communication time period), ground based terminal does not receive signal, to be effectively prevented from deception frame Emission period receives signal, and ground based terminal is enabled to be properly received access request confirmation message.In this way, being believed by time division transmission Number mode, can be to avoid using complicated interference cancellation technology.
On the other hand, preferred idle channel f of the ground based terminal in uplink communication linksUUplink communication links communication is carried out, Air communication platform is in the fixed pilot channel of downlinkWith preferred Traffic ChannelUpper progress downstream communications link communication.Moreover, In downstream communications link, frame length Ts=sending time length Δ TUSignal time slot+no signal blank interval.In no letter In number blank interval (i.e. available communication time period), ground based terminal does not receive signal, to efficiently avoid in deception frame transmitting Period receives signal, and ground based terminal is enabled to be properly received the downstream communications link information from Air communication platform.
Compared with prior art, the sky of this vacant lot wireless communications method and its system especially suitable for lacking frequency spectrum resource Ground wireless communication system.In the uplink communication links of vacant lot wireless communication system, Air communication platform utilizes broader frequency spectrum sense The idle frequency spectrum for knowing technology perception ISM band obtains the preferred channel of uplink communication links, and passes through fixed descending pilot frequency letter Road notifies ground based terminal.In the downstream communications link of vacant lot wireless communication system, ground based terminal utilizes frequency spectrum perception or Sybil Deception formula attacks to obtain the channel resource of downstream communications link.Further, by the information exchange between vacant lot, vacant lot is established Between communication linkage.It is universal to solve vacant lot wireless communication system by making full use of the idle frequency spectrum of ISM band by the present invention The spectrum shortage problem faced, effectively increases the availability of frequency spectrum.
The vacant lot wireless communications method to provided by the present invention towards Air communication platform and its system carry out above Detailed description.For those of ordinary skill in the art, it is done under the premise of without departing substantially from true spirit Any obvious change, all will belong to the invention patent power protection scope.

Claims (10)

1. a kind of vacant lot wireless communications method towards Air communication platform, it is characterised in that include the following steps:
Step 1: Air communication platform obtains uplink communication links preferred channel collection;
Step 2: ground based terminal obtains the right to use of down channel by periodically sending deception frame;
Step 3: the Air communication platform sends broadcast message to the ground based terminal;
Step 4: the ground based terminal sends access to the Air communication platform and asks on the preferred channel of uplink communication links Seek frame;
Step 5: the Air communication platform sends access request response frame to the ground based terminal, establishes Ground-to-air Communication Link.
2. vacant lot wireless communications method as described in claim 1, it is characterised in that:
In the step 3, the Air communication platform sends broadcast message in a manner of repeating to send broadcast frame.
3. vacant lot wireless communications method as claimed in claim 2, it is characterised in that:
The time span T of the broadcast frame0Meet following condition:
2T0+Ws<Ts, T0+2Ws<Ts
Wherein, TsFor the sending cycle of the deception frame, WsFor the time span of the deception frame.
4. vacant lot wireless communications method as described in claim 1, it is characterised in that:
In the step 4, the Air communication platform obtains the time of reception of access request frame first, then according to the access The claim frame sending instant carried in claim frame, the propagation delay time of estimation ground based terminal to Air communication platform.
5. vacant lot wireless communications method as claimed in claim 4, it is characterised in that:
In the step 4, propagation delay time and first sky of the Air communication platform according to Air communication platform to ground based terminal The initial time of idle section determines emission time initial lead and sending time length Δ TU
6. vacant lot wireless communications method as claimed in claim 5, it is characterised in that:
In the step 5, the Air communication platform is sent with the emission time initial lead on downlink pilot frequency channel and is accessed Request response frame.
7. vacant lot wireless communications method as claimed in claim 6, it is characterised in that:
In the access request response frame, frame length=sending time length Δ TUSignal time slot+no signal blank interval;Its In, in no signal blank interval, the ground based terminal does not receive signal.
8. vacant lot wireless communications method as described in claim 1, it is characterised in that:
In the step 1, the Air communication platform detects the clear channel in ISM band using broader frequency spectrum cognition technology, The idle channel that will test sorts from small to large by mean power spectral intensity, and the smallest top n of power spectral intensity is idle Channel is as the uplink communication links preferred channel collection;Wherein, N is positive integer.
9. a kind of vacant lot wireless communication system towards Air communication platform, including Air communication platform and ground based terminal, special Sign is:
Between the Air communication platform and the ground based terminal using the vacant lot described in any one of claim 1~8 without Line communication means realizes air-ground dialogue.
10. vacant lot wireless communication system as claimed in claim 9, it is characterised in that:
The Air communication platform is the unmanned plane for being equipped with wireless relay apparatus, stratospheric airship, satellite or captive balloon.
CN201811163495.4A 2018-09-30 2018-09-30 A kind of vacant lot wireless communications method and its system towards Air communication platform Pending CN109361448A (en)

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