CN110417684A - A kind of downlink data bag dispatching method for phased array agile wave beam - Google Patents
A kind of downlink data bag dispatching method for phased array agile wave beam Download PDFInfo
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- CN110417684A CN110417684A CN201910705765.8A CN201910705765A CN110417684A CN 110417684 A CN110417684 A CN 110417684A CN 201910705765 A CN201910705765 A CN 201910705765A CN 110417684 A CN110417684 A CN 110417684A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/56—Queue scheduling implementing delay-aware scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/622—Queue service order
- H04L47/623—Weighted service order
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/625—Queue scheduling characterised by scheduling criteria for service slots or service orders
- H04L47/6275—Queue scheduling characterised by scheduling criteria for service slots or service orders based on priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/6295—Queue scheduling characterised by scheduling criteria using multiple queues, one for each individual QoS, connection, flow or priority
Abstract
The invention discloses a kind of downlink data bag dispatching methods for spaceborne phased array agile wave beam, which comprises ground control centre issues parameter；Judge whether present terminal meets normalization data packet number, the conditions such as maximum delay；Pass through three queues of Weight Round Robin present terminal；Due to using multiple Rule of judgment such as number-of-packet and time delay when whether dispatching active user, in the case where guaranteeing user terminal data packet delay requirement condition, transmission data packet as far as possible in each time slot at full capacity improves satellite downlink capacity.
Description
Technical field
The present invention relates to the data packet dispatching methods for satellite communication field, especially a kind of to be used for phased array agile wave
The downlink data bag dispatching method of beam.
Background technique
In the satellite communication system based on processing forward, data packet dispatching is one of key technology, and is used
There are particularity compared with the scheduling using fixed beam for phased array agile wave beam, especially in medium and low earth orbit satellites system, adopt
With high-gain agile wave beam, a wave beam needs for multiple subscriber terminal services, and each time slot is only capable of sending out to a user terminal
Send data packet, and the quantity of data packet that each time slot can accommodate is with the terminal capability of user terminal and the difference of link state
And it is different.(see document: WRR dispatching algorithm changes existing algorithm such as WRR algorithm for wireless resource scheduling in wireless network
Into: Yin Fengjie, Jin Xin etc.；Liaoning University's journal, Vol.40, No.2,2013,121-124), wireless fair queuing
(IWFQ is shown in document: Fair scheduling in wireless packet networks:Songwu Lu etc., IEEE/ACM
Transactions on networking, Vol.7, issue 4, Aug.1999,473-489) etc. all do not account in low rail
The physical layer attributes of telecommunication satellite can not be completely suitable in the satellite communication system based on phased array agile wave beam.
Multimedia satellite communication has wide coverage, by geographical conditions the advantages such as is not influenced, can and land mobile communication
It is formed and is had complementary advantages.Since usual satellite system is energy constraint system, for satellite downlink, in the certain feelings of total emission power
Under condition, beam angle is narrower, and satellite communication capabilities are stronger, and satellite capacity is bigger.However, wave beam is narrower to mean the effective of satellite
Area coverage is smaller, to be unable to give full play satellite communication advantage.With the maturation of phased-array technique, more and more by phase
Battle array technical application is controlled into satellite communication, by the agile ability using phased array beam, timesharing covers different regions, can be
In the case where not reducing satellite communication capabilities and message capacity, the equivalent area coverage of satellite is effectively improved.On the other hand, pass through
Using phased array agile wave beam, different zones are covered by wave beam timesharing on demand, satellite resource utilization rate can be effectively improved.
Summary of the invention
The technical problems to be solved by the present invention are: in view of the above problems, providing a kind of for phased array agile
The downlink data bag dispatching method of wave beam is full in each time slot as far as possible in the case where guaranteeing user terminal data packet delay requirement condition
The transmission data packet of load improves satellite downlink capacity.
The technical solution adopted by the invention is as follows:
A kind of downlink data bag dispatching method for phased array agile wave beam, comprising:
Step 1, system initialization: M user terminal of beams serves establishes three for the user terminal of wave beam current service
Queue: high-priority queue, middle priority query and Low Priority Queuing；Setting control centre issues following parameter: initially returning
One changes thresholding Thd=α；The data packet that each time slot of m-th of user terminal can be sent is Nm, wherein m=1,2 ... M；It is high preferential
The scheduling weight of grade queue, middle priority query and Low Priority Queuing is respectively w1,w2,w3, time delay weight is respectively v1,v2,
v3, time delay thresholding T；Current time slots are by user terminal the serial number indx, initial indx=1 of scheduling；Make a turn counter K, initial K=
0；Execute step 2；
Step 2, if judging, active user's terminal meets any one in condition one, condition two and condition three, executes
Step 3, no to then follow the steps 5；
Condition one: Sindx/Nindx>Thd；
Condition two:
Three: K > M of condition and Sindx>0；
Wherein, SindxIndicate the summation of remaining data packet number in three queues of i-th ndx user terminal；NindxIndicate the
The number-of-packet that one time slot of indx user terminal can be sent；Indicate i-th of queue of i-th ndx user terminal
Maximum delay, wherein i=1,2,3；
Step 3, to the high-priority queue of active user's terminal, middle priority query and Low Priority Queuing according to weighting
The mode of poll is scheduled: the w of first schedules high priority queue1A data packet, then in dispatching priority query w2A data
Packet, then the w of schedules low priority queue3A data packet, is recycled with this, until the total data packet number of scheduling is equal to NindxOr three
Queue is all empty；Execute step 4；
Step 4, make Thd=max (α, Sindx/Nindx), K=0,Execute step 6；
Step 5, make K=K+1, indx=indx+1, execute step 2；
Step 6, three queues to all user terminals for removing i-th ndx terminal, if i-th of m-th of user terminal
Queue length is not 0, thenWherein m=1,2 ..., M, and m ≠ indx；Then make indx=indx+1,
Execute step 2.
Preferably, the length of the time slot of each wave beam is isometric.
Preferably, the data packet is regular length.
Preferably, in step 3, priority is higher, and the packet number dispatched every time is more, i.e. w1>w2>w3。
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
The present invention dispatches its high, normal, basic three priority in the data packet of scheduling user terminal, using weighted polling mode
Queue, thus guarantee priority it is high have higher scheduled possibility, can guarantee service delay, while also can preferably mention
High resource utilization.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is flow chart of the invention.
Fig. 2 is system operation schematic diagram of the invention.
Fig. 3 is the dispatching effect display diagram of the embodiment of the present invention 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, claimed invention is not intended to limit to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The agile of phased array in downlink, can be using the fixation wave position divided by ground region come agile, can also be with
Using by the point-to-point agile of user terminal.The low rail telecommunication satellite in, due to the movement of satellite, simultaneously using fixed wave position agile
Without benefit, therefore the present invention uses and is directed toward beam center that is, according to the position of user terminal by the point-to-point agile of user terminal
The user terminal for needing to service, it is point-to-point to send data to the user terminal.
A kind of downlink data bag dispatching method for phased array agile wave beam provided by the invention, as shown in Figs. 1-2, if
The length of the time slot of fixed each wave beam is isometric, and data packet is also regular length, then executes following steps:
Step 1, system initialization: M user terminal of beams serves establishes three for the user terminal of wave beam current service
Queue: high-priority queue, middle priority query and Low Priority Queuing；Setting control centre issues following parameter: initially returning
One changes thresholding Thd=α；The data packet that each time slot of m-th of user terminal can be sent is Nm, wherein m=1,2 ... M；It is high preferential
The scheduling weight of grade queue, middle priority query and Low Priority Queuing is respectively w1,w2,w3, time delay weight is respectively v1,v2,
v3, time delay thresholding T；Current time slots are by user terminal the serial number indx, initial indx=1 of scheduling；Make a turn counter K, initial K=
0；Execute step 2；
Step 2, if judging, active user's terminal meets any one in condition one, condition two and condition three, executes
Step 3, no to then follow the steps 5；
Condition one: Sindx/Nindx>Thd；Condition one is that total said conditions, i.e. the user terminal indx of current scheduling are wrapped in normalization
Three queues remaining data packet number summation SindxThe number-of-packet N that can be sent with one time slotindxThe ratio between be greater than normalizing
Change thresholding Thd；Due to the ability (antenna aperture) and link difference of each user terminal, modulation coding scheme even bandwidth is
Difference, so that the data packet number that can be transmitted under the time slot of identical length is different, therefore using here is normalization thresholding；
Since phased array agile wave beam is directional aerial, single time slot can only service a user terminal, and slot length is fixed, therefore
In order to make full use of the resource of satellite preciousness, it is desirable to each time slot can at full capacity to user terminal send data, therefore
In scheduling, it is desirable in the time slot for being sent to i-th ndx user terminal, the number-of-packet of transmission institute's energy under single time slot for it
The maximum quantity N of the data packet of transmissionindx, to improve power system capacity.
Condition two:Condition two is time delay condition, i.e.,
When the weighting time delay of any one queue is greater than the thresholding of setting in three queues of active user's terminal, then user end is dispatched
End；Indicate the maximum delay of i-th of queue of i-th ndx user terminal, wherein i=1,2,3；
Three: K > M of condition and Sindx>0；Condition three is indicated when all users are unable to satisfy two above condition, then is adjusted
Spend next non-empty user terminal.
Step 3, to the high-priority queue of active user's terminal, middle priority query and Low Priority Queuing according to weighting
The mode of poll is scheduled: the w of first schedules high priority queue1A data packet, then in dispatching priority query w2A data
Packet, then the w of schedules low priority queue3A data packet, is recycled with this, until the total data packet number of scheduling is equal to NindxOr three
Queue is all empty；Execute step 4；
In step 3, priority is higher, and the packet number dispatched every time is more, i.e. w1>w2>w3, guarantee the elder generation of high priority with this
It is scheduled.In order to reduce computation complexity on star, the weight w1,w2,w3By being infused in control centre, can dynamically change.
Step 4, threshold parameter Thd is updated, Thd=max (α, S are madeindx/Nindx), K=0, Execute step
6；
Step 5, make K=K+1, indx=indx+1, execute step 2；
Step 6, to three queues of all terminals except i-th ndx terminal, if i-th of queue length of m-th of terminal
It is not 0, thenWherein m=1,2 ..., M, and m ≠ indx；Then make indx=indx+1, and execute step
2。
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
To a medium and low earth orbit satellites, it is assumed that 20 user terminals of certain agile beams serves, the ability of all user terminals and
Link state is identical, and each time slot can send 30 data packets, and every frame has 40 time slots.The parameter difference infused in control centre
For [w1,w2,w3]=[6,3,1], [v1,v2,v3]=[1,0.6,0.3], time delay thresholding T=30 is initial to normalize thresholding Thd=
α=1.
The business of high-priority queue is that low time delay shakes constant rate of speed business, and user terminal 1 to 10 has the type business；
The business of middle priority query is the constant rate of speed business with burst；The business of Low Priority Queuing is burst inferior grade business,
Satellite provides the service of doing one's best.
It is the average data packet input quantity of the business of each user terminal different priorities as shown in the upper part of Fig. 3, it is each to use
Every frame input packet number of the high-priority queue of family terminal is randomly generated, and the same every frame packet number of user terminal is identical, middle priority
Queue includes constant rate of speed part and burst part, and every frame of each user of Low Priority Queuing, which is randomly generated, reaches packet number.
After 1000 frames, the average delay of each user terminal different priorities queue is as shown in part under Fig. 3, it can be seen that
To all user terminals, the average delay of high-priority queue is lower than middle priority query, and the higher time delay of priority is smaller.By
The average transmission packet number for counting each time slot is 28.9, is nearly at and sends at full capacity.High-priority queue is defeated from data packet
Entering the maximum delay exported to scheduling is 0.5 frame length, and the maximum delay of middle priority query is 1 frame length, low priority team
The maximum delay of column is 2.5 frame lengths.It can be seen that the present invention can guarantee service delay by the embodiment, while also can be preferable
Raising resource utilization.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. a kind of downlink data bag dispatching method for phased array agile wave beam characterized by comprising
Step 1, system initialization: M user terminal of beams serves establishes three teams for the user terminal of wave beam current service
Column: high-priority queue, middle priority query and Low Priority Queuing；Setting control centre issues following parameter: initial normalizing
Change thresholding Thd=α；The data packet that each time slot of m-th of user terminal can be sent is Nm, wherein m=1,2 ... M；High priority
The scheduling weight of queue, middle priority query and Low Priority Queuing is respectively w1,w2,w3, time delay weight is respectively v1,v2,v3,
Time delay thresholding T；Current time slots are by user terminal the serial number indx, initial indx=1 of scheduling；Make a turn counter K, initial K=0；
Execute step 2；
Step 2, if judging, active user's terminal meets any one in condition one, condition two and condition three, thens follow the steps
3, it is no to then follow the steps 5；
Condition one: Sindx/Nindx>Thd；
Condition two:
Three: K > M of condition and Sindx>0；
Wherein, SindxIndicate the summation of remaining data packet number in three queues of i-th ndx user terminal；NindxIndicate the i-th ndx
The number-of-packet that one time slot of a user terminal can be sent；Indicate i-th, i=1,2,3 of i-th ndx user terminal
The maximum delay of queue；
Step 3, to the high-priority queue of active user's terminal, middle priority query and Low Priority Queuing according to weighted polling
Mode be scheduled: the w of first schedules high priority queue1A data packet, then in dispatching priority query w2A data packet,
The w of schedules low priority queue again3A data packet, is recycled with this, until the total data packet number of scheduling is equal to NindxOr three queues
It is all sky；Execute step 4；
Step 4, make Thd=max (α, Sindx/Nindx), K=0,Execute step 6；
Step 5, make K=K+1, indx=indx+1, execute step 2；
Step 6, to three queues of all user terminals except i-th ndx terminal, if i-th of queue of m-th of user terminal
Length is not 0, thenWherein m=1,2 ..., M, and m ≠ indx；Then make indx=indx+1, execute
Step 2.
2. being used for the downlink data bag dispatching method of phased array agile wave beam as described in claim 1, which is characterized in that each
The length of the time slot of the wave beam is isometric.
3. being used for the downlink data bag dispatching method of phased array agile wave beam as described in claim 1, which is characterized in that described
Data packet is regular length.
4. being used for the downlink data bag dispatching method of phased array agile wave beam as described in claim 1, which is characterized in that step
In 3, priority is higher, and the packet number dispatched every time is more, i.e. w1>w2>w3。
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| CN113726407A (en) * | 2021-08-25 | 2021-11-30 | 中国电子科技集团公司第五十四研究所 | Control method and device based on satellite autonomous control beam burst-by-burst agility |
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