CN105979603B - UAV Board Data link dispatching method based on TD-LTE technology towards letter flow QoS guarantee - Google Patents
UAV Board Data link dispatching method based on TD-LTE technology towards letter flow QoS guarantee Download PDFInfo
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Abstract
The invention discloses a kind of based on UAV Board Data link dispatching method of the TD-LTE technology towards letter flow QoS guarantee: being cooperated under the control of a variety of signalings realization by radio-resource-configuration module, channel status probe module and the information flow recovery module at the information flow generation module of UAV Communication terminal, classification map module, scheduler module and channel status probe module and eNodeB.The present invention uses 4G communication network TD-LTE, propose a kind of unmanned plane information flow classification map method and dispatching algorithm, the various information that control administrative center can be returned in flight course for unmanned plane provides differentiation and transmits service, provides effective link guarantee for the reliable acquisition information flown and obtain high quality of unmanned plane.
Description
Technical field
The invention belongs to air vehicle technique fields, are related to a kind of dispatching method, especially a kind of to be based on TD-LTE technological side
To the Small Civil UAV Board Data link dispatching method of a variety of letter flow QoS guarantees.
Background technique
Small Civil unmanned plane structure is simple, figure is small and exquisite, low in cost；Its flight is low with maintenance cost, is not fearful evil
Bad environment；Using flexible, it is easy to carry, do not need dedicated airport and large-scale ground equipment, therefore, the following Small Civil nobody
Machine will obtain great application in the fields such as natural calamity prevention and processing, town and country construction and planning, scientific observation, frontier policeman
Market.
UAV Communication system is that unmanned plane and control administrative center carry out real time communication as one of important subsystem,
State of flight and information are fed back, the key point of control administrative center's order is received.It is based on currently, UAV system mainly uses
Satellite, Wi-Fi, bluetooth or purple honeybee (Zigbee) wireless communication technique, have that transmission range is limited, transmission rate is not high, real
The disadvantages of when property is poor, it is difficult to meet the needs of civilian unmanned plane future development.With 4G mobile communication technology development and " mutually
The rise of networking+" ideological trend has some scholars and research institution and is considered as 4G network-control realization UAV Communication, example
Such as, Md.Arafatur Rahman can be used for the UAV Communication system of snowslide rescue using 4G WiMAX Technology design；The U.S.
AT & T Corp. announces to cooperate to test and optimize performance when unmanned plane connect 4G LTE network with Intel company；The country also has
Manufacturer, such as China Mobile also begin trying with using 4G network-control unmanned plane.To have the TD- of national independent intellectual property right
For LTE technology, it can support the MPS process up to 100km radius；It can be mentioned for the high velocity mobile users lower than 350km/h
For being more than the access service of 100km/s；Unidirectional transmission time delay is lower than 5ms inside its user plane, controls plane from sleep state
Transit time to state of activation is lower than 50ms, and the transit time from resident state to state of activation is lower than 100ms；Can flexibly it match
Set the various bandwidth from 1.25MHz to 20MHz.When bandwidth is 20MHz, TD-LTE system can reach lower behavior 10.8bit/
The availability of frequency spectrum of Hz, upper behavior 5.4bit/Hz are capable of providing the typical peak speed of lower behavior 100Mb/s, upper behavior 50Mb/s
The system peak rate of rate and lower behavior 200Mb/s, upper behavior 100Mb/s.Meanwhile the multiple antennas that TD-LTE system uses
Technology can improve the user performance of cell edge by figuration, improve cell capacity and anti-interference ability.Therefore, by 4G technology
Introduce Small Civil UAV Communication system, be expected to optimization system transmission performance significantly, be unmanned plane and control administrative center it
Between multimedia interactively communicate entirely good link basis be provided.
Table 1 has communication technology transmission performance and compares
| QoS | Satellite communication | Wi-Fi | Zigbee | 4G LTE/WiMAX |
| Message transmission rate > 1Mbps | It is | It is | It is no | It is |
| Transmission range > 1km between node | It is | It is no | It is | It is |
| Mobility | It is | It is | It is | It is |
| Low time delay shake | It is | It is | It is no | It is |
| Price | It is expensive | It is cheap | It is cheap | It is moderate |
Performance simulation assessment is carried out to 4G transmission link dispatching algorithm currently, having some documents, however, based on 4G's
UAV Communication system research still in its infancy, rarely has and studies transmission link scheduling strategy specifically for it.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, one kind is provided based on TD-LTE technology towards letter flow
The UAV Board Data link dispatching method of QoS guarantee.
The purpose of the present invention is achieved through the following technical solutions:
This UAV Board Data link dispatching method based on TD-LTE technology towards letter flow QoS guarantee, is led to by unmanned plane
At information flow generation module, classification map module, scheduler module and channel status probe module and eNodeB at letter terminal
Radio-resource-configuration module, channel status probe module and information flow recovery module cooperate under the control of a variety of signalings it is real
It is existing, comprising the following steps:
1) information flow classification map:
Collected application-level information stream is forwarded to classification map by the information flow generation module at UAV Communication terminal
Classification map is carried out in module；
2) ascending wireless resource is requested:
Scheduling instance, the scheduler module at UAV Communication terminal are sent to the radio-resource-configuration module at eNodeB
Row radio resource request signaling, the sending cycle of ascending wireless resource demand signalling and its position in subframe are by eNodeB
Radio-resource-configuration module configure determine；
3) uplink signal-channel quality detects:
When there is information flow grouping to need to dispatch, scheduler module at UAV Communication terminal can be to itself channel status
Detecting module sends ascending wireless resource demand signalling, and triggers itself channel status probe module to the channel at eNodeB
State detection module periodically sends channel detection signaling, and the channel status probe module at eNodeB is by the channel detection
The Sounding Reference Signal of signaling bear is compared with known signal, to know the quality of current up channel；
4) radio resource allocation:
Radio-resource-configuration module at eNodeB is according to user identifier and data to be transferred amount to UAV Communication terminal
Locate information flow to be scheduled and carry out radio-resource-configuration, and user-radio-resource-configuration result is believed by radio-resource-configuration
The scheduler module being sent at UAV Communication terminal is enabled, to inform scheduler module can be in which which carrier wave upload of time
Transmission of data, and the Modulation and Coding Scheme used；
5) information flow HOL packet scheduling:
Scheduler module at UAV Communication terminal caches team according to user-radio-resource-configuration result, various information stream
HOL grouping, QCI multi-level weight and delay performance weight calculation difference information flow, user and radio resource configure in column
When dispatch weight function ψl,n,k(t) value is the right that the maximum HOL grouping of functional value assigns priority scheduling；
6) information flow restores:
Various information flow point group to be scheduled is sequentially forwarded at eNodeB by the scheduler module at UAV Communication terminal
Information flow recovery module, information flow recovery module according to bound in each grouping flow identifier, user identifier with
And the radio-resource-configuration result carried in radio-resource-configuration signaling is packaged the grouping received, framing, it is final real
The transmission of existing various information stream.
Further, above step 1) specifically:
Firstly, being the grouping imparting phase in every category information stream buffer queue according to the QCI grade in LTE/SAE protocol frame
The QCI multi-level weight answered；
Secondly, being grouped in the waiting time delay in buffer queue according to various information stream buffer queue squadron head, its phase is assigned
The delay performance weight answered；
Finally, being grouped user bound identifier and flow identifier for each information flow.
Further, above step 2) in, the scheduler module at UAV Communication terminal is in ascending wireless resource request process
The data volume and user identifier that the middle radio-resource-configuration module needed to tell at eNodeB to be transmitted.
Further, above step 3) in, the channel status probe module at eNodeB will be to radio-resource-configuration module week
Send to phase property updated up channel quality mark signaling, thus notification stream when dispatching available radio resource with gram
Take the time variation of wireless channel.
Further, above step 5) in, scheduler module at UAV Communication terminal according to first in, first out sequential scheduling
Grouping in same information flow buffer queue.
Further, the dispatch weight function of above-mentioned UAV Communication terminal is according to identified below:
By PF weight factorIntroduce dispatch weight function ψl,n,k(t) it in, enablesMeet (4) formula:
Wherein, Rn,kIf being (t) that n-th of UAV Communication end message stream of t moment is forwarded to by k-th of RB
The message transmission rate expectation of eNodeB,It is last moment i.e. n-th of UAV Communication end message stream of t-1 moment
Average data transfer rate；Wherein,It is given by:
Wherein, RnIt (t) is momentary data transfer rates of n-th of UAV Communication terminal in t moment, α is regulatory factor
And it is given by:
Wherein, TWFor the time window being had an impact to user fairness；
By CQI weight factor ωlIntroduce dispatch weight function ψl,n,k(t) in, ω is enabledl∈ (0,1] meet (7) formula:
It is high that formula (7) guarantees that the scheduler module at UAV Communication terminal is always CQI priority in classification map module
HOL grouping distributes biggish CQI weight factor, and is that the low HOL grouping of CQI priority distributes lesser CQI weight factor, from
And assign possess higher CQI weight factor HOL grouping obtain priority scheduling right, thus for different delay require and
The information flow that packet loss requires provides preliminary QoS transmission and guarantees；
For video traffic and audio service, by Delay Guarantee factor ωl,n(t) dispatch weight function ψ is introducedl,n,k(t)
In, enable ωl,n(t) ∈ (0,1] meet (8) formula:
In formula (8), TlUAV Communication terminal classification map module caching is grouped in for l grades of QCI information flows to be dispatched
Maximum waiting delay requirement in queue, τl,n(t)∈(0,Tl] it is l grades of QCI of n-th of UAV Communication terminal of scheduling instance t
Information flow HOL to be dispatched is grouped in the waiting time in buffer queue, Δ Tl∈(0,Tl] between the scheduled guard time of system
Every being typically set to frame length, i.e. interval between scheduling twice；If Δ Tl≤Tl-τl,n(t), i.e. τl,n(t)∈(0,Tl-Δ
Tl], then the waiting time of HOL grouping can satisfy delay requirement；If Δ Tl> Tl-τl,n(t), i.e. τl,n(t)∈(Tl-Δ
Tl,Tl], then the waiting time of HOL grouping will exceed time delay restriction, and dispatching priority highest, scheduler module should assign it
Obtain the right of priority scheduling；
Dispatch weight function ψ suitable for UAV Communication terminall,n,k(t) ∈ (0,1] can be provided by formula (9):
Each scheduling instance, scheduler module is according to formula (9) in available UAV Communication terminal set, radio resource to be allocated
Matching primitives are carried out between set of blocks and HOL grouping set to be dispatched, are searched out corresponding with maximum dispatch weight functional value
Radio resource matching identification symbol, to transmit the specific information stream of relative users on corresponding wireless resource block.
The invention has the following advantages:
The present invention uses 4G communication network TD-LTE, propose a kind of Small Civil towards much information stream QoS guarantee without
Man-machine uplink scheduling method, this method propose a kind of unmanned plane information flow classification map method and dispatching algorithms, can be
Unmanned plane returned in flight course control administrative center various information provide differentiation transmission service, be unmanned plane can
Acquisition information by flying and obtaining high quality provides effective link and guarantees.
Detailed description of the invention
Fig. 1 is Small Civil UAV Communication system schematic；
Fig. 2 is that UAV Board Data link of the present invention dispatches block diagram；
Fig. 3 is TD-LTE system wireless frame structure figure；
Fig. 4 is that audio information stream packet loss rate compares figure；
Fig. 5 is that video stream packet loss rate compares figure；
Fig. 6 is that UAV Communication terminal fairness compares figure.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
Referring to Fig. 1, when unmanned plane needs collected various information flows returning to nothing by TD-LTE public network or private network
When Human-machine Control administrative center, towards the Small Civil UAV Board Data link dispatching party of much information stream QoS guarantee in MAC layer
Method as shown in Fig. 2, this method by the information flow generation module of UAV Communication terminal, classification map module, scheduler module and
Radio-resource-configuration module, channel status probe module and information flow at channel status probe module and eNodeB are restored
Module cooperates realization under the control of various signalings, mainly comprises the steps that
1) information flow classification map:
Collected various application-level information streams are forwarded to classification by the information flow generation module at UAV Communication terminal
Classification map is carried out in mapping block, firstly, being that every category information stream caches team according to the QCI grade in LTE/SAE protocol frame
Grouping in column assigns corresponding QCI multi-level weight (referring to table 2)；Secondly, according to various information stream buffer queue squadron head
(HOL) the waiting time delay being grouped in buffer queue assigns its corresponding delay performance weight；Finally, also needing as each information
Flow point group binding user identifier and flow identifier.
The QCI hierarchy mapping of 2 Small Civil unmanned plane of table acquisition information
2) ascending wireless resource is requested:
Scheduling instance, the scheduler module at UAV Communication terminal are sent to the radio-resource-configuration module at eNodeB
Row radio resource request signaling, the sending cycle of the signaling and its position in subframe determine by upper-layer configured, scheduler module
Need to tell the data volume oneself to be transmitted of radio-resource-configuration module at eNodeB in ascending wireless resource request process
And user identifier.
3) uplink signal-channel quality detects:
When there is information flow grouping to need to dispatch, scheduler module at UAV Communication terminal can be to itself channel status
Detecting module sends ascending wireless resource demand signalling, and triggers the module to the channel status probe module period at eNodeB
Property send channel detection signaling, the channel status probe module at eNodeB can by the channel detection of the signaling bear with reference to believe
It number is compared with signal known to oneself, to accurately know the quality of current up channel.To overcome wireless channel
Time variation, the channel status probe module at eNodeB will periodically send updated uplink to radio-resource-configuration module
Channel quality identifies signaling, to further inform available radio resource when the scheduling of its information flow.
4) radio resource allocation:
Radio-resource-configuration module at eNodeB is according to user identifier and data to be transferred amount to UAV Communication terminal
Locate information flow to be scheduled and carry out radio-resource-configuration, and user-radio-resource-configuration result can be passed through radio-resource-configuration
Signaling is sent to the scheduler module at UAV Communication terminal, to inform scheduler module can be on which carrier wave of which time
Transmit data, and the Modulation and Coding Scheme used.
5) various information stream HOL packet scheduling:
Scheduler module at UAV Communication terminal caches team according to user-radio-resource-configuration result, various information stream
HOL is grouped QCI multi-level weight in column and delay performance weight calculation information flow-user-wireless resource scheduling configuration function takes
Value is always the right that the maximum HOL grouping of functional value assigns priority scheduling, it is notable that scheduler module will be according to elder generation
Enter the grouping in the same information flow buffer queue of sequential scheduling first gone out.
6) information flow restores:
Various information flow point group to be scheduled is sequentially forwarded at eNodeB by the scheduler module at UAV Communication terminal
Information flow recovery module, the module is according to the flow identifier, user identifier and wireless money bound in each grouping
The radio-resource-configuration result carried on the configuration signal of source is packaged the grouping received, framing, finally realizes all kinds of letters
Cease the high-quality transmission of stream.
The dispatch weight function determination of UAV Communication terminal of the invention is described in detail below:
TD-LTE system wireless frame structure is as shown in Figure 3.In TD-LTE system, 1 radio frames includes that 10 subframes are total
10ms, each subframe is divided into 2 time slots in the time domain, and each time slot includes 7 SC-FDMA symbols, then by more on frequency domain
A sub- carrier wave composition.With 7 SC-FDMA symbols every in time domain in a subframe, every 12 subcarriers are unit on frequency domain
Resource block is known as a RB.RBs sum in one subframe is determined by system uplink bandwidth.Practical uplink scheduling is exactly wireless money
Source configuration process, the purpose is to the RBs in a subframe is distributed to the more of multiple UAV Communication terminals according to dispatching algorithm
Information flow, and the RBs that each UAV Communication terminal obtains is continuously distributed on frequency domain.Scheduling instance, unmanned plane are logical
Scheduler module at letter terminal needs to search for best matching result for RB, unmanned plane terminal, various information stream, so that system obtains
It while maximum throughput, can guarantee user fairness, and meet the QoS demand of various information stream, however, this optimal wireless
Resource allocation problem has proven to NP-Hard problem, therefore needs to be studied according to UAV Communication system features towards a variety of
The Small Civil UAV Board Data link dispatching algorithm of information flow QoS guarantee.
It is assumed that system has N number of UAV Communication terminal, and scheduling instance has K RB that can carry various information stream, enables nothing
The resource matched identifier C of linel,n,k(t) meet:
(3) formula shows that scheduling instance, each RB are only capable of distributing to 1 information flow in 1 UAV Communication terminal.
Scheduling instance t ', if met:
Then have:
Cl′,n′,k′(t ')=1 (3)
Wherein, scheduling instance t, if being l's by the CQI grade at n-th of UAV Communication terminal classification map module
HOL grouping is sent to eNodeB by k-th of RB, then it is ψ that the HOL, which is grouped corresponding dispatch weight function,l,n,k(t).When wireless
When resource matched identifier value meets (3) formula, that is, show the scheduling mould at a UAV Communication terminal of scheduling instance t ' the n-th '
Block will upload the l ' articles information flow to eNodeB on kth ' a RB.
The performance of 3 three kinds of typical deployments algorithms of table compares
| Dispatching algorithm | User fairness | Channel adaptability | Delay Guarantee | Throughput of system | Complexity |
| MAX C/I | Difference | It is good | Difference | Highest | It is smaller |
| RR | It is good | Difference | Difference | It is minimum | It is small |
| PF | Preferably | Preferably | It is good | It is higher | It is larger |
Suitable for TD-LTE mobile communications network typical deployments algorithm there are three types of, be poll (RR) algorithm, maximum respectively
Carrier/interface ratio (MAX C/I) algorithm and fair (PF) algorithm of ratio, performance compares referring to table 3, since PF algorithm can be in user
Good tradeoff is made between fair and spectrum efficiency, therefore uses for reference PF algorithm for PF weight factorIntroduce dispatch weight letter
Number ψl,n,k(t) it in, enablesMeet (4) formula:
Wherein, Rn,kIf being (t) that n-th of UAV Communication end message stream of t moment is forwarded to by k-th of RB
The message transmission rate expectation of eNodeB,It is last moment i.e. n-th of UAV Communication end message stream of t-1 moment
Average data transfer rate.Rn,k(t) value is bigger, orBe worth it is smaller, thenBe worth it is bigger, show n-th nobody
It is bigger that machine terminal obtains a possibility that k-th of RB, whereinIt is given by:
Wherein, RnIt (t) is momentary data transfer rates of n-th of UAV Communication terminal in t moment, α is regulatory factor
And it is given by:
Wherein, TWFor the time window being had an impact to user fairness.
Small Civil unmanned plane is main by the typical information that TD-LTE mobile communications network returns to control administrative center
Including three classes business: Flight Condition Data information, audio-frequency information and video information.Table 2 lists system to these three types of typical industry
The hierarchy mapping situation of business, wherein the flight of the safety and steady of Flight Condition Data information and unmanned plane is closely related, therefore has
Highest QCI classification, i.e. l=1, and audio-frequency information and video information are then that current unmanned plane carries out needing to pass in real time when information collection
Defeated main business type, respectively corresponds l=2 and l=4, and other QCI grades are then to retain grade, for it is other increase newly it is special
The hierarchy mapping of business.By CQI weight factor ωlIntroduce dispatch weight function ψl,n,k(t) in, ω is enabledl∈ (0,1] meet (7)
Formula:
It is high that formula (7) can guarantee that the scheduler module at UAV Communication terminal is always CQI priority in classification map module
HOL grouping distribute biggish CQI weight factor, and be that the low HOL grouping of CQI priority distributes lesser CQI weight factor,
To assign the right for the HOL grouping acquisition priority scheduling for possessing higher CQI weight factor, thus for different delay requirement
The information flow required with packet loss provides preliminary QoS transmission and guarantees.
Since video traffic and audio service have a more harsh requirements of real time, therefore by Delay Guarantee factor ωl,n
(t) dispatch weight function ψ is introducedl,n,k(t) in, ω is enabledl,n(t) ∈ (0,1] meet (8) formula:
In formula (8), TlUAV Communication terminal classification map module caching is grouped in for l grades of QCI information flows to be dispatched
Maximum waiting delay requirement in queue, τl,n(t)∈(0,Tl] it is l grades of QCI of n-th of UAV Communication terminal of scheduling instance t
Information flow HOL to be dispatched is grouped in the waiting time in buffer queue, Δ Tl∈(0,Tl] between the scheduled guard time of system
Every being typically set to frame length, i.e. interval between scheduling twice.If Δ Tl≤Tl-τl,n(t), i.e. τl,n(t)∈(0,Tl-Δ
Tl], then the waiting time of HOL grouping can satisfy delay requirement, and τl,n(t) shorter, dispatching priority is lower；Such as
Fruit Δ Tl> Tl-τl,n(t), i.e. τl,n(t)∈(Tl-ΔTl,Tl], then the waiting time of HOL grouping will exceed time delay restriction,
Its dispatching priority highest, scheduler module should assign its right for obtaining priority scheduling.Therefore, ωl,nIt (t) will be further tool
The information flow for having different delay to require provides better real-time Transmission and guarantees.
In summary, suitable for the dispatch weight function ψ of UAV Communication terminall,n,k(t) ∈ (0,1] can be given by formula (9)
Out:
Each scheduling instance, scheduler module all can be according to formulas (9) in available UAV Communication terminal set, to be allocated wireless
Matching primitives are carried out between resource set of blocks and HOL grouping set to be dispatched, are searched out opposite with maximum dispatch weight functional value
The radio resource matching identification symbol answered, to transmit the specific information stream of relative users on corresponding wireless resource block.
Verification experimental verification:
Using LTE-Sim emulation platform to the Small Civil based on TD-LTE technology towards much information stream QoS guarantee without
Man-machine uplink scheduling strategy carries out simulating, verifying.Simulating scenes are as shown in Figure 2: radius of society 1km, including 1
The frame UAV Communication terminal of eNodeB and 5 to 10.Wherein, eNodeB is located at center of housing estate position, and unmanned plane during flying mode is set
For Way-Point model, travel speed is set as 30km/h.In addition to the Flight Condition Data information for guaranteeing unmanned plane smooth flight,
Each UAV Communication terminal also uploads two category information streams and audio-frequency information and video information simultaneously.Using opening/closing Markov
Modeling VoIP flow, using video test sequence " Highway.yuv " analog video stream.Simulation time is set as 100s, often
Secondary simulation process at least carries out 10 times, and final result is averaged.
CQI grade is provided for 1 grade and with constant with the closely related data information of state of flight since system is always
The dispatch service of transmission rate, and this type of information data volume is little, therefore total energy obtains best scheduled transmission service, dimension is only right
The video information that the audio-frequency information and QCI grade that QCI grade is 2 grades are 4 grades carries out Performance Evaluation.Figure 4 and figure 5 respectively show
The packet loss rate performance histogram of audio information stream and video stream.It can be seen that with cell UAV Communication terminal
Several is continuously increased, and system uplink load is increasing, and the grouping packet loss of two kinds of algorithms increases therewith.Due to audio-frequency information
The QCI grade of stream is higher than video stream and transmission rate is lower than video stream, therefore the audio information stream of two kinds of algorithms is grouped
Loss Rate is very low and within 1%, is significantly less than video stream packet loss rate.Since proposed algorithm can be that will surpass
The HOL grouping of latency period assigns the right of priority scheduling, when there is HOL grouping to will exceed time delay restriction, this point out
Group can preferentially obtain RB and be uploaded, therefore, for audio information stream and video stream, it is proposed that algorithm can
The packet loss rate performance for being better than PF algorithm is obtained, so that the acquisition for unmanned plane uplink communication information provides preferably guarantor in real time
Card.Fig. 6 gives two kinds of proposed algorithm justice indexes and compares, and fair index shows that the fairness of system user is better closer to 1,
Proposed algorithm known in figure is slightly below proportional fair algorithm, this, which is proposed algorithm, provides real-time Transmission for information flow and guarantee to pay
Necessary expense, but still can guarantee system user in terms of radio resource acquisitions with preferable fairness.
Claims (5)
1. a kind of UAV Board Data link dispatching method based on TD-LTE technology towards letter flow QoS guarantee, which is characterized in that by
Information flow generation module, classification map module, scheduler module and channel status probe module at UAV Communication terminal, and
Radio-resource-configuration module, channel status probe module and information flow recovery module at eNodeB is under the control of a variety of signalings
Cooperation is realized, comprising the following steps:
1) information flow classification map:
Collected application-level information stream is forwarded to classification map module by the information flow generation module at UAV Communication terminal
Middle carry out classification map；
2) ascending wireless resource is requested:
Scheduling instance, scheduler module at UAV Communication terminal to the radio-resource-configuration module at eNodeB send uplink without
Line resource request signaling, the sending cycle of ascending wireless resource demand signalling and its position in subframe by eNodeB nothing
The configuration of line resource configuration module determines；
3) uplink signal-channel quality detects:
When there is information flow grouping to need to dispatch, scheduler module at UAV Communication terminal can be to itself channel status probe
Module sends ascending wireless resource demand signalling, and triggers itself channel status probe module to the channel status at eNodeB
Detecting module periodically sends channel detection signaling, and the channel status probe module at eNodeB is by the channel detection signaling
The Sounding Reference Signal of carrying is compared with known signal, to know the quality of current up channel；
4) radio resource allocation:
Radio-resource-configuration module at eNodeB is according to user identifier and data to be transferred amount to waiting at UAV Communication terminal
The information flow of scheduling carries out radio-resource-configuration, and user-radio-resource-configuration result is sent out by radio-resource-configuration signaling
The scheduler module at UAV Communication terminal is given, to inform scheduler module can transmit number on which carrier wave of which time
According to, and the Modulation and Coding Scheme used；
5) information flow HOL packet scheduling:
Scheduler module at UAV Communication terminal is according in user-radio-resource-configuration result, various information stream buffer queue
When HOL grouping, QCI multi-level weight and delay performance weight calculation difference information flow, user and radio resource configure
Dispatch weight function ψl,n,k(t) value is the right that the maximum HOL grouping of functional value assigns priority scheduling；
The dispatch weight function of the UAV Communication terminal is according to identified below:
By PF weight factorIntroduce dispatch weight function ψl,n,k(t) it in, enablesMeet (4) formula:
Wherein, Rn,kIf being (t) that n-th of UAV Communication end message stream of t moment by k-th of RB is forwarded to eNodeB
Message transmission rate expectation,It is last moment i.e. n-th of UAV Communication end message stream average data of t-1 moment
Transmission rate；Wherein,It is given by:
Wherein, RnIt (t) is momentary data transfer rates of n-th of UAV Communication terminal in t moment, α is for regulatory factor and under
Formula provides:
Wherein, TWFor the time window being had an impact to user fairness；
By CQI weight factor ωlIntroduce dispatch weight function ψl,n,k(t) in, ω is enabledl∈ (0,1] meet (7) formula:
Formula (7) guarantees that the scheduler module at UAV Communication terminal is always CQI priority is high in classification map module HOL points
Group distributes biggish CQI weight factor, and is that the low HOL grouping of CQI priority distributes lesser CQI weight factor, to assign
The right for possessing the HOL grouping acquisition priority scheduling of higher CQI weight factor is given, thus for different delay requirement and packet loss
The information flow that rate requires provides preliminary QoS transmission and guarantees；
For video traffic and audio service, by Delay Guarantee factor ωl,n(t) dispatch weight function ψ is introducedl,n,k(t) it in, enables
ωl,n(t) ∈ (0,1] meet (8) formula:
In formula (8), TlIt is grouped in UAV Communication terminal classification map module buffer queue for l grades of QCI information flows to be dispatched
Maximum wait delay requirement, τl,n(t)∈(0,Tl] it is l grades of QCI information flows of n-th of UAV Communication terminal of scheduling instance t
HOL to be dispatched is grouped in the waiting time in buffer queue, Δ Tl∈(0,Tl] it is the scheduled guard time interval of system, usually
It is set as frame length, i.e. interval between scheduling twice；If Δ Tl≤Tl-τl,n(t), i.e. τl,n(t)∈(0,Tl-ΔTl], then should
The waiting time of HOL grouping can satisfy delay requirement；If Δ Tl> Tl-τl,n(t), i.e. τl,n(t)∈(Tl-ΔTl,Tl], then
The waiting time of HOL grouping will exceed time delay restriction, dispatching priority highest, and scheduler module should assign it and obtain preferentially
The right of scheduling；
Dispatch weight function ψ suitable for UAV Communication terminall,n,k(t) ∈ (0,1] can be provided by formula (9):
Each scheduling instance, scheduler module is according to formula (9) in available UAV Communication terminal set, wireless resource block collection to be allocated
Matching primitives are carried out between conjunction and HOL grouping set to be dispatched, are searched out corresponding with maximum dispatch weight functional value wireless
Resource matched identifier, to transmit the specific information stream of relative users on corresponding wireless resource block；
6) information flow restores:
Various information flow point group to be scheduled is sequentially forwarded to the letter at eNodeB by the scheduler module at UAV Communication terminal
Breath stream recovery module, information flow recovery module is according to the flow identifier, user identifier and nothing bound in each grouping
The radio-resource-configuration result carried on line resource allocation signaling is packaged the grouping received, framing, it is final realize it is each
The transmission of category information stream.
2. the UAV Board Data link dispatching party according to claim 1 based on TD-LTE technology towards letter flow QoS guarantee
Method, which is characterized in that step 1) specifically:
Firstly, being assigned accordingly according to the QCI grade in LTE/SAE protocol frame for the grouping in every category information stream buffer queue
QCI multi-level weight；
Secondly, being grouped in the waiting time delay in buffer queue according to various information stream buffer queue squadron head, it is corresponding to assign it
Delay performance weight；
Finally, being grouped user bound identifier and flow identifier for each information flow.
3. the UAV Board Data link dispatching party according to claim 1 based on TD-LTE technology towards letter flow QoS guarantee
Method, which is characterized in that in step 2), the scheduler module at UAV Communication terminal needs in ascending wireless resource request process
The data volume and user identifier for telling the radio-resource-configuration module at eNodeB to be transmitted.
4. the UAV Board Data link dispatching party according to claim 1 based on TD-LTE technology towards letter flow QoS guarantee
Method, which is characterized in that in step 3), the channel status probe module at eNodeB will be to radio-resource-configuration module periodically
Updated up channel quality mark signaling is sent, so that available radio resource is wireless to overcome when the scheduling of notification stream
The time variation of channel.
5. the UAV Board Data link dispatching party according to claim 1 based on TD-LTE technology towards letter flow QoS guarantee
Method, which is characterized in that in step 5), scheduler module at UAV Communication terminal according to first in, first out the same letter of sequential scheduling
Grouping in breath stream buffer queue.
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| CN108040368B (en) * | 2017-12-22 | 2021-08-31 | 南京航空航天大学 | Unmanned aerial vehicle time-frequency resource allocation method based on block coordinate reduction |
| CN108199757B (en) * | 2018-01-15 | 2019-08-27 | 浙江大学 | A method of it is invaded using channel state information detection consumer level unmanned plane |
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