CN102892163A - Ground-air wideband communication switching method and system under high-speed moving condition - Google Patents

Ground-air wideband communication switching method and system under high-speed moving condition Download PDF

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Publication number
CN102892163A
CN102892163A CN2011102039977A CN201110203997A CN102892163A CN 102892163 A CN102892163 A CN 102892163A CN 2011102039977 A CN2011102039977 A CN 2011102039977A CN 201110203997 A CN201110203997 A CN 201110203997A CN 102892163 A CN102892163 A CN 102892163A
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base station
signal quality
base stations
current base
aircraft
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CN102892163B (en
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张劭洁
黎超
焦现军
段世平
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Hang Guang satellite network limited liability company
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Beijing Weibang Yuanhang Wireless Technology Co Ltd
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Priority to PCT/CN2011/084239 priority patent/WO2013010370A1/en
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    • 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

Abstract

The invention discloses a ground-air wideband communication switching method and system under a high-speed moving condition. The ground-air wideband communication switching method comprises the following steps that: a current base station acquires aircraft position information and aircraft posture change information from aircraft-mounted terminal equipment; the aircraft-mounted terminal equipment measures and reports the signal quality of the current base station; the aircraft-mounted terminal equipment starts to measure a transmitting signal of a neighboring base station and reports the signal quality of the neighboring base station according to the signal quality of the current base station or a switching measurement request sent by the current base station; the current base station performs cross-region switching from the current base station to the neighboring base station according to the aircraft posture change information, the signal quality of the current base station and the signal quality of the neighboring base station. According to the ground-air wideband communication switching method and system disclosed by the invention, an effective switching decision can be made when the signal strength received by a terminal becomes weak according to position information and gesture information of an aircraft, so that performance reduction caused by ping-pong effect and too late switching decision can be avoided, in-time, effective, quick and smooth switching can be realized, and therefore service quality of ground-air wideband business is finally ensured.

Description

Under the high-speed mobile changing method and the system of empty broadband connections
Technical field
The present invention relates to WiMAX earth-space communication field and aviation field of information management, realize that particularly wireless earth-space communication switches and system and the changing method of high-bandwidth communication.
Background technology
Along with the development of mobile communication technology, people not only have been satisfied with ground communication, communication service to other occasions for example the covering demand in spatial domain day by day highlight.How be applied in mobile communication technology in the air line and realize that therein broadband earth-space communication business has become the emphasis of domestic and international research.And the switching problem of terminal in flight course that wherein how to solve high-speed mobile is the beechnut broadband services, especially the key of real time business quality assurance.And existing ground-based cellular systems is solving the particularity of not considering air communications on the switching problem, such as under the particular job frequency range, the weather conditions such as rainfall can be brought more serious signal fadeout, and aircraft flight attitude changes the airframe that causes can cause signal quality 20-30dB to blocking of aerial signal serious fading problem.When running into the problem that lasting covering deficiency occurs, the land mobile communication system solves by the laying that increases base station or repeater usually.And under the earth-space communication scene, increase number of base stations, and the site that then can increase base station number and increase the cloth station, these modes are because the earth-space communication siting of station is difficult, the high in cost of production reason can't be implemented.In this case, iff passing through to judge signal quality as the condition of switch decision, cause that easily mistake is switched and even frequent " ping-pong " that switches that come and go of generation.
On the other hand, begin neighbor base stations is measured in the prior art when signal quality descends, the long meeting of Measuring Time causes putting evening switching time, and quality of service descends serious; Too short then being difficult to of Measuring Time got rid of the instantaneous interference factor, causes mistake switching and ping-pong.Therefore, need the improvement technology, thereby accurately judge switching time, guarantee before current link-quality descends, in time to switch to preferably neighbor cell of signal, to guarantee the stationarity of quality of service.
Moreover, the terminal that current Ground Communication System adopts with the current base station communication process in need constantly to measure the neighbor cell signal quality, in order to generate a candidate's adjacent area base station shifting tabulation, so that terminal can in time switch to corresponding Target cell in the table, but this method needs terminal constantly to measure the neighbor base stations channel.This method is measured longer duration, measures the computing cost that brings large, not too is fit to have the beechnut of definite terminal (aircraft) positional information and attitude information.
Summary of the invention
Technical problem to be solved by this invention provides a kind of system and method for realizing the empty broadband connections in ground, is used for realizing that the broadband wireless communications of the airborne equipment under the at high speed empty broadband connections and the quick and stable of network switch.
According to first aspect present invention, provide under a kind of high-speed mobile the changing method of empty broadband connections, may further comprise the steps:
A, current base station obtain aircraft-position information and aspect change information from described Airborne Terminal equipment;
B, Airborne Terminal device measuring and report the signal quality of current base station;
C, Airborne Terminal equipment start the measurement that neighbor base stations is transmitted, and report the neighbor base stations signal quality according to the signal quality of current base station or the handover measurement request of current base station transmission;
D, current base station are carried out the handover from described current base station to neighbor base stations according to aspect change information, current base station signal quality and neighbor base stations signal quality.
Above-mentioned steps A can realize by following steps:
A1, Airborne Terminal equipment obtain aircraft-position information and air speed information by global navigation satellite system GNSS;
A2, Airborne Terminal equipment report current base station to described aircraft-position information and velocity information, and current base station Negotiation speed information calculations obtains the aspect change information; Perhaps Airborne Terminal equipment reports described current base station to the aspect change information that described aircraft-position information and Negotiation speed information calculations obtain.
Above-mentioned steps A can also realize by following steps:
A1 ', Airborne Terminal equipment utilization navigation system obtain aircraft-position information, utilize attitude transducer to obtain the aspect change information;
A2 ', Airborne Terminal equipment report current base station to described aircraft-position information and attitude change information.Wherein, described attitude transducer can be gyroscope.
Wherein, described step C comprises:
C1, Airborne Terminal equipment compare current base station signal quality and predetermined threshold;
C2, when comparative result is described current base station signal quality when being less than or equal to predetermined threshold, start voluntarily the measurement to the neighbor base stations signal, and report based on starting voluntarily the neighbor base stations measurement report of measuring.
Wherein, described step C comprises:
If C3 determines that according to described aircraft-position information aircraft enters the moment in current base station far point zone from current base station near point zone in current base station, do not receive based on starting voluntarily the neighbor base stations signal quality of measuring, then send the handover measurement request to Airborne Terminal equipment;
C4, the described handover measurement request of described Airborne Terminal device responds start the measurement to the neighbor base stations signal, and report the neighbor base stations signal quality that starts measurement based on request.
Wherein, described step D comprises:
After D1, current base station are received described neighbor base stations signal quality, judge that whether the changing value of aspect change information is greater than threshold value;
If greater than threshold value, then suspending, the D2 changing value switches;
If the D3 changing value is less than threshold value, judge further then whether the neighbor base stations signal quality is higher than the current base station signal quality, if the neighbor base stations signal quality is higher than current base station signal quality and both differences greater than certain value, then announcement machine mounted terminal equipment switches, and switches otherwise then suspend.
Above-mentioned steps D is specially:
After D1 ', current base station are received the neighbor base stations signal quality that Airborne Terminal equipment reports, judge that the measurement of the neighbor base stations signal quality that Airborne Terminal equipment reports starts attribute;
D2 ' belongs to voluntarily startup if judge the measurement of neighbor base stations signal quality, whether the changing value of then judging the flight attitude change information surpasses threshold value, and when described changing value surpasses threshold value, then this measured value is not counted in mean value, otherwise, this measured value is counted on average, and relatively switching by neighbor base stations signal quality and current base station signal quality;
D3 ' belongs to according to the request startup if judge the measurement of neighbor base stations signal quality, whether the changing value of then judging the flight attitude change information surpasses threshold value, and when described changing value surpasses threshold value, then this measured value is not counted in mean value, otherwise, this measured value is counted on average, and relatively switching by neighbor base stations signal quality and current base station signal quality.
Wherein, step D2 ' is described to be comprised by relatively switching of neighbor base stations signal quality and current base station signal quality: if the neighbor base stations signal quality is higher than current base station signal quality and difference greater than the first predetermined value, then announcement machine mounted terminal equipment switches; Otherwise, then suspend and switch.
Wherein, step D3 ' is described to be comprised by relatively switching of neighbor base stations signal quality and current base station signal quality: if the neighbor base stations signal quality is higher than current base station signal quality and difference greater than the second predetermined value, then announcement machine mounted terminal equipment switches; Otherwise, then suspend and switch; Wherein said the first predetermined value is greater than described the second predetermined value.
Wherein, described neighbor base stations signal quality and current base station signal quality include signal strength signal intensity or Signal Interference and Noise Ratio; In the case, described neighbor base stations signal quality is higher than the current base station signal quality and comprises: the signal strength signal intensity of neighbor base stations is greater than the signal strength signal intensity of current base station, and perhaps the Signal Interference and Noise Ratio of neighbor base stations is greater than the Signal Interference and Noise Ratio of current base station.
According to a second aspect of the invention, provide under a kind of high-speed mobile the switched system of empty broadband connections, comprising:
Aircraft position and Attitute detecting device are used for obtaining aircraft-position information and aspect change information by detecting position and the attitude of aircraft;
Be positioned at the Airborne Terminal equipment on the aircraft, be used for reporting described aircraft-position information and aspect change information, measure and report the current base station signal quality, and according to the signal quality of current base station or the handover measurement request of current base station transmission, the measurement that startup transmits to neighbor base stations, and report the neighbor base stations signal quality;
Ground base station equipment, be used for receiving aircraft-position information and aspect change information and current base station signal quality and the neighbor base stations signal quality that described Airborne Terminal equipment reports, send described handover measurement request according to aircraft-position information to Airborne Terminal equipment, and according to aspect change information, current base station signal quality and neighbor base stations signal quality, carry out the handover from described current base station to neighbor base stations.
Wherein, described Airborne Terminal equipment comprises:
Current base station signal measurement and comparison module be used for to be measured the signal quality of current base station, and signal quality and the predetermined threshold of current base station compared;
The neighbor base stations signal measurement module, be used for when the current base station signal quality is less than or equal to predetermined threshold, start voluntarily the measurement to the neighbor base stations signal, perhaps according to described handover measurement request, startup is to the measurement of neighbor base stations signal, and reports based on starting voluntarily and measure or start the neighbor base stations signal quality of measuring based on request.
Wherein, described ground base station equipment comprises:
The base station transceiver module is used for aircraft-position information and aspect change information and current base station signal quality and neighbor base stations signal quality that receiver mounted terminal equipment reports, and sends the handover measurement request;
The handover measurement request sending module, determine that according to described aircraft-position information aircraft enters the switching preparation moment in current base station far point zone from current base station near point zone, and before this switching is prepared constantly, do not receive based on starting voluntarily in the situation of the neighbor base stations signal quality of measuring, send the handover measurement request to Airborne Terminal equipment.
Wherein, described ground base station equipment also comprises:
Measure startup determined property module, start attribute for the measurement of judging the neighbor base stations signal quality that Airborne Terminal equipment reports;
Handover module, start when the measurement of judging the neighbor base stations signal quality belongs to voluntarily, judge further then whether flight attitude information change value surpasses threshold value, and time-out switches when flight attitude information change value surpasses threshold value, otherwise then announcement machine mounted terminal equipment switches; Start when the measurement of judging the neighbor base stations signal quality belongs to according to request, then compare neighbor base stations signal quality and current base station signal quality, and when the neighbor base stations signal quality was higher than the current base station signal quality, announcement machine mounted terminal equipment switched.
With respect to prior art, technique effect of the present invention is: effective switching judging order can be made according to positional information and the attitude information of aircraft in the base station, avoided aircraft owing to being in turning, the air-flow ping-pong that the labile state that causes causes that jolts, and can avoid descending because of the communication quality that handover decisions causes excessively evening, guarantee timely, effective, quick, level and smooth switching, improved the stability of performance, thereby effectively guaranteed the service quality of the empty broadband connections in ground.
Description of drawings
Fig. 1 is empty wide-band communication system schematic diagram of the present invention;
Fig. 2 a is the high-level schematic functional block diagram of switched system of the present invention;
Fig. 2 b is the high-level schematic functional block diagram of the Airborne Terminal equipment among Fig. 2 a;
Fig. 3 is the handling process of attitude information computing module in the system function module of the present invention;
Fig. 4 is handover module process chart in base station in the system function module of the present invention;
Fig. 5 is aircraft flight near point of the present invention and far point area schematic;
Fig. 6 is the switching schematic diagram of aircraft of the present invention in flight course.
Embodiment
Below in conjunction with the description of drawings embodiments of the present invention.
Fig. 1 is empty wide-band communication system schematic diagram of the present invention, shown in the invention system in, GNSS system 1 and Airborne Terminal equipment 2 are installed on the aircraft 3, ground base station 4 and ground base station 5 and location server 6 and 7, location server are positioned at ground, base station 4 or base station 5 communicate by Airborne Terminal equipment 2 on wireless communication link 8 and the aircraft respectively, carry out information interaction by ground core network 9 between base station 4 and the base station 5, base station and location server carry out information interaction by communication link 10.
Airborne Terminal equipment 2 on the aircraft only communicates with a ground base station usually, such as communicating with ground base station 4, the present invention is referred to as current base station with the current ground base station 4 that communicates with Airborne Terminal equipment 2, and the ground base station 5 that will not communicate is referred to as neighbor base stations.
Below in conjunction with Fig. 1 illustrate under a kind of high-speed mobile of the present invention the changing method of empty broadband connections.
Current base station 4 obtains aircraft-position information and aspect change information from described Airborne Terminal equipment 2;
The measurement report that contains the current base station signal quality is measured and reported to Airborne Terminal equipment 2 in real time, and this signal quality is that Airborne Terminal equipment 2 measures by the wireless signal that current base station 4 is sent, and sends to current base station 4 by measurement report;
Airborne Terminal equipment is according to the signal quality of measured current base station or the handover measurement request of current base station 4 transmissions, the measurement that startup transmits to neighbor base stations, and the neighbor base stations signal quality that reports by measurement report, startup just means the neighbor base stations signal measurement and enters the handover stage, the present invention starts the neighbor base stations signal measurement according to two kinds of situations: the first, the unexpected variation of current base station signal, it two is, aircraft enters current base station far point zone from current base station near point zone, in order to guarantee Airborne Terminal equipment by switching, communicate with the best base station of signal quality all the time;
Current base station 4 is carried out the handover from described current base station to neighbor base stations according to aspect change information, current base station signal quality and neighbor base stations signal quality.
But the present invention's Airborne Terminal equipment via satellite navigation system (such as GPS or GNSS) obtains aircraft-position information, obtain aspect information (obtaining three-axis attitude information as utilizing gyroscope) by the aspect transducer, then by comparing with current aspect information, obtain the aspect change information, then Airborne Terminal equipment 2 reports current base station 4 with aircraft-position information and attitude change information, makes current base station 4 obtain aircraft-position information and attitude change information.
On the other hand, the present invention also can utilize the GNSS on the aircraft to obtain aircraft-position information and attitude change information, and concrete operation step is as follows:
Airborne Terminal equipment 2 is by positional information and velocity information on three directions of airborne satellite navigation system GNSS acquisition aircraft;
Airborne Terminal equipment 2 reports current base station 4 to described aircraft-position information and velocity information, and current base station 4 Negotiation speed information calculations obtain the aspect change information, makes current base station 4 obtain aircraft-position information and aspect change information.
Certainly, Airborne Terminal equipment 2 also can calculate the aspect change information with velocity information first, and then aircraft-position information and aspect change information are reported described current base station 4.
Fig. 3 has shown the flow process of utilizing air speed information calculations attitude change information.As shown in Figure 3, location server 6 obtains the velocity information 32 of the aircraft that Airborne Terminal equipment 2 reports from current base station 4, and the speed here refers to east orientation, north orientation and upward velocity measured value Afterwards with Kalman filtering to east orientation, north orientation with upward carry out independent filtering to data and obtain east orientation, north orientation, upward velocity and acceleration optimal estimation 33
Figure BDA0000077242540000072
33 inputs as pseudo-Attitude Calculation, optimal velocity, the acceleration valuation that 34 pseudo-attitude obtains according to each Kalman filtering calculate pseudo-yaw angle, the pseudo-angle of pitch, pseudo-rolling/roll angle Ψ s, θ s, Φ s, wherein: Ψ S = arctan ( v N v E ) , θ S = arctan ( v U v E 2 + v N 2 ) ,
φ S = arcsin ( L · P | L | | P | ) = arcsin ( ( L E i + L N j + L U k ) · ( P E i + P N j ) L E 2 + L N 2 + L U 2 P E 2 + P N 2 ) = arcsin ( L E P E + L N P N L E 2 + L N 2 + L U 2 P E 2 + P N 2 ) , P represents the horizontal reference vector, is obtained by acceleration of gravity vector and velocity multiplication cross, and the L representative promotes acceleration.35 t-T constantly attitude information saves as Ψ S_old, θ S_old, Φ S_old, then carry out difference 36 and calculate attitude changing value Δ Ψ s, Δ θ s, ΔΦ s.Circular is referring to " Liu Ruihua is opened roc Zhang Lei based on pseudo-attitude measurement algorithm research [journal article] the Civil Aviation University of China journal 2009 of single-antenna GPS ", " Cai Qingchun Wang Hui south attitude Determination with Single-antenna GPS Receiver [journal article] Institutes Of Technology Of Nanjing journal 2002 ".
As mentioned above, if the unexpected variation of current base station signal, the present invention will start signal quality measured to neighbor base stations 5 voluntarily, and concrete operation step is as follows:
Airborne Terminal equipment 2 compares current base station signal quality and predetermined threshold in real time;
When comparative result is current base station signal quality when being less than or equal to predetermined threshold, start voluntarily the measurement to the neighbor base stations signal, and report based on measuring voluntarily the neighbor base stations measurement report that starts.
This is measured voluntarily and starts usually and the location independent of aircraft, no matter aircraft is positioned at current base station near point zone still is positioned at current base station far point zone, as long as the current base station signal variation that Airborne Terminal equipment receives, Airborne Terminal equipment all can start the measurement to the neighbor base stations signal voluntarily.
In addition, current base station also will determine whether aircraft has entered current base station far point zone from current base station near point zone according to the positional information that base station terminal equipment reports.If determine that in current base station aircraft enters the moment in current base station far point zone from current base station near point zone, do not receive that then current base station sends the handover measurement request to Airborne Terminal equipment 2 based on starting voluntarily the neighbor base stations signal quality of measuring.2 these handover measurement requests of response of Airborne Terminal equipment start the measurement to the neighbor base stations signal, and report the neighbor base stations signal quality that starts measurement based on request, and the present invention is referred to as this measurement to the neighbor base stations signal quality to measure according to request.
The present invention carries out switching from the current base station to the neighbor base stations according to aspect change information, positional information, current base station signal quality and neighbor base stations signal quality, its operating procedure is: after current base station is received described neighbor base stations signal quality, judge that whether the changing value of aspect change information is greater than threshold value; If greater than threshold value, then suspending, changing value switches; If changing value is less than threshold value, judge further then whether the neighbor base stations signal quality is higher than the current base station signal quality, if the neighbor base stations signal quality is higher than current base station signal quality and both differences greater than certain value, then announcement machine mounted terminal equipment switches, and switches otherwise then suspend.
In a specific embodiment, can realize switching from the current base station to the neighbor base stations by following steps:
After current base station is received the neighbor base stations signal quality that Airborne Terminal equipment reports, the measurement of judging the neighbor base stations signal quality that Airborne Terminal equipment reports starts attribute, judges that namely the neighbor base stations signal quality belongs to Airborne Terminal equipment and starts voluntarily the handover measurement request that measurement still belongs to the base station transmission;
Belong to voluntarily startup if judge the measurement of neighbor base stations signal quality, whether the changing value of then judging the flight attitude change information surpasses threshold value, and when described changing value surpasses threshold value, suspend and switch, otherwise, relatively switching by neighbor base stations signal quality and current base station signal quality then;
If judging the measurement of neighbor base stations signal quality belongs to according to handover measurement request startup, then relatively switching by neighbor base stations signal quality and current base station signal quality.
Measurement at the neighbor base stations signal quality belongs in the situation about starting voluntarily, the above-mentioned step of relatively switching of passing through neighbor base stations signal quality and current base station signal quality comprises: if the neighbor base stations signal quality is higher than current base station signal quality and difference greater than the first predetermined value, then announcement machine mounted terminal equipment switches; Otherwise, then suspend and switch.
Measurement at the neighbor base stations signal quality belongs in the situation about starting according to the handover measurement request, the above-mentioned step of relatively switching of passing through neighbor base stations signal quality and current base station signal quality comprises: if the neighbor base stations signal quality is higher than current base station signal quality and difference greater than the second predetermined value, then announcement machine mounted terminal equipment switches; Otherwise, then suspend and switch; Wherein said the first predetermined value is greater than described the second predetermined value.
The measurement startup attribute of judging the neighbor base stations signal quality that Airborne Terminal equipment reports can pass through following dual mode realization:
Mode one, after receiving the neighbor base stations signal quality that Airborne Terminal equipment reports, current base station is searched handover measurement request record from daily record, if find record, the measurement of then judging this neighbor base stations signal quality belongs to according to the handover measurement request and starts; If do not find, judge that then the measurement of this neighbor base stations signal quality belongs to voluntarily startup;
Mode two, after receiving the neighbor base stations signal quality that Airborne Terminal equipment reports, detect its attribute-bit, because Airborne Terminal equipment gives this two kinds of attribute-bits that the neighbor base stations signal quality is different, therefore can determine that the measurement of neighbor base stations signal quality belongs to start still to belong to voluntarily according to the handover measurement request according to the attribute-bit that detects and start.
As mentioned above, neighbor base stations signal quality and current base station signal quality all are transferred to current base station by corresponding measurement report, and measurement report can comprise: measure the startup sign, Base Station Identification (such as, the current base station sign, the neighbor base stations sign), the base station signal quality.
The base station signal quality comprises signal strength signal intensity or Signal Interference and Noise Ratio, and therefore, above-mentioned neighbor base stations signal quality is higher than the current base station signal quality and usually has two kinds of situations, first, the signal strength signal intensity of neighbor base stations is greater than the signal strength signal intensity of current base station; The second, the Signal Interference and Noise Ratio of neighbor base stations is greater than the Signal Interference and Noise Ratio of current base station.
Fig. 2 a shown under the high-speed mobile of the present invention the structure of switched system of empty broadband connections.Shown in Fig. 2 a, under the high-speed mobile of the present invention the switched system of empty broadband connections comprise:
Aircraft position and Attitute detecting device 1, position and attitude for detect aircraft by the GNSS system on the aircraft obtain aircraft-position information and aspect change information;
Be positioned at the Airborne Terminal equipment 2 on the aircraft, be used for reporting described aircraft-position information and aspect change information, measure and report the current base station signal quality, and according to the signal quality of current base station or the handover measurement request of current base station transmission, the measurement that startup transmits to neighbor base stations, and report the neighbor base stations signal quality;
Ground base station equipment, be used for receiving aircraft-position information and aspect change information and current base station signal quality and the neighbor base stations signal quality that described Airborne Terminal equipment reports, send described handover measurement request according to aircraft-position information to Airborne Terminal equipment, and according to aspect change information, current base station signal quality and neighbor base stations signal quality, carry out the handover from described current base station to neighbor base stations.
Fig. 2 b has shown the structure of Airborne Terminal equipment 2, and shown in Fig. 2 b, Airborne Terminal equipment 2 comprises:
Current base station signal measurement module 21 is for the signal quality of measuring and report current base station;
Neighbor base stations signal measurement module 22, be used for when the current base station signal quality is less than or equal to predetermined threshold, start voluntarily the measurement to the neighbor base stations signal, perhaps according to described handover measurement request, startup is to the measurement of neighbor base stations signal, and reports based on starting voluntarily and measure or start the neighbor base stations signal quality of measuring based on request; And
Airborne Terminal equipment transceiver module 23, be used for reporting from the current base station of current base station signal measurement module 21 and neighbor base stations signal measurement module 22 and the signal quality of neighbor base stations, the handover measurement request that current base station 4 is sent is transmitted to neighbor base stations signal measurement module 22.
Shown in Fig. 2 a, ground base station equipment comprises:
Base station transceiver module 41 is used for aircraft-position information and aspect change information and current base station signal quality and neighbor base stations signal quality that receiver mounted terminal equipment 1 reports, sends the handover measurement request;
Handover measurement request sending module 42, determine that according to described aircraft-position information aircraft enters the switching preparation moment in current base station far point zone from current base station near point zone, and in the situation that this switching is not received the neighbor base stations signal quality before preparing constantly, send the handover measurement request to Airborne Terminal equipment, that is to say, only in the situation that base station transceiver module 41 is not received the neighbor base stations signal quality, this module 42 can generate and send the handover measurement request.
Ground base station equipment also comprises: measure startup determined property module 43, base station handover module 44 and location server 6.Measure and start the measurement startup attribute that determined property module 43 is used for judging described neighbor base stations signal quality.Base station handover module 44 is used for: start when the measurement of judging the neighbor base stations signal quality belongs to voluntarily, judge further whether flight attitude information change value surpasses threshold value, and time-out switches when flight attitude information change value surpasses threshold value, otherwise then announcement machine mounted terminal equipment switches; Start when the measurement of judging the neighbor base stations signal quality belongs to according to request, then compare neighbor base stations signal quality and current base station signal quality, and when the neighbor base stations signal quality was higher than the current base station signal quality, announcement machine mounted terminal equipment switched.Location server 6 obtains position and the velocity information that Airborne Terminal equipment reports by base station transceiver module 41, and Negotiation speed information is calculated the aspect change information.
Fig. 4 has shown the handling process of base station of the present invention handover module 44.After the neighbor base stations measurement report 41 of terminal to report is received in the base station, read attitude changing value Δ Ψ s from location server 6, Δ θ s, ΔΦ s 42, with threshold value Ψ 1, θ 1 respectively, Φ 1 compares 43, if wherein arbitrary value surpasses threshold value 50, think then that aspect is current to play pendulum, measured value is not averaged processing.Otherwise the measurement result value that reports is averaged 44.If this moment aircraft to report be initiatively to initiate 45 by the base station, show that then being in the near point zone enters the far point regional stage, then measurement result mean value and threshold value Diff2 are compared 46, then switch 48 greater than threshold value, be lower than thresholding and then do not switch 49; Otherwise show that aircraft still is in the near point zone this moment, measurement result mean value and threshold value Diff1 are compared 47, then switch 48 greater than threshold value, be lower than threshold value and then do not switch 49.
Fig. 5 is aircraft flight near point of the present invention and far point area schematic.The border circular areas 51 of outside has shown the coverage of base station signal.The gray area 52 of the inside is the near point zone of base station.In the base station range, the zone except the near point zone is far point zone 53.The adjacent base station aloft performance number of certain position equals this base station in the performance number (Pa=Pb) of this position, and the position that this base station equates with adjacent base station power value is L to the distance of this base station.The near point zone is din=λ L (59), and wherein λ is not more than 1 constant., the flight path of aircraft can be divided into four kinds of situations: aircraft enters near point zone 54 by the far point zone, and aircraft enters far point zone 55 by the near point zone, and aircraft flies 56 in the near point zone, and aircraft flies 57 in the far point zone.
Fig. 6 is the switching schematic diagram of aircraft of the present invention in flight course.Solid line with arrow is track and the direction 61 of aircraft flight.When aircraft during in position 62, connect 63 with base station a.1. aircraft successively experiences and enters near point zone, a base station 64 from far point zone, a base station afterwards, and 3. in a base station near point zone flight 65.When aircraft flew to position 67, base station a found that by the positional information that receives aircraft leaves the near point zone of base station a, enters the far point zone 68 of base station a, so base station a requires terminal that adjacent base station is measured to the request of terminal transmission handover measurement.After terminal is measured measurement report is issued base station a, when base station a judges that the signal of base station b is strong and during than the high diff2 of a, notification terminal switches to base station b, and the information exchange of terminal is crossed ground core network issue base station b.Terminal and a break link connect 69 with base station b.If aircraft signal quality in flight course descends and is lower than threshold value, then terminal begins adjacent base station is measured, and send measurement report to current base station, after receive the base station, the access location server obtains the flight attitude information of aircraft, if the aspect changing value surpasses threshold value, then temporarily do not switch; Otherwise the signal of base station b is strong and than the high diff1 of a, then notification terminal switches to base station b if calculate.
In sum, the present invention proposes a kind of switched system of realizing at high speed empty broadband connections, comprise that being distributed in ground along the course line installs N base station, described N is the integer constant greater than 2; Communicate by ground core network between the base station; The wireless signal overlay area of contiguous described base station overlaps mutually.Ground is equipped with location server simultaneously, is connected with the base station.The airborne wireless communication terminal is installed in the cabin of aircraft, and the GNSS Position Fixing Navigation System is installed on the aircraft simultaneously.GNSS can obtain the positional information of aircraft in real time, and send to ground base station by the airborne wireless communication terminal on the machine, the base station is transmitted to positional information server with it, and the Attitude Calculation module on the location server calculates the attitude change information of aircraft according to the aircraft-position information of receiving.
The basic principle that realizes that the empty broadband connections in ground is switched of the present invention is:
Airborne Terminal equipment 2 on the aircraft keeps communication connection and period measurement current base station to send the intensity of signal with current base station 4 with normal condition, when detecting the current demand signal Quality Down and being lower than the signal quality threshold value, terminal begins neighbor base stations 5 is measured, and to current connection base station report neighbor base stations measurement result, measurement result comprises neighbor base stations ID number, signal strength signal intensity RSSI, the information such as Signal Interference and Noise Ratio CINR.
Current base station 4 obtains the current flight attitude of aircraft and changes and positional information with period of time T access location server.According to the signal power coverage of base station is divided into the near point zone and far point regional, when detecting the aircraft-position information demonstration, the base station enters the far point zone from the near point zone, but do not receive the handover measurement report of aircraft, then initiatively send the request of measurement to terminal, require terminal to switch to Target cell, terminal begins the neighbor base stations signal is measured, and sends the handover measurement report to the base station.
After current base station 4 is received the neighbor base stations measurement report, the signal measurement result of each adjacent base station is averaged.And from location server, read the current attitude change information of aircraft, if changing breath, the attitude letter shows that aircraft is in labile states such as turning or inclinations, does not then make switch decision.Otherwise the current positional information of aircraft is read in the base station from location server, calculate the relative distance with terminal.If the relative distance of base station and terminal is less than D1, think that then terminal is in the near point zone of base station, if show residential quarter than the average signal interference-to-noise ratio CINR high Diff1 of current area in the measurement result this moment, then the base station determines terminal is switched to the strongest residential quarter of CINR mean value; The relative distance of terminal and base station is greater than D1 else if, think that then terminal is in the far point zone of base station, if the measurement report that this moment, current base station was received is terminal is initiatively measured request to the base station feedback, and the measurement result demonstration exists neighbor base stations than the strong Diff2 of CINR of current base station, and then current base station requires terminal to switch to the strongest residential quarter corresponding to base station of CINR mean value.
D1 wherein, Diff1, Diff2 are the real constant greater than zero.
The present invention can allow the base station make effective switching judging order according to positional information and the attitude information of aircraft, avoided aircraft owing to being in turning, the air-flow ping-pong that the labile state that causes causes that jolts, and can avoid descending because of the communication quality that handover decisions causes excessively evening, guaranteed timely, effective, quick, level and smooth switching, improve the stability of switching, thereby effectively guaranteed the service quality of the empty broadband connections in ground.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.

Claims (11)

  1. Under the high-speed mobile the changing method of empty broadband connections, may further comprise the steps:
    A, current base station obtain aircraft-position information and aspect change information from described Airborne Terminal equipment;
    B, Airborne Terminal device measuring and report the current base station signal quality;
    C, Airborne Terminal equipment start the measurement that neighbor base stations is transmitted, and report the neighbor base stations signal quality according to the signal quality of current base station or the handover measurement request of current base station transmission;
    D, current base station are carried out the handover from described current base station to neighbor base stations according to aspect change information, aircraft-position information, current base station signal quality and neighbor base stations signal quality.
  2. 2. method according to claim 1, wherein, described steps A comprises:
    A1, Airborne Terminal equipment obtain aircraft-position information and air speed information by global navigation satellite system GNSS;
    A2, Airborne Terminal equipment report current base station to described aircraft-position information and velocity information, and current base station Negotiation speed information calculations obtains the aspect change information; Perhaps Airborne Terminal equipment reports described current base station to the aspect change information that described aircraft-position information and Negotiation speed information calculations obtain.
  3. 3. method according to claim 1, wherein, described steps A comprises:
    A1 ', Airborne Terminal equipment utilization navigation system obtain aircraft-position information, utilize attitude transducer to obtain the aspect change information;
    A2 ', Airborne Terminal equipment report current base station to described aircraft-position information and attitude change information.
  4. 4. according to claim 1 and 2 or 3 described methods, wherein, described step C comprises:
    C1, Airborne Terminal equipment compare current base station signal quality and predetermined threshold;
    C2, when comparative result is described current base station signal quality when being less than or equal to predetermined threshold, start voluntarily the measurement to the neighbor base stations signal, and report based on starting voluntarily the neighbor base stations measurement report of measuring.
  5. 5. method according to claim 4, wherein, described step C comprises:
    If C3 determines that according to described aircraft-position information aircraft enters the moment in current base station far point zone from current base station near point zone in current base station, do not receive based on starting voluntarily the neighbor base stations signal quality of measuring, then send the handover measurement request to Airborne Terminal equipment;
    C4, the described handover measurement request of described Airborne Terminal device responds start the measurement to the neighbor base stations signal, and report the neighbor base stations signal quality that starts measurement based on request.
  6. 6. method according to claim 5, wherein, described step D comprises:
    After D1, current base station are received described neighbor base stations signal quality, judge that whether the changing value of aspect change information is greater than threshold value;
    If greater than threshold value, then suspending, the D2 changing value switches;
    If the D3 changing value is less than threshold value, judge further then whether the neighbor base stations signal quality is higher than the current base station signal quality, if the neighbor base stations signal quality is higher than current base station signal quality and both differences greater than certain value, then announcement machine mounted terminal equipment switches, and switches otherwise then suspend.
  7. 7. method according to claim 6, wherein, described neighbor base stations signal quality and current base station signal quality include signal strength signal intensity or Signal Interference and Noise Ratio;
    Described neighbor base stations signal quality is higher than the current base station signal quality and comprises: the signal strength signal intensity of neighbor base stations is greater than the signal strength signal intensity of current base station, and perhaps the Signal Interference and Noise Ratio of neighbor base stations is greater than the Signal Interference and Noise Ratio of current base station.
  8. Under the high-speed mobile the switched system of empty broadband connections, comprising:
    Aircraft position and Attitute detecting device are used for obtaining aircraft-position information and aspect change information by detecting position and the attitude of aircraft;
    Be positioned at the Airborne Terminal equipment on the aircraft, be used for reporting described aircraft-position information and aspect change information, measure and report the current base station signal quality, and according to the signal quality of current base station or the handover measurement request of current base station transmission, the measurement that startup transmits to neighbor base stations, and report the neighbor base stations signal quality;
    Ground base station equipment, be used for receiving aircraft-position information and aspect change information and current base station signal quality and the neighbor base stations signal quality that described Airborne Terminal equipment reports, send described handover measurement request according to aircraft-position information to Airborne Terminal equipment, and according to aspect change information, aircraft-position information, current base station signal quality and neighbor base stations signal quality, carry out the handover from described current base station to neighbor base stations.
  9. 9. system according to claim 8, wherein, described Airborne Terminal equipment comprises:
    Current base station signal measurement and comparison module be used for to be measured the signal quality of current base station, and signal quality and the predetermined threshold of current base station compared;
    The neighbor base stations signal measurement module, be used for when the current base station signal quality is less than or equal to predetermined threshold, start voluntarily the measurement to the neighbor base stations signal, perhaps according to described handover measurement request, startup is to the measurement of neighbor base stations signal, and reports based on starting voluntarily and measure or start the neighbor base stations signal quality of measuring based on request.
  10. 10. system according to claim 9, wherein, described ground base station equipment comprises:
    The base station transceiver module is used for aircraft-position information and aspect change information and current base station signal quality and neighbor base stations signal quality that receiver mounted terminal equipment reports, and sends the handover measurement request;
    The handover measurement request sending module, determine that according to described aircraft-position information aircraft enters the switching preparation moment in current base station far point zone from current base station near point zone, and before this switching is prepared constantly, do not receive based on starting voluntarily in the situation of the neighbor base stations signal quality of measuring, send the handover measurement request to Airborne Terminal equipment.
  11. 11. system according to claim 10, wherein, described ground base station equipment also comprises:
    Measure startup determined property module, start attribute for the measurement of judging the neighbor base stations signal quality that Airborne Terminal equipment reports;
    Handover module, start when the measurement of judging the neighbor base stations signal quality belongs to voluntarily, judge further then whether flight attitude information change value surpasses threshold value, and time-out switches when flight attitude information change value surpasses threshold value, otherwise then announcement machine mounted terminal equipment switches; And start when the measurement of judging the neighbor base stations signal quality belongs to according to request, then relatively neighbor base stations signal quality and current base station signal quality, and when the neighbor base stations signal quality was higher than the current base station signal quality, announcement machine mounted terminal equipment switched.
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