CN113347640A

CN113347640A - System and method for realizing specific mode coverage by using aerial base station track scheduling

Info

Publication number: CN113347640A
Application number: CN202010100621.2A
Authority: CN
Inventors: 仲川
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-18
Filing date: 2020-02-18
Publication date: 2021-09-03

Abstract

The invention provides a system and a method for providing specific mode wireless signal coverage for a communication terminal by an air base station through track scheduling, and relates to the field of communication systems and unmanned aerial vehicles. The air network base station project is a communication network research hotspot in recent years, such as a star link plan of Google fire balloon/space exploration and the like, but the technical scheme of the high-altitude deep space has a plurality of problems of difficult deployment and the like. Compared with the prior art, the medium and low altitude unmanned aerial vehicle carrier air base station working in the near-ground space has high economical efficiency and flexibility, and can effectively make up for the insufficient coverage of the ground fixed communication network. Based on the position information and the service requirement information of the terminal, the air base station with the position scheduling capability carries out dynamic track scheduling and forms corresponding signal coverage meeting the service requirement. The technical scheme provided by the invention effectively utilizes the position adjusting capability of the aerial base station, achieves the aim of providing flexible and economic signal coverage and has the possibility of scale networking.

Description

System and method for realizing specific mode coverage by using aerial base station track scheduling

Technical Field

The invention relates to the field of communication systems and unmanned aerial vehicles, in particular to a system and a method for providing specific mode wireless signal coverage for a communication terminal by an unmanned aerial vehicle aerial base station through trajectory scheduling.

Background

A base station, i.e. a public mobile communication base station, is an interface device for a mobile device to access the internet, and is a form of a radio station, which is a radio transceiver station for information transmission with a mobile phone terminal through a mobile communication switching center in a certain radio coverage area. The construction of mobile communication base stations is an important part of the investment of mobile communication operators, and is generally carried out around the factors of coverage, call quality, investment benefit, difficult construction, convenient maintenance and the like. The communication base station is the most critical infrastructure in a mobile communication network, and its main function is to provide wireless coverage, i.e. to realize wireless signal transmission between a wired communication network and a wireless terminal.

Due to the fact that communication infrastructure cost is high, construction period is long, concepts of aerial base stations (hot air balloons/unmanned aerial vehicles and the like are used as carriers of base station equipment) are generated, coverage problems are solved through the aerial base stations, expensive optical cable laying and iron tower machine room construction can be avoided, and a means for deploying communication networks is provided for remote areas lacking network coverage or emergency communication. According to different implementation manners, the air base station generally provides coverage for common communication signals such as WIFI/GSM/LTE to the ground terminal, and is connected to the terrestrial communication network/satellite communication network in a backhaul manner such as a microwave (millimeter wave)/tether/satellite transceiver.

A well-known air network base station project mainly includes a Loon (a submarine bird plan, a repeater is lifted to a stratosphere through a hot air balloon and is continued for 100-180 days) of google and an Aquila (a sky eagle plan, an unmanned aerial vehicle is used for laser communication and is continued for 90 days) of a face book; and low earth satellite communication solutions from SpaceX, OneWeb, etc.

The Google fire balloon plan is a famous case, and the Google fire balloon plan plays countless fire balloons on an atmosphere stratosphere to form a wireless network, so that cheaper internet service is provided for more areas which are not connected with the network or have unstable network conditions, blind areas of the network service are filled, or the recovery of the network in areas with disasters and network breaks is assisted. These hot balloons can enter the atmosphere stratosphere, about 20 kilometers from the ground, which is twice the flight height of the aircraft. The stratospheric wind is generally stable with wind speeds between 5 and 20 miles per hour, and the wind direction varies from one elevation to another. The hot balloon floats in the air of the earth, the moving position is determined through a software algorithm, and then the hot balloon ascends and descends to a specific height and moves along with the wind direction to form a huge communication network.

The face-book "skyhawk" drone can achieve a single sustained flight time of up to 3 months. Which is longer in span than the boeing 737. It has achieved a flight speed of 40 km/h and can provide internet access services from the air to ground ranges of about 96.5 km in diameter using laser communication techniques and radio signals.

The star chain is a project of the space exploration technology company in the united states, and the space exploration technology company plans to build a 'star chain' network consisting of about 1.2 ten thousand satellites in space between 2019 and 2024, wherein 1584 satellites are deployed in a near-earth orbit at 550 kilometers above the earth, and the work starts from 2020.

The above communication platform is often difficult to popularize in practice, mainly because:

1. the loading capacity is stronger, and the flying height is high, the distance is far away, and the stagnant air operating time is relatively longer.

2. The device has the advantages of large volume, complex ground guarantee system, complex maintenance, high maintenance cost and high training guarantee requirement;

3. the requirement on emission and recovery conditions is high, and a special take-off and landing site is required;

4. lack of flexibility results in a short overall dead time;

compared with high-altitude/deep-space air base station schemes such as hot air balloons, large unmanned aerial vehicles and satellites, the medium and low-altitude unmanned aerial vehicle carrier air base station working in the near-earth space has high economical efficiency and flexibility and has the potential of large-scale networking application. The unmanned aircraft refers to an aircraft which is not operated by a pilot on the aircraft, and includes a remote control piloted aircraft, an autonomous aircraft, a model aircraft and the like, and the remote control piloted aircraft and the autonomous aircraft are collectively called unmanned planes.

In recent years, with breakthroughs in key technologies such as a direct current brushless motor, a high-energy lithium polymer and multi-rotor cooperative control, the micro multi-rotor unmanned aerial vehicle is mature day by day. Therefore, the airborne communication base station of the unmanned aerial vehicle, especially the airborne emergency base station realized based on the tethered unmanned aerial vehicle, becomes an important solution.

Mooring unmanned aerial vehicle is as high altitude basic station and the biggest difference of many rotor unmanned aerial vehicle lie in that the power supply mode is different, through the mooring line power supply, and mooring unmanned aerial vehicle platform mainly hovers around the fixed point, can not have too much complicated flight action.

A general multi-rotor unmanned aerial vehicle can only fly for 30 minutes to 1 hour, and the tethered multi-rotor unmanned aerial vehicle can continuously fly. Meanwhile, the antenna height can rise along with the flying height of the unmanned aerial vehicle, the coverage angle can be adjusted along with the rotating direction of the unmanned aerial vehicle, and large-area signal coverage can be effectively realized.

The nokia bell laboratory also provides an F-Cell, an unmanned aerial vehicle base station integrating a solar Cell module, realizes self power supply, self configuration and automatic connection to a network in a wireless mode, and immediately starts to transmit high-definition video after networking. Due to its flexibility (wireless), large capacity, low latency and scalability, the F-Cell will be able to continuously solve the difficulties faced by operators and enterprises in small base station and backhaul wiring, deployment and cost, etc., and is expected to be built in the more daily future wide area networks (5G NR, 4G LTE).

In fig. 1, a schematic diagram is depicted containing a tethered balloon base station and a drone base station, wherein the tethered balloon is connected to ground communications facilities via an opto-electric tether and provides signal coverage to ground terminals; the unmanned aerial vehicle aerial base station is connected with a ground communication facility through a microwave return, and is connected with a satellite through a satellite signal transceiver to provide signal coverage for a ground terminal; the satellite ground station is connected with a satellite through a satellite signal receiving and transmitting device and is connected with a ground communication network in a wired mode; and a ground terminal is positioned outside the signal coverage of the ground base station and is indirectly accessed to a ground communication network through the balloon air base station and the unmanned aerial vehicle air base station.

When a plurality of air base stations exist, signal interconnection among the air base stations can be established, and signals of the air base stations can be indirectly connected with a ground communication network through signal relay transmission of other air base stations.

The signal propagation characteristics based on the air base station are different from those of the traditional ground base station, and mainly come from the change of the characteristics such as the signal coverage/strength and the like caused by the position change/antenna direction of the air base station.

For example, the higher the position of the air base station, the larger the signal ground coverage, but the weaker the signal strength of the ground terminal, the lower the supportable information transmission rate. When the air base station of non-fixed position moves, the ground coverage area moves, and the signal strength of the ground terminal changes along with the movement of the relative position. Meanwhile, compared with the signal characteristic that non-line-of-sight propagation of the cellular network ground base station is dominant, the line-of-sight propagation possibility of the terminal and the air base station is greatly improved.

Meanwhile, the air base station is often applied to remote areas, and is different from service statistical stability formed by the existence of a large number of users in a town environment, and the occurrence positions and capacity requirements of services are dispersed and present strong randomness.

Therefore, based on the above analysis of the characteristics of the traffic and radio channels, an optimized network design with an over-the-air base station is required.

QoS (Quality of Service) refers to a network that can provide better Service capability for specified network communication by using various basic technologies, and is a security mechanism of the network, which is a technology for solving the problems of network delay and congestion. QoS guarantees are important for capacity-limited networks, especially for streaming multimedia applications such as VoIP and IPTV, which often require fixed transmission rates and are sensitive to delay.

User terminal services need different QoS guarantees according to types, and taking an LTE system as an example, service bearers thereof can be divided into two main categories: GBR (guaranteed Bit rate) and Non-GBR. By GBR, it is meant that the bit rate required by the bearer is allocated by the network "permanently" and constantly, and the corresponding bit rate is maintained even in the presence of a shortage of network resources. The mbr (maximum Bit rate) parameter defines the upper rate limit that the GBR bearer can reach under the condition of sufficient resources. The value of MBR may be greater than or equal to the value of GBR. In contrast, Non-GBR refers to the requirement that traffic (or bearers) should be subjected to a reduced rate in the case of network congestion, and can be established for a long time since Non-GBR bearers do not need to occupy fixed network resources. Whereas GBR bearers are typically established only when needed.

QCI (QoS Class identifier) is one of the most important QoS parameters in LTE systems, it is a quantity Class that represents the QoS characteristics that should be provided for this service, and the use of QCI on the interface instead of transmitting a set of QoS parameters is mainly to reduce the amount of control signaling data transmission on the interface and to make interconnection and interworking between different devices/systems easier in multi-vendor interconnection environments and roaming environments, and thus, a certain amount of processing behavior needs to be specified.

The network node selects a control bearer level packet forwarding mode (such as scheduling weight, admission threshold, queue management threshold, link layer protocol configuration, and the like) according to the QCI, and the control bearer level packet forwarding mode is configured to the access network node in advance by an operator.

Table 1 is a table excerpt for the QCI in table 6.1.7-a of 3GPP TS 23.203,

for each QCI value, parameters such as corresponding service type, priority, delay requirement, packet loss rate, typical service and the like are described.

For example:

QCI is 1, and is applied to GBR type service, the priority of the service is 2, the delay is not greater than 100ms, the packet loss rate is not greater than 1%, and a typical service is a voice call.

QCI is 5, and is applied to non-GBR type traffic, where the priority of the traffic is 1, the delay is not greater than 100ms, and the packet loss rate is not greater than 1%, and a typical traffic is IMS (IP Multimedia system) signaling.

TABLE 1

In the present invention, mainly related to changing the quality of the wireless channel between the base station and the terminal through the position change of the air base station to carry the communication transmission, the motion track of the air base station is limited by the capacity relation of the wireless channel returned by the air base station and the wireless channel to the user.

Shannon's formula, in a channel interfered by gaussian white noise, the maximum information rate C transmitted is determined by the following formula:

C＝W*log₂(1+S/N)(bit/s)

c is the limit value of the data rate, unit bit/s; w is the channel bandwidth in Hz; s is the signal power (watts) and N is the noise power (watts).

The S/N in the Shannon formula is the ratio of the power of the signal to the power of the noise, and is a dimensionless unit. Such as: 1000 (i.e., the signal power is 1000 times the noise power)

However, when discussing signal-to-noise ratio, it is often in units of decibels (dB). The formula is as follows:

SNR (Signal-to-noise ratio, in dB) 10lg (S/N)

The conversion is as follows: S/N is 10^ (SNR/10).

The formula shows that the channel capacity depends on the channel bandwidth and the system signal-to-noise ratio.

The shannon formula is a theoretical limit, and indicates that when the transmission rate is less than the channel capacity value, there is a channel transmission method to implement error-free transmission, the actual capacity of the wireless channel will be different according to the actual technology used (coding mode/modulation mode/multi-antenna technology selection, etc.) and the actual channel conditions (line of sight/non-line of sight/rain fog weather/occlusion reflection, etc.), the transmission condition parameters of the channel can be obtained according to the measurement of the channel reference signal, and the base station can select a set of actual transmission format parameters (bandwidth/power/modulation coding mode/antenna technology, etc.) according to the parameters obtained by channel measurement to ensure the service QoS requirements of the terminal.

In the process of accessing a terminal to a system, it is usually necessary to detect a synchronization signal sent by a base station, send an access signal, perform access operation with the base station, perform negotiation configuration of system service parameters, perform channel measurement according to a base station instruction, and finally transmit/receive service data according to scheduling of the base station, where, if no special statement is made, in the present invention, a relevant description is made with reference to a working procedure of a standard (3GPP TS 36.2xx series) of LTE (Long Term Evolution), and practical application is not limited to the working mode of LTE.

In the development history of land communication networks, methods for measuring channels of ground base stations at fixed positions and selecting transmission formats for various service types are developed in a mature manner, the position track of the base stations changes along with the introduction of air base stations, the fading characteristic/line-of-sight propagation characteristic and the like of wireless channels all change, the working mode of the existing air base stations (especially mooring type) is similar to that of the fixed position base stations, and mainly hovering/fixed points.

Disclosure of Invention

The invention provides a system and a method for providing wireless signal coverage of a specific mode for a communication terminal by an aerial base station by utilizing track scheduling.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention discloses a system for providing wireless signal coverage of a specific mode for a communication terminal by an air base station by utilizing track scheduling, which comprises:

the system comprises a communication terminal, an air base station and a track scheduler;

as shown in figure 2 of the drawings, in which,

the communication terminal and the air base station have a uniform wireless communication interface, and can carry out information transmission interaction.

The aerial base station flies under the instruction of the track scheduler, and the change of the wireless communication signal strength can be realized through the position change of the relative communication terminal.

The track scheduler is a logic function module and can exist on any entity capable of performing information interaction with the air base station, and the track scheduler schedules the motion track of the air base station through the terminal information received by the air base station, changes the coverage range of the air base station, changes the mode of the signal coverage strength of the communication terminal and meets the service requirement of the terminal.

For convenience of description, the air base stations are divided into two types according to function types, one type is the air base station (type A) for detecting terminal access, the air base station works at high altitude, the ground signal coverage is wide, but the coverage signal is weaker, the air base station is used for detecting terminal access and acquiring terminal service demand related information and low-rate service bearing, and the other type is the air base station (type B) for providing terminal service transmission capability, works in near-ground space, has a smaller coverage range, can provide strong signal coverage, is mainly used for bearing terminal high-rate service, and can also be used for detecting terminal access in the coverage area of the air base station. The classification is a logical concept classification, and an air base station in an actual system can simultaneously have two types of characteristics, and complete the function of carrying different types of services according to the specific channel conditions of track scheduling, or divide more types according to the service types, for example, the type a is divided into two subclasses of detection signal access and low-rate service carrying.

For a preset target area, one or more type-A air base stations for detecting terminal access can transmit downlink synchronous signals and broadcast and transmit system access parameters, and the signal coverage mode can be time continuous/discontinuous (whether the terminal can continuously communicate with the base station) or continuous or discontinuous (whether an area that the terminal can not communicate with the base station exists).

When the terminal detects the downlink synchronous signal of the base station, the terminal transmits an uplink access signal according to the system access parameter, and the terminal is connected with the air base station to access the communication system, and the air base station acquires the terminal information including the position information.

When terminal service occurs, the air base station evaluates the channel state, if the air base station meets the service transmission condition, the service transmission can be carried out, otherwise, the relevant information is sent to the track scheduler.

And the track scheduler schedules the motion track of the type B air base station, a service transmission channel which meets the transmission condition is built for the terminal service, the service transmission channel can be removed after the terminal service is transmitted, and the type B air base station acts according to a new scheduling instruction.

When the track scheduler schedules the movement track of the air base station, the position of the air base station can be dynamically changed by comprehensively considering the characteristics of services and channels, so that the channel characteristics of a return line of the air base station and a communication line to a terminal are changed, and the limiting conditions are met:

1, the capacity of the communication return line of the air base station to the ground communication network is not less than the sum of the service rates of all terminals connected with the air base station.

2, the capacity of the communication line of the air base station to the single terminal connected is not less than the traffic rate requirement of the terminal.

For the non-real-time service of the terminal, the data transmission from the aerial base station to the terminal and the data transmission to the communication network can be completed at different places of the movement track of the aerial base station, and in the transmission process, the aerial base station stores corresponding service data.

The track scheduler can record scheduling information (including pre-configured information such as channel propagation characteristic information related to places, no-fly zones and the like), and can use the recorded information to perform optimized track scheduling.

In the present invention, a single communication terminal is taken as an illustration example, and in practical application, service combinations formed by a plurality of communication terminals can be scheduled as a logical whole.

Therefore, the technical scheme provided by the invention effectively utilizes the position adjusting capability of the air base station, and forms a signal coverage mode meeting the service and design requirements according to the regional condition and the characteristics of the terminal service, thereby achieving the purpose of providing flexible and economic signal coverage.

The invention also discloses a method for providing the wireless signal coverage of the specific mode for the communication terminal by the aerial base station by using the track scheduling, which comprises the following steps:

as shown in figure 3 of the drawings,

301, the air base station sends downlink synchronous signal and broadcasts and sends system access parameter, the terminal sends uplink access signal according to the system access parameter after detecting the downlink signal of the base station, and connects with the air base station to access the communication system, the air base station obtains the terminal information including the position information,

step 302, the air base station provides service if it can meet the service requirement of the terminal, otherwise sends the information related to the service of the terminal requesting the service to the track scheduler,

step 303, the track scheduler schedules the air base station to enter the region range of the communication terminal, meets the required signal intensity, performs communication, and can record the scheduling information as the optimization of future track scheduling.

The service performing process may be that a single air base station works under the instruction of the track scheduler, or that a plurality of air base stations cooperatively work under the instruction of the track scheduler to share the requirement of the terminal service; from the perspective of the communication terminal, its different service requirements (access/communication signaling/communication services, etc.) may be assumed by one air base station, and possibly by different air base stations.

When scheduling the moving track of the aerial base station, the track scheduler comprehensively considers the service characteristics and the channel characteristics, and preconfigured information (such as no-fly zone/terrain characteristics), including the information of the location-related communication channel obtained from historical scheduling.

Drawings

FIG. 1 is a schematic diagram of a prior art base station over the air;

FIG. 2 is a schematic diagram of the system of the present invention;

FIG. 3 is a flow chart of the method of the present invention;

FIG. 4 is a schematic diagram of an embodiment of two aerial base stations and a ground terminal of the present invention;

FIG. 5 is a schematic diagram of an embodiment of flexibly adjusting multiple coverage modes of a desert highway;

FIG. 6 is a schematic diagram of an embodiment of step-by-step transmission of data by a non-real-time service according to a track;

fig. 7 is a schematic diagram of an embodiment of the present invention containing predicted information.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Fig. 4 is a schematic diagram of an embodiment of the present invention in which two air base stations and a ground communication terminal complete a one-time high-rate service communication service; as described in relation to figure 4 of the drawings,

in an initial state, the air base station 1 and the air base station 2 send synchronous signals and system parameter data to the ground, the two base stations have different ground coverage areas (partial overlapping), a terminal is positioned in the coverage area of the air base station 1, and the wireless channel condition meets the requirements of signal access detection and signaling parameter transmission;

step 401, the terminal sends an access request according to the system parameters, and is detected and received by the air base station 1, the terminal and the air base station 1 exchange service related signaling, at this time, the air base station 1 can obtain the position information of the terminal by a positioning method:

for example, if the terminal has a satellite positioning device, the address information may be directly reported, or the base station determines the transmission and reception angles of the base station and the terminal by using the directional characteristics of the antenna transmission/reception beams, and the region where the terminal is located may be obtained by combining the flight altitude and the ground map information.

Step 402, the terminal requests a high-speed transmission service, the air base station 1 analyzes the service request of the user, and if the current wireless channel can not meet the transmission request, the service request message (containing the address information of the terminal) is sent to the track scheduler (which can be arranged in the ground communication network or a certain air base station, and can meet the communication request with the air base station).

Step 403, the track scheduler schedules the air base station 2 to fly to the air of the terminal site, and selects the position of the air base station to meet the limiting conditions: 1, the return rate of the air base station 2 and the ground communication network satisfies the service rate of the same terminal (in this example, only one terminal needs to be considered, otherwise, the rate requirement of integrating other terminals and services needs to be considered) 2, and the wireless channel of the air base station 2 and the terminal satisfies the rate requirement of terminal service transmission (if a plurality of terminals exist at the same time, the respective rate requirements of the plurality of terminals need to be satisfied).

The transmission condition parameters of the channel can be obtained by measuring the channel reference symbols according to the prior art, and taking the LTE system as an example, whether the signal conditions satisfy the service transmission rate can be seen whether the parameters measured by the channel can satisfy the requirements of the corresponding QCI.

In step 404, the air base station 2 establishes a communication connection with the terminal, transmits the high-speed service of the terminal,

it can be seen that, unlike the fixed coverage mode of the ground communication network, the air base station can perform the scheduling of the trajectory according to the requirement to form a specific coverage mode with dynamic change, and the scheduling scheme can integrate multiple factors (including the power supply of the carrier) to form a coverage scheme meeting the communication requirement of the terminal through the actual operation number and different positions of the air base station.

Specifically, what kind of trajectory scheduling is adopted can be selected in consideration of economic/service indexes, and as shown in the embodiment shown in fig. 5, on a section of desert highway without coverage of a communication network, communication terminals on vehicles can form different coverage modes according to service characteristics at different time intervals:

as shown in fig. 5A, there is basically no stable communication requirement at night, but to ensure possible vehicle risk avoidance requirement, the air base station cruises through the whole road section at preset time intervals, so as to ensure that the communication terminal has time to communicate when an emergency occurs, and at this time, the covered time period may be discontinuous for one place.

As shown in fig. 5B, when a local demand hot spot occurs (for example, when a car accident occurs and needs to be handled), adjacent air base stations may be scheduled to carry out high-rate service bearer at the hot spot, and the ground coverage of a plurality of air base stations may be discontinuous, for example, the air base station at the hot spot is covered in a small range at the car accident, and the air base station at the high altitude continues to cruise through the rest of the road segments according to the original trajectory plan.

As shown in fig. 5C, when the traffic density increases during the day, the whole highway service tends to be uniform and stable, and at this time, a plurality of air base stations cooperate to perform networking, provide time/place continuous high-speed service carrying capacity for all road sections, and may adopt a hovering and timing replacement manner or a cruise coverage manner by adopting a uniformly planned dynamic route.

Fig. 6 illustrates a specific embodiment for carrying non-real-time services, for the non-real-time services, since the time requirement can be understood as infinite (or in actual operation, the time delay requirement of data transmission can be compared with the one-time cruising time of the air base station), the capacity requirement of the air base station for transmitting the wireless channel approaches to 0, so that the air base station can establish communication connections with the ground communication network and the terminal respectively at different positions of the movement track (or a data storage chip entity transfer mode after the air base station is landed) to complete the step-by-step data transmission.

For example, in a wide area, data terminals (or a group of adjacent terminals) with known positions are distributed to perform environment measurement and store measurement data which needs to be reported regularly, the aerial base station cruises the whole area according to a preset position track, communicates with the data terminals in the area to acquire the measurement data and temporarily stores the measurement data uploaded by the terminals (at this moment, the aerial base station may be separated from the connection range with the ground communication network or maintain low-speed connection with the ground communication network); and transmitting the measurement data of the terminal to the ground communication network again until the cruising track returns to the connection range of the ground communication network return link (or the high-speed connection is recovered). The downloading non-real-time service data of the ground terminal can be obtained in the same way.

In the present invention, the specific wireless transmission method is not limited, and for example, in this example, the air base station may perform transmission by using a WLAN technology with small coverage, or may perform transmission by using a wide area network transmission technology such as GSM (2G)/CDMA (3G)/LTE (4G)/NR (5G), or an internet-of-things specific transmission technology system such as NB-IOT/LORA/Bluetooth.

In the present invention, a single communication terminal is taken as an illustration, and in practical application, the trajectory scheduling arrangement may be performed by a service combination formed by a plurality of communication terminals as a whole.

Fig. 7 illustrates an embodiment containing predicted information, which provides services for a terminal through analysis of a historical scheduling record, and usually according to the historical scheduling information, a flight trajectory a of a base station may meet requirements, but during this scheduling, there is temporarily added restricted configuration information of a no-fly zone, the flight trajectory a is in the restricted zone, and therefore is changed to a flight trajectory B below the height of the no-fly zone for performing services, and a trajectory scheduler records relevant detection information of the flight trajectory B, such as a shelter/wireless channel characteristics/energy consumption, and the like, as an analysis basis for future scheduling.

The invention also provides a method for providing the wireless signal coverage of the specific mode for the communication terminal by the aerial base station by using the track scheduling, which comprises the following steps:

as shown in figure 3 of the drawings,

The service process may be that a single air base station works under the instruction of the track scheduler, or that a plurality of air base stations work cooperatively under the instruction of the track scheduler to share the work of the terminal service requirement; from the perspective of the communication terminal, its different service requirements (access/communication signaling/communication services, etc.) may be assumed by one air base station, and possibly by different air base stations.

When scheduling the moving track of the air base station, the track scheduler comprehensively considers the service characteristics and the channel characteristics, and preconfigured information (such as no-fly zone/terrain characteristics) including the location-related communication channel information obtained from historical scheduling.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A system for an airborne base station to provide mode-specific wireless signal coverage to a communication terminal using trajectory scheduling, the system comprising:

a communication terminal, an airborne base station, a trajectory scheduler,

the air base station and the communication terminal carry out information interaction, the position is adjusted under the scheduling of the track scheduler, the coverage characteristics (time/region continuity and signal strength) of a wireless channel are changed, and the service of the terminal is borne.

2. The system of claim 1, wherein the air base station can obtain the service information and the location information of the terminal and send the information to the track scheduler, and the track scheduler plans the track of the air base station to provide the service for the terminal.

3. The system according to claim 1, wherein for the communication traffic requiring continuous transmission, the trajectory scheduler schedules the moving trajectory of the air base station, changes the channel characteristics of the backhaul of the air base station and the communication line to the terminal, and satisfies the constraint: the capacity of the communication return line of the air base station to the ground communication network is not less than the sum of the service rates of all the terminals connected with the air base station, and the capacity of the communication line of the air base station to the single terminal connected with the air base station is not less than the service rate requirement of the terminal.

4. The system of claim 1, wherein the track scheduler is capable of recording scheduling information (including pre-configured information) and using the recorded information to make track scheduling decisions.

5. The system of claim 1, wherein the service requirements of the communication terminal can be assumed by one air base station or by different air base stations respectively.

6. The system of claim 1, wherein the plurality of air base stations are layered/networked according to altitude/coverage to provide signal coverage for the communication terminal according to different service requirements.

7. The system of claim 1, wherein the signal coverage pattern can be continuous/discontinuous in time, continuous/discontinuous in coverage, and can be dynamically changed by adjusting the position of the over-the-air base station according to the service requirement.

8. The system of claim 1, wherein the air base station temporarily stores non-real-time traffic data of the communication terminal, and establishes communication connections with the ground communication network and the terminal respectively at different positions of the motion trajectory to complete the step-by-step transmission of the data.

9. The system of claim 1, wherein the service of the communication terminal can be a service of a single entity communication terminal or a service combination of a plurality of entity communication terminals.

10. A method for an airborne base station to provide mode-specific wireless signal coverage for a communication terminal using trajectory scheduling, comprising the steps of: