CN116760457B - Resource allocation method based on satellite battery life - Google Patents
Resource allocation method based on satellite battery life Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
- H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control
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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
- H04L47/10—Flow control; Congestion control
- H04L47/22—Traffic shaping
- H04L47/225—Determination of shaping rate, e.g. using a moving window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0457—Variable allocation of band or rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
- H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the field of wireless communication networks, and particularly relates to a resource allocation method based on satellite battery life; acquiring state information of a low-orbit satellite, and calculating the current battery life of the low-orbit satellite according to the state information; setting a service life threshold, starting an adjustment mechanism to update the transmitting power of the low-orbit satellite when the service life of the battery of the low-orbit satellite is smaller than the service life threshold, calculating the processing traffic of the low-orbit satellite according to the updated transmitting power, constructing a satellite-ground flow control frame carrying the processing traffic information, and feeding back to ground equipment; the ground equipment adjusts a queue scheduling strategy according to the processing traffic information carried by the star-to-ground flow control frame, and allocates bandwidth resources for different types of data again; the invention evaluates the residual service life of the satellite, adjusts the transmitting power, calculates the service volume which can be processed by the satellite after adjustment, feeds back the service volume to the ground equipment by constructing the flow control frame, and finally the ground equipment analyzes the information to adjust the bandwidth resource allocation, thereby adapting to the service volume of satellite processing and effectively prolonging the service life of the satellite.
Description
Technical Field
The invention belongs to the field of wireless communication networks, relates to a low-orbit satellite and terminal communication technology, and particularly relates to a resource allocation method based on the service life of a satellite battery.
Background
Satellite communication is a communication system in which a satellite is used as a "base station" to relay a retransmission signal. The low-orbit satellite communication is an important component of satellite communication, and the low-orbit satellite system can be connected with a high-orbit communication network and a ground core network to realize interconnection of a ground network and the like, so that an air-sky integrated information transmission processing system is formed. Low orbit satellite communication networks are currently increasing their capacity, reducing delays and lowering costs to ensure large scale market expansion. In order to reduce the production costs, it is important to consider extending the life of batteries mounted on these satellites. Low earth orbit satellites transmit communications to the ground requiring power to process traffic by consuming power from batteries in shade. The life of a battery can be expressed in terms of the number of charge and discharge cycles of the battery, and the battery life can be affected by factors such as battery capacity, temperature, and depth of discharge. The satellite battery life is also related to the energy consumed by the satellite, where the energy consumed by the power consuming power amplifier accounts for a substantial portion of the overall device, so the ability to optimize the consumption of the satellite power amplifier and reduce the traffic handled by the satellite can be considered, reducing the overall consumption of the satellite.
Many studies on low-orbit satellite constellation costs take into account geographic location and time-dependent traffic and propagation path conditions; there are also studies to extend battery life by controlling transmission power for service processing to reduce power consumption and offloading the mission of a disadvantaged battery satellite to other satellites, which however reduces the service life of other satellites and has high computational complexity. Although many studies are currently being conducted to reduce the cost of satellite communication systems, there is no combination of adjusting the communication between the ground equipment and the satellite, which may result in the traffic of the satellite process after power adjustment not meeting the requirements of the satellite process, resulting in data loss. Therefore, the influence of a ground scheduling mechanism on the satellite processing traffic can be considered, and the service life of the satellite can be effectively prolonged.
Disclosure of Invention
In order to solve the above problems, the present invention provides a resource allocation method based on satellite battery life, comprising the following steps:
s1, acquiring state information of a low-orbit satellite, and calculating the current battery life of the low-orbit satellite according to the state information;
s2, setting a service life threshold, if the current battery service life of the low-orbit satellite is smaller than the service life threshold, starting an adjustment mechanism to update the transmitting power of the low-orbit satellite, and triggering a feedback mechanism to execute a step S3;
s3, calculating the processing traffic of the low-orbit satellite according to the updated transmitting power, constructing a satellite-ground flow control frame carrying the processing traffic and feeding back the frame to ground equipment;
s4, the ground equipment adjusts a queue scheduling strategy according to the processing traffic carried by the star-to-ground flow control frame, and bandwidth resources are allocated for different types of data again.
Further, the state information includes the current battery charge and discharge cycle times of the low-orbit satellite, the battery capacity used for each discharge, the voltage and the transmitting power of each discharge.
Further, the current battery life of the low orbit satellite is calculated according to the state information, and the calculation formula is as follows:
wherein T is w Indicating the current battery life of the low-orbit satellite, N indicating the current battery charge-discharge cycle times of the low-orbit satellite, C i Indicating battery capacity for ith discharge of battery of low-orbit satellite, U i Voltage representing ith discharge of battery of low-orbit satellite, P s Representing the transmitted power of a low-orbit satellite, U s Indicating that the transmitting power of the low orbit satellite is P s Voltage consumed by time, U w Representing the voltage provided by the battery of the low-orbit satellite to the transmitter, α represents the proportion of the transmitter power amplifier to the satellite device power consumption.
Further, the expression of the adjustment mechanism in step S2 is:
wherein beta represents a power control factor, T w Indicating the current battery life, T, of the low-orbit satellite t Represents the lifetime threshold, P before Representing the transmit power of unadjusted low earth orbit satellites, P after Representing the adjusted transmit power of the low-orbit satellite.
Further, the adjustment mechanism further includes constraint C 0 And C 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein constraint C 0 Is a constraint on transmit power and transmission distance, expressed as:
C 0 ：
Pt(dBm)≤20lgd min (km)+Ct(dB)-Gt(dB)+32.44+20lgf(MHz)
+Cr(dB)+Pr(dBm)+Gr(dB)
constraint C 1 Is a constraint on the power regulatory factor β, expressed as:
C 1 ：
L′＝20lgd min (km)+Ct(dB)-Gt(dB)+32.44+20lgf(MHz)+Cr(dB)
+Pr(dBm)+Gr(dB)
wherein d min The minimum transmission distance between the star and the earth is represented by Ct, gt, the antenna gain of the transmitting end, f, the working frequency, cr, the receiving end joint and the cable loss, pr, the receiving end sensitivity and Pt, and the transmitting end power.
Further, the satellite-to-ground flow control frame carrying the processing traffic constructed in step S3 includes a 12-byte carry tag field for storing the processing traffic and channel capacity of the low-orbit satellite.
Further, step S4, the ground device adjusts a queue scheduling policy according to the processing traffic carried by the star-to-ground flow control frame, which includes the following steps:
s41, defining 4 types of non-time-sensitive data and 4 types of time-sensitive data, setting a queue for each type of data, wherein each queue corresponds to one gate;
s42, calculating the request rate of each type of non-time-sensitive data queue according to the size of the data packet currently stored in the queue;
s43, acquiring total bandwidth resources allocated to the 4 types of non-time-sensitive data queues through processing traffic carried by the star-to-ground flow control frame, and calculating the transmission rate of each type of non-time-sensitive data queues according to the request rate.
Further, after the ground device adjusts the queue scheduling policy according to the processing traffic carried by the star-to-ground flow control frame, the data transmission process includes:
s431, receiving data and classifying the data to be put into corresponding queues;
s432, judging whether a gate is opened, if so, entering a step S433, and if not, returning to the step S431;
s433, judging whether a queue corresponding to the opened gate control belongs to non-time sensitive data, if so, controlling the data of the queue according to an adjusted queue scheduling strategy, transmitting the data to a priority scheduling module, and if not, directly transmitting the data of the queue to the priority scheduling module;
s434, the priority scheduling module outputs data according to the order of priority from high to low.
Further, in step S4, the ground device adjusts the queue scheduling policy according to the processing traffic carried by the star-to-ground flow control frame, where the adjusted queue scheduling policy and the battery life satisfy the following relationships:
wherein beta represents a power control factor, B ts Represents Shi Min queue traffic, SR after adjustment by a ground equipment scheduling mechanism bts Indicating the transmission rate of a non-time-sensitive queue adjusted by a ground equipment scheduling mechanism, wherein N indicates the current battery charge and discharge cycle times of a low-orbit satellite, and C i Representing battery capacity for ith discharge use of low-orbit satellite battery，U i Voltage representing the ith discharge of the battery of the low-orbit satellite, U s Indicating that the transmitting power of the low orbit satellite is P s Voltage consumed by time, T t Representing the lifetime threshold, α represents the proportion of the transmitter power amplifier to the satellite device power consumption, T w Indicating the current battery life of the low-orbit satellite, U w Representing the voltage provided by the battery of the low-orbit satellite to the transmitter.
The invention has the beneficial effects that:
in order to reduce the cost of a low-orbit satellite in a low-orbit satellite and ground communication system, the invention designs a solution for effectively prolonging the service life of a battery by combining a ground equipment scheduling mechanism, firstly, the service life of the satellite is estimated according to the charge and discharge cycle times of the battery, the transmitting power of the satellite is adjusted according to a set threshold value, a satellite-ground feedback flow control frame is designed, information is sent to ground equipment, the ground equipment uses a credit value scheduling mechanism CBS as an idea, and the data queue rate is adjusted to realize the redistribution of bandwidth resources so as to avoid the data loss caused by the fact that the ground equipment scheduling mechanism is not adjusted after the satellite is adjusted; the method provided by the invention can be combined with a ground scheduling mechanism to effectively prolong the service life of the satellite battery.
Drawings
FIG. 1 is a model of a low-orbit satellite and terrestrial communication network used in an embodiment of the invention;
FIG. 2 is a flow chart of an implementation of a satellite life optimization method based on a ground device scheduling mechanism in an embodiment of the present invention;
fig. 3 is a feedback flow control frame structure employed in the present invention;
FIG. 4 is a schematic diagram of an adjusted data queue scheduling of a ground device according to an embodiment of the present invention;
FIG. 5 is a flow chart of data queue scheduling in an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In one embodiment, the present invention provides a satellite-to-ground communication network model as shown in fig. 1, where the satellite-to-ground communication network model includes a low-orbit satellite, a ground terminal device, and a ground gateway device, where the low-orbit satellite and the ground terminal device transmit data through the ground gateway device; particularly, in order to reduce the production cost of the low-orbit satellite communication network, the satellite-ground communication network model provided by the invention particularly marks the condition of a satellite battery, namely, the satellite battery is started from the direction of the battery installed on the low-orbit satellite, and the battery replacement frequency is reduced by prolonging the service life of the satellite battery, so that the satellite production cost is reduced; meanwhile, in order to ensure effective transmission of data, the communication condition between the satellite and the ground equipment is also required to be considered, so that the invention provides a resource allocation method based on the service life of the satellite battery based on research and analysis of the service life of the satellite and the adjustment mechanism of the ground equipment.
The invention provides a resource allocation method based on satellite battery life, as shown in fig. 2, comprising the following steps:
s1, acquiring state information of a low-orbit satellite, and calculating the current battery life of the low-orbit satellite according to the state information.
Specifically, the low-orbit satellite transmits power required for communication to the ground, and in the daytime, the low-orbit satellite can utilize solar energy to replace electric energy for communication transmission to the ground and can also charge a battery with redundant energy; in a shade place, the low orbit satellite cannot utilize solar energy and can only communicate and transmit by consuming the electric energy of the battery; therefore, the battery is important for the communication between the satellite and the ground equipment, and the service life of the battery can influence the service life of the satellite, so that the research on the service life of the satellite battery cannot be ignored by considering the satellite communication.
The life of the battery is generally affected by various factors such as battery depth (Depth of discharge, DOD), discharge rate, battery capacity and temperature, and in order to accurately evaluate the battery life and reduce the calculation cost, the invention mainly evaluates the satellite life by the battery capacity and the number of charge-discharge cycles. Wherein the battery capacity is defined as follows:
where C represents battery capacity, T represents battery usage time, P represents device power consumption, and U represents battery voltage.
Specifically, the battery life of the satellite has a relationship with the energy consumed by the satellite, and the more energy the satellite consumes, the more electrical energy the battery uses, and the shorter the life may be affected. In the energy consumed by the satellite, the power consumed by the satellite transmitter power amplifier is about 60% -90% of the total satellite equipment, that is, the transmission power and the consumed power of the battery have close correlation, and the larger the transmission power is, the larger the consumed battery power is. Based on this, the present invention defines the battery life as follows:
wherein T is w Indicating the current battery life of the low-orbit satellite, N indicating the current battery charge-discharge cycle times of the low-orbit satellite, C i Indicating battery capacity for ith discharge of battery of low-orbit satellite, U i Voltage representing ith discharge of battery of low-orbit satellite, P s Representing the transmitted power of a low-orbit satellite, U s Indicating that the transmitting power of the low orbit satellite is P s Voltage consumed by time, U w Representing the voltage provided by the battery of the low-orbit satellite to the transmitter, α represents the proportion of the transmitter power amplifier to the satellite device power consumption.
S2, setting a service life threshold, if the current battery service life of the low-orbit satellite is smaller than the service life threshold, starting an adjustment mechanism to update the transmitting power of the low-orbit satellite, and triggering a feedback mechanism to execute a step S3; if the battery life of the low-orbit satellite is not less than the life threshold, returning to the step S1.
Specifically, as can be seen from the formula (2), the battery life of the satellite is related to the transmitting power, so that the invention sets the life threshold to adjust the transmitting power, thereby reducing the energy consumption and prolonging the service life, and the specific adjustment mechanism is expressed as:
wherein beta represents a power control factor, T w Indicating the current battery life, T, of the low-orbit satellite t Represents the lifetime threshold, P before Representing the transmit power of an unadjusted low orbit satellite, P in equation (3) before Refers to the transmission power P of the low-orbit satellite obtained in the step S1 s ；P after Representing the adjusted transmit power of the low-orbit satellite.
Specifically, at a fixed operating frequency, the communication distance is affected by factors such as transmit power, receive sensitivity, transmission loss, antenna gain, and the like; the constraints between the transmit power and the communication distance need to be taken into account when performing the adjustment mechanism to adjust the transmit power.
Among the factors affecting the communication distance, the influence of the geographical environment, electromagnetic environment and climate conditions on the wireless communication distance is determined by the use condition of the user, is difficult to change, is also difficult to describe by a mathematical expression, and only the energy factors can be described by the mathematical expression. Generally, the relation expression of the transmission loss, the communication distance and the working frequency is as follows:
L fs (dB)＝32.44+20lgd(km)+20lgf(MHz)(4)
wherein L is fs The transmission loss is represented, d the communication distance, and f the operating frequency.
The relation expression of the transmission loss, the transmitting power, the antenna gain and the receiving sensitivity is as follows:
Pr(dBm)＝Pt(dBm)-Ct(dB)+Gt(dB)-L fs (dB)-Cr(dB)-Gr(dB)(5)
wherein Ct represents the transmitting terminal joint and cable loss, gt represents the transmitting terminal antenna gain, cr represents the receiving terminal joint and cable loss, pr represents the receiving terminal sensitivity, gr represents the receiving terminal antenna gain, and Pt represents the transmitting terminal power, i.e., the transmitting power.
The relation expression of the transmission power and the communication distance can be obtained according to the expression (4) and the expression (5): 20lgd (km) =pt (dBm) -Ct (dB) +gt (dB) -32.44-20lgf (MHz) -Pr (dBm)
-Cr(dB)-Gr(dB)(6)
The communication distance needs to satisfy the following conditions:
d≤d min
wherein d min Representing the minimum transmission distance between the stars and the ground, the adjustment of the transmission power is required to satisfy the following constraint condition C 0 ：
C 0 ：
Pt(dBm)≤20lgd min (km)+Ct(dB)-Gt(dB)+32.44+20lgf(MHz)
+Cr(dB)+Pr(dBm)+Gr(dB)
In addition, in order to ensure that the remaining life of the battery after the power is updated by the adjustment mechanism can satisfy the set life threshold, the power regulation factor β is made to satisfy the constraint condition C based on the formulas (2), (3) and (5) 1 ：
C 1 ：
L′＝20lgd min (km)+Ct(dB)-Gt(dB)+32.44+20lgf(MHz)+Cr(dB)
+Pr(dBm)+Gr(dB)
S3, calculating the processing traffic of the low-orbit satellite according to the updated transmitting power, constructing a satellite-ground flow control frame carrying the processing traffic, and feeding back the satellite-ground flow control frame to ground equipment.
If the satellite transmitting power is independently regulated to prolong the service life, the transmission quality cannot be completely ensured without considering the influence of a scheduling mechanism of the ground equipment, and the ground equipment is easy to cause data loss if the transmission behavior is not controlled.
In order to solve the packet loss problem, the invention provides a flow feedback control mechanism. Firstly, calculating channel capacity according to the adjusted transmitting power by shannon theorem, wherein the channel capacity is equivalent to the total bandwidth of a channel, and the channel capacity is used as the size of the traffic which can be processed by a satellite; and then feeding back the result to the ground equipment, and integrating the ground equipment with the on-board switching equipment by means of behavior control of the ground equipment to form a network transmission architecture integrating satellite and ground and a network terminal, thereby solving the problem of packet loss.
Specifically, by constructing a satellite-to-ground flow control frame carrying processing traffic, the processing traffic of a satellite is fed back to ground equipment, and the structure of the satellite-to-ground flow control frame provided by the invention is shown in fig. 3, and comprises the following fields:
frame header: the frame start mark is used for the exchanger to identify the star-to-ground flow control frame start position;
length: the total length of the star-to-ground flow control frame is in bytes;
type (2): the type of the star-to-ground flow control frame is used for forwarding processing on the star and the ground;
priority level: the scheduling priority of the star-to-ground flow control frames, the star-to-ground flow control frames with high priority can be distributed to more storage resources and scheduling weights;
carrying a label: the method mainly comprises the processing traffic of the satellite, namely the size of the traffic which can be processed by the satellite;
and (3) checking: and the check field of the star-to-ground flow control frame is used for ensuring the transmission correctness of the star-to-ground flow control frame.
S4, the ground equipment adjusts a queue scheduling strategy according to the processing traffic carried by the star-to-ground flow control frame, and bandwidth resources are allocated for different types of data again.
Specifically, after receiving the satellite-to-ground flow control frame, the ground equipment analyzes the received satellite-to-ground flow control frame to obtain the service volume which can be processed by the satellite, and adjusts a queue output rate scheduling mechanism by taking a credit shaping (CBS) mechanism in a Time sensitive network (Time-Sensitive Networking, TSN) as an idea to reallocate bandwidth resources of different services.
Specifically, the TSN protocol is a VLAN conforming to the ieee802.1q standard, and a total of 8 priorities of 0 to 7 are defined by inserting PCP (Priority Code Point) of 3 bits into an ethernet frame of the standard, and the transmission types corresponding to the 8 priorities are respectively based on, best effort, excellent effort, strict jitter, video with a delay jitter of less than 100ms, audio with a delay jitter of less than 100ms, internal network control, and network control, wherein data belonging to the priorities of 0 to 3 are defined as non-time-sensitive data, and data belonging to the priorities of 4 to 7 are defined as time-sensitive data. The invention adopts a mode of distributing credit values to different types of data to adjust the transmission rate, in order to minimize the influence on the time delay of time-sensitive data, the credit values are not set for the time-sensitive data queues, the transmission rate is not limited, and once the service accumulation or arrival exists in the current queue transmission queue, the transmission is directly carried out. Therefore, the invention only needs to adjust the transmission rate of the queue with the priority of 0 to 3. As shown in fig. 4, in order to ensure the real-time performance of the time-sensitive service, the dequeue rate of the time-sensitive service may not need to be changed, but only the dequeue rate of the non-time-sensitive service needs to be changed.
Specifically, the ground device adjusts a queue scheduling strategy according to the processing traffic carried by the star-to-ground flow control frame, and reallocates bandwidth resources for different types of data, comprising the following steps:
s41, defining a non-time sensitive data queue P j The Credit value of j=0, 1,2,3 is Credit j The Sendslope is S j Idleslope is I j Wherein:
S j <0，I j >0，S j ＝I j -C nts
in the invention, set S j =0, then there is:
I j ＝C nts
wherein C is sum Representing the total bandwidth of the whole communication link, namely the processing traffic carried by the star-to-ground flow control frame; c (C) nts Representing the total bandwidth occupied by all non-time sensitive data. In particular, idleslope is the bandwidth actually reserved for the queue, and Sendslope is the port transfer rate supported by the underlying MAC service.
S42, the transmission resources required by the four types of non-time-sensitive data are different when the data are forwarded, the transmission resources are related to the total size of the data to be transmitted, the request rate is used for representing the bandwidth resources required by the data to be forwarded in the current time slot, and P is defined respectively 0 ，P 1 ，P 2 And P 3 Number of (2)The total size of the data packets is B respectively 0 ，B 1 ，B 2 And B 3 Define their request rate as R 0 ，R 1 ，R 2 And R is 3 The method comprises the following steps:
the four types of non-time sensitive data all complete the transmission of the required total bandwidth C nts The method comprises the following steps:
C nts ＝R 0 +R 1 +R 2 +R 3
s43, when the total bandwidth resource is reduced, a certain output rate is required to be configured for a queue of the non-time-sensitive data when the non-time-sensitive data is transmitted, and the size of the distributed output rate determines how much data volume of the non-time-sensitive data can be transmitted, namely, the occupied transmission resource can be analyzed. For P 0 ，P 1 ，P 2 And P 3 Data queues allocate different output rates SR 0 ，SR 1 ，SR 2 And SR (Surfural) 3 They should allocate bandwidth resources equal to or less than the remaining bandwidth after Shi Min data removal. The transmission rates of the four types of non-time-sensitive data queues are distributed proportionally according to the request rates of the four types of non-time-sensitive data:
C sum ＝C ts +C nts
wherein SR is as follows z Representing the transmission rate of a non-time sensitive data queue of type z=0, 1,2,3, R z Representing the request rate of z-type time-insensitive data, R j Representing the request rate of j-class non-time sensitive data, C nts Representing the total bandwidth occupied by all non-time sensitive data, B z Representing the traffic of z-type time-insensitive data, T z Representing the occupied time slot of z-type non-time sensitive data, C ts Representing the total bandwidth occupied by all time-sensitive data, C sum Representing the total bandwidth of the entire communication link.
After the ground equipment adjusts the queue scheduling strategy according to the processing traffic carried by the star-to-ground flow control frame, the data transmission is performed by adopting a flow shown in fig. 5, which comprises the following steps: firstly, carrying out corresponding classification on received data according to 8 priorities, and then putting the data into corresponding queues; if the gating of the queue is opened, judging whether the queue belongs to a queue of non-time-sensitive data, if so, controlling according to the rate limit in the adjusted queue scheduling strategy, and if not, directly outputting; all the data output by the queues need to pass through the priority scheduling module, and when a plurality of queue data are output at the same time, the data are output in the order from high priority to low priority.
Specifically, after the queue scheduling mechanism is adjusted, the total traffic of the 4-class time-sensitive data queue is B ts The total transmission rate of the class 4 time-insensitive data queue is SR nts Traffic B received by satellites per unit time m ＝B ts +SR nts The power consumption of the power amplifier that is consumed to handle these traffic is defined as P m (P m ＝B m ) Relation between power consumed by power amplifier and transmitting powerSatellite battery life T w The queue transmission rate relationship with the scheduling mechanism is expressed as:
and the ground equipment adjusts the queue scheduling strategy according to the processing traffic carried by the star-to-ground flow control frame, and then judges whether the equation is satisfied at the moment, if so, bandwidth resources are allocated to different types of data again according to the queue scheduling strategy at the moment, and if not, the queue scheduling strategy is continuously adjusted until the equation is satisfied.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "rotated," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The resource allocation method based on the service life of the satellite battery is characterized by comprising the following steps of:
s1, acquiring state information of a low-orbit satellite, and calculating the current battery life of the low-orbit satellite according to the state information;
s2, setting a service life threshold, if the current battery service life of the low-orbit satellite is smaller than the service life threshold, starting an adjustment mechanism to update the transmitting power of the low-orbit satellite, and triggering a feedback mechanism to execute a step S3;
the expression of the adjustment mechanism in step S2 is:
wherein beta represents a power control factor, T w Indicating the current battery life, T, of the low-orbit satellite t Represents the lifetime threshold, P before Representing the transmit power of unadjusted low earth orbit satellites, P after Representing the adjusted transmit power of the low-orbit satellite;
s3, calculating the processing traffic of the low-orbit satellite according to the updated transmitting power, constructing a satellite-ground flow control frame carrying the processing traffic and feeding back the frame to ground equipment;
s4, the ground equipment adjusts a queue scheduling strategy according to the processing traffic carried by the star-to-ground flow control frame, and allocates bandwidth resources for different types of data again, and the method comprises the following steps:
s41, defining 4 types of non-time-sensitive data and 4 types of time-sensitive data, setting a queue for each type of data, wherein each queue corresponds to one gate;
s42, calculating the request rate of each type of non-time-sensitive data queue according to the size of the data packet currently stored in the queue;
s43, acquiring total bandwidth resources allocated to the 4 types of non-time-sensitive data queues through processing traffic carried by the star-to-ground flow control frame, and calculating the transmission rate of each type of non-time-sensitive data queues according to the request rate.
2. The method of claim 1, wherein the status information includes a current number of battery charge and discharge cycles, a battery capacity used per discharge, a voltage per discharge, and a transmit power of the low-orbit satellite.
3. The method for allocating resources based on battery life of satellites according to claim 2, wherein the current battery life of the low-orbit satellite is calculated according to the state information, and the calculation formula is:
wherein T is w Indicating the current battery life of the low-orbit satellite, N indicating the current battery charge-discharge cycle times of the low-orbit satellite, C i Indicating battery capacity for ith discharge of battery of low-orbit satellite, U i Voltage representing ith discharge of battery of low-orbit satellite, P s Representing the transmitted power of a low-orbit satellite, U s Indicating that the transmitting power of the low orbit satellite is P s Voltage consumed by time, U w Representing the voltage provided by the battery of the low-orbit satellite to the transmitter, α represents the proportion of the transmitter power amplifier to the satellite device power consumption.
4. The method for satellite battery life-based resource allocation according to claim 1, wherein the adjustment mechanism further comprises a constraint C 0 And C 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein constraint C 0 Is a constraint on transmit power and transmission distance, expressed as:
C 0 ：
Pt(dBm)≤20lgd min (km)+Ct(dB)-Gt(dB)+32.44+20lgf(MHz)
+Cr(dB)+Pr(dBm)+Gr(dB)
constraint C 1 Is a constraint on the power regulatory factor β, expressed as:
C 1 ：
L′＝20lgd min (km)+Ct(dB)-Gt(dB)+32.44+20lgf(MHz)+Cr(dB)
+Pr(dBm)+Gr(dB)
wherein d min The minimum transmission distance between the star and the earth is represented by Ct, gt, the antenna gain of the transmitting end, f, the working frequency, cr, the receiving end joint and the cable loss, pr, the receiving end sensitivity and Pt, and the transmitting end power.
5. The method according to claim 1, wherein the satellite-to-ground flow control frame carrying the processing traffic constructed in step S3 includes a 12-byte carry tag field for storing the processing traffic and channel capacity of the low-orbit satellite.
6. The method for allocating resources based on satellite battery life according to claim 1, wherein after the ground device adjusts the queue scheduling policy according to the processing traffic carried by the satellite-to-ground flow control frame, the data transmission process includes:
s431, receiving data and classifying the data to be put into corresponding queues;
s432, judging whether a gate is opened, if so, entering a step S433, and if not, returning to the step S431;
s433, judging whether a queue corresponding to the opened gate control belongs to non-time sensitive data, if so, controlling the data of the queue according to an adjusted queue scheduling strategy, transmitting the data to a priority scheduling module, and if not, directly transmitting the data of the queue to the priority scheduling module;
s434, the priority scheduling module outputs data according to the order of priority from high to low.
7. The resource allocation method based on satellite battery life as claimed in claim 1, wherein in step S4, the ground device adjusts a queue scheduling policy according to the processing traffic carried by the satellite-to-ground flow control frame, and the adjusted queue scheduling policy and battery life satisfy the following relationship:
wherein beta represents a power control factor, B ts Represents Shi Min queue traffic, SR after adjustment by a ground equipment scheduling mechanism nts Indicating the transmission rate of a non-time-sensitive queue adjusted by a ground equipment scheduling mechanism, wherein N indicates the current battery charge and discharge cycle times of a low-orbit satellite, and C i Indicating battery capacity for ith discharge of battery of low-orbit satellite, U i Voltage representing the ith discharge of the battery of the low-orbit satellite, U s Indicating that the transmitting power of the low orbit satellite is P s Voltage consumed by time, T t Representing the lifetime threshold, α represents the proportion of the transmitter power amplifier to the satellite device power consumption, T w Indicating the current battery life of the low-orbit satellite, U w Representing the voltage provided by the battery of the low-orbit satellite to the transmitter.
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