CN111148253A - Satellite communication downlink SC-OFDMA frequency allocation method for accessing multiple terminals - Google Patents
Satellite communication downlink SC-OFDMA frequency allocation method for accessing multiple terminals Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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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]
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- 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
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- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention provides a satellite communication downlink SC-OFDMA frequency allocation method for accessing various terminals, which adopts different resource planning and scheduling methods according to the terminal condition in the overall planning of satellite communication application. The first application scenario is that the terminal antenna has a uniform equivalent aperture, the user downlink adopts an SC-OFDMA system and a full-band IFDMA mode, the power amplifier of the user downlink works at a 1dB compression point, and the system power efficiency is highest; the second application scenario is that the terminal antenna has diversified equivalent apertures. The user downlink adopts an SC-OFDMA system, the terminals are divided into several types according to the antenna aperture, and the initial occupied frequency band and the central frequency point of each type of terminal are calculated, on the basis, the system flexibly plans and schedules resources, so that the user downlink power amplifier is provided with a plurality of single carriers with limited bearing quantity and fixed central frequency point, the power backoff is small, the downlink keeps high-level power efficiency and frequency efficiency on the premise of ensuring the access capability of different types of terminals, and the system communication capacity is improved.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a satellite communication downlink SC-OFDMA frequency allocation method accessed by various terminals.
Background
In order to realize the global depth coverage and the full scene mobile information, the satellite communication must become an important part of the B5G/6G communication. The power limitation of satellite communication systems is the most obvious feature of terrestrial wireless communication systems, resulting in relatively low satellite downlink transmission rates and relatively large subscriber station type antennas. However, the power of the downlink of the base station of the terrestrial mobile communication system is not limited compared with the downlink of the satellite communication system, which is a typical power-limited system, so the downlink system of the terrestrial mobile communication system cannot be directly applied to the downlink of the satellite communication system.
Considering the power amplification characteristic of the satellite communication downlink, if the OFDMA technology is directly adopted, different carriers of multiple users and the high PAPR (peak-to-average power ratio) of the OFDMA cause the very large power backspace of the power amplifier, the power amplifier can be ensured to be in a linear region, so that the efficiency of the downlink power amplifier PA of the satellite communication system is limited, and the downlink capacity of the whole satellite communication system is greatly weakened. In an actual satellite communication system, a user terminal can be divided into an application scene of a unified terminal and a terminal scene of various antenna apertures according to the overall plan of the application system.
In order to increase the communication capacity of the downlink of the satellite communication system, not only the frequency performance of the antenna terminal facing the diversified antenna sizes, but also the power performance of the downlink power amplifier is increased. Therefore, the invention provides a satellite communication downlink SC-OFDMA frequency allocation method accessed by multiple terminals.
Disclosure of Invention
In order to solve the above technical problems, an objective of the present invention is to provide a method for allocating SC-OFDMA frequency in a satellite communication downlink accessed by multiple terminals, so that the satellite communication downlink can satisfy the access capability of multiple user terminals, and at the same time, the system user downlink can maintain high power efficiency and frequency efficiency, thereby comprehensively increasing the system capacity of the whole system.
The technical scheme adopted by the invention is as follows: a satellite communication downlink SC-OFDMA frequency allocation method accessed by multiple terminals comprises the following steps:
1) and (4) planning the overall design of the satellite communication application system, and combing the antenna size of the user terminal and different application scenes corresponding to different service rates. The size of the antenna aperture of the user terminal directly determines the G/T value of the terminal. From the angle of a calculation formula of a downlink transmission link, the transmission rate corresponding to the larger antenna aperture is higher. The satellite communication user terminal antenna is generally planned to be in several standard caliber sizes by comprehensively considering various factors such as design and manufacturing cost and the like. Therefore, two application scenarios are finally divided from the perspective of the antenna aperture size of the user terminal: the first is user terminal resource planning and scheduling with uniform antenna aperture size, and the second is user terminal resource planning and scheduling with diverse antenna aperture size.
2) And (4) planning and scheduling the application scene resources of the user terminal with the unified antenna aperture size. The satellite communication downlink transmission system adopts SC-OFDMA and IFDMA. The IFDMA mode is adopted for planning the downlink full band of the user. The sub-band broadband is planned, the number of the occupied sub-bands is calculated by combining the downlink receiving capacity of the user terminal, the upper limit of different user numbers which can be simultaneously and concurrently downlink is worked out, at the moment, the downlink of the user has only one large carrier, and the power amplifier can work on a 1dB compression point, so that the power amplifier efficiency of the system is highest. In the operation process of the satellite communication application system, aiming at a large number of terminal access requirements, after orthogonal beam domain scheduling, aiming at a large number of terminal access driven by tasks in the same beam, the resource planning scheduling strategy can flexibly select the existing mature resource optimization scheduling allocation strategy, and orthogonal allocation or non-orthogonal allocation is carried out from dimensions such as SC-OFDMA frequency domain, time domain and the like. The SC-OFDMA frequency domain is in an SC-OFDMA single carrier, and the user resource scheduling unit is occupied by one user.
3) And planning and scheduling the application scene resources of the user terminal with various antenna aperture sizes. The user downlink adopts an SC-OFDMA communication system, and particularly adopts an IFDMA mode. Firstly, a satellite application system overall planning terminal is used for fixing the sizes of a plurality of antennae; secondly, planning several types of terminals according to the application system in general, and searching corresponding initial frequency bands and central frequencies; and thirdly, the satellite communication system flexibly plans and schedules resources. Through the three steps, a scheduling method of user resources of various terminals is formulated, so that various terminals can be smoothly accessed into the system, a user downlink power amplifier only bears a plurality of single carriers with limited quantity and fixed central frequency points, the power backoff is small, and the system keeps high-level power efficiency and frequency efficiency.
a) The specific method for fixing the antenna sizes corresponding to the first step satellite application system overall planning terminal in the step 3) is as follows: in the general demonstration design of the satellite communication application system, in the face of user terminals with diversified antenna aperture sizes, whether the user terminals are civil or military satellite communication systems, for the reasons of standardization of system development, high efficiency, cost performance and the like, the terminals are divided into a fixed limited number of types according to the antenna aperture in the general planning of the application system. A plurality of terminal pairs with antenna sizes proposed by a user at the initial stage are classified to a planning terminal closest to the capability of meeting the self requirement, and finally the terminal pairs with fixed antenna sizes and types are subjected to overall planning, so that the application overall planning of the satellite communication system is met.
b) The specific method for finding the corresponding used frequency band and the central frequency in the second step in the step 3) comprises the following steps that a large antenna size terminal in the overall planning of the application system is generally a fixed station, the planning construction site of the large antenna size terminal is relatively fixed, the communication speed is high, the occupied bandwidth is large, the normalized operation is performed, the priority is high, a small antenna size terminal is generally a mobile user, the number of the large antenna size terminal is relatively large, and the task driving access is high.
c) The specific method for flexibly planning and scheduling the resources of the satellite communication system in the third step in the step 3) is as follows: the initial occupied frequency band and the central frequency point corresponding to each terminal found in the step b) are calculated under the condition that the same beam covers the application scene of the beam with the maximum number of the large terminals at the same time, and when the satellite communication system is actually applied, the fixed large terminals in the coverage range of other beams are not so much or not so much, and the initial occupied bandwidth is not needed; in order to improve the spectrum efficiency and maintain the higher power efficiency of the system downlink, a relatively small number of large concurrent terminals are arranged in different beam coverage ranges, and under the condition that the central frequency point of the large terminal is unchanged, the occupied bandwidth of the large terminal is reduced greatly due to the reduction of the number of the concurrent terminals, and a lot of frequency band resources are left; the spare frequency band resources are flexibly distributed to various terminals except the large terminal, but the division principle is that the center frequency point of the formed new dynamic occupied frequency band is required to be fixed. The newly formed center frequency point must be the middle value of the original initial frequency points at both ends.
d) ① combining user geographical position information with beam width of satellite communication system, terminal task dynamic driving system forming orthogonal beam, ② task driving formed orthogonal beam covering a large number of different antenna aperture size terminals, finding out various terminal initial occupied frequency band and central frequency under the application scene of fixed station beam covering the most, on this basis, other beam covering large terminal number reducing and giving off many resources, flexibly and dynamically allocating to non-large terminal, but its central frequency point is fixed frequency point, ③ terminal further resource scheduling in each single carrier frequency band, using existing mature resource scheduling method from SC-OFDMA frequency domain, time domain, etc.
Has the advantages that:
(1) a satellite communication system user terminal is divided into two application scenes of a uniform antenna aperture terminal and a diverse antenna aperture terminal, a downlink adopts SC-OFDMA transmission constitution and has high-efficiency frequency efficiency, the SC-OFDMA frequency allocation method of the satellite communication downlink accessed by the adoption of the high-efficiency diverse terminal can achieve the purposes that ① uniform antenna size terminals or diverse antenna size terminals can be smoothly accessed into a user downlink communication link, a ② downlink power amplifier has small integral power back or works at a power amplifier 1dB compression point and has very high power efficiency, ③ the SC-OFDMA transmission constitution has high-efficiency frequency efficiency, the three points jointly improve the whole communication capacity of the satellite communication system downlink, the processing of the ④ terminal part is simpler, and different equivalent antenna aperture terminals are directly accessed into corresponding frequency bands.
(2) Compared with OFDMA transmission and resource scheduling, the SC-OFDMA frequency allocation method for the satellite communication downlink accessed by the various terminals has the advantages that the backspace of the power amplifier is much smaller, so that the power amplifier is ensured to output higher power; compared to TDM, SC-OFDMA has higher spectral efficiency while having the same excellent power performance.
Drawings
Fig. 1 is a schematic diagram of user downlink resource planning, scheduling and allocation in a scenario where a user terminal applies a uniform antenna aperture in the overall planning of a satellite communication application system.
Fig. 2 is a schematic diagram of user downlink resource planning, scheduling and allocation in a scenario where a user terminal applies to multiple antenna apertures in the overall planning of a satellite communication application system.
Detailed Description
In order to make those skilled in the art better understand the solution of the present invention, the following will make clear and complete description of the solution in the embodiment of the present invention with reference to the drawings in the embodiment of the present invention, and it is obvious that the present invention is applicable to satellite systems, whether single-star or multi-star, with or without inter-satellite links, narrowband multi-beam, and large coverage beam. The invention is suitable for various types of antenna aperture sizes planned in a satellite application system. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a satellite communication downlink SC-OFDMA frequency allocation method accessed by various terminals, which comprises the following steps:
step one, classifying, designing and classifying the ground user terminals according to the size and caliber conditions of the terminal antenna, and classifying the ground user terminals into two application scenes: the first is an application scene that the aperture sizes of the terminal antennas are uniform; the second is an application scene that the aperture sizes of the terminal antenna are various;
step two, aiming at an application scene with uniform terminal antenna aperture size, a satellite communication downlink transmission system adopts SC-OFDMA and IFDMA mode, a user downlink full frequency band adopts IFDMA mode, and the user downlink only has one single downlink large carrier; aiming at the access requirements of a large number of terminals, after orthogonal beam domain scheduling, aiming at the access of a large number of terminals driven by tasks in the same beam, selecting the existing resource optimization scheduling allocation strategy, and performing orthogonal allocation or non-orthogonal allocation from SC-OFDMA frequency domain and time domain dimensions;
step three, aiming at application scenes with various terminal antenna aperture sizes, a user downlink adopts an SC-OFDMA communication system, and specifically adopts an IFDMA mode; the terminal is divided into several fixed antenna size terminals, and on the basis of calculating and planning the initial occupied frequency bands and central frequency points of various terminals, a flexible resource scheduling algorithm is adopted, so that the user downlink power amplifier finally bears several single carriers which are limited in quantity and fixed relative to the central carrier.
In the step one, the classifying and designing the terminal according to the size and the caliber of the terminal antenna specifically means that the terminal of the ground user is divided into several categories according to the caliber of the antenna: the terminals with a plurality of antenna sizes proposed by the ground user at the initial stage are classified into a planning terminal closest to the capability of meeting the self demand, namely a large terminal, a small terminal and a small terminal, and finally the terminal is in accordance with the application overall planning of the satellite communication system.
Example 1
The resource planning and scheduling method for the user terminal application scene with uniform antenna aperture size has been described clearly in the technical scheme 2) because the application scene is simpler and the resource planning and scheduling method is also simpler.
In the specific embodiment, fig. 1 is added to the method for more intuitively displaying, an SC-OFDMA mode is adopted for system downlink, the whole bandwidth resource B allocated and used by a user downlink is used as a terminal, and if the subband width occupied by a single terminal is N1 and K subbands are required for completing task transmission, according to the SC-OFDMA mode, specifically, an IFDMA mode is adopted, the maximum concurrency number is: the value of B/(N1 xK) is rounded. The whole down link works on a single carrier, and the user access resource scheduling allocation can be adopted according to the factors of user priority, task mode and the like: allocation on demand and pre-allocation. And performing on-demand allocation, namely performing orthogonal allocation or non-orthogonal allocation from dimensions such as SC-OFDMA frequency domain, time domain and the like by adopting the existing mature satellite communication on-demand resource allocation scheduling method. The SC-OFDMA frequency domain is in an SC-OFDMA single carrier, and the user resource scheduling unit is a group of subcarriers occupied by one user.
Example 2
The method for calculating the initial occupied frequency band and the central frequency point of each type of terminal in the application scene with diversified terminal antenna aperture sizes specifically comprises the following steps:
step 3.1, the application characteristics of the ground user terminal are described: the large antenna size terminal in the application system overall planning, namely the large terminal, is a fixed station, and has the advantages of fixed planning and construction site, high communication rate, large occupied bandwidth, normalized operation and high priority; the small antenna size terminal is a mobile user, comprises small terminals and extremely small terminals, is relatively large in number, and is relatively large in task driving type access;
step 3.2, determining the initial occupied bandwidth and the center frequency point of each terminal:
step 3.2.1, finding out the wave beam which is covered by the same wave beam with the largest number of large terminals at the same time according to the overall design plan of an application system, finding out the number of concurrent large terminals, calculating the bandwidth required by the large terminals according to an SC-OFDMA system and combining communication speed and communication priority factors, placing the bandwidth on the leftmost side or the rightmost side of a frequency band occupied by a user downlink, and finding out the central frequency of the frequency band occupied by the large terminals;
step 3.2.2, in one or more typical application scenes found in the overall design plan of satellite communication application, counting the respective concurrent number of several types of terminals except a large terminal which are concurrent under the coverage of the same wave beam, and calculating the respective concurrent number proportion;
and 3.2.3, in the step 3.2.1, the distribution is carried out according to the proportion in the step 3.2.2 except the protective frequency band in the residual frequency band resources, so that the initial frequency band occupied by other terminals except the large terminal and the central frequency point are calculated.
Note that the minimum terminal occupation band placement position must be opposite to the large terminal occupation band position.
3.3, calculating initial occupied frequency bands and central frequency points corresponding to various ground user terminals from a wave beam application scene with the maximum number of large terminals covered by the same wave beam, wherein each wave beam occupies a smaller bandwidth and leaves a plurality of frequency band resources due to the reduction of the concurrent number under the condition that the central frequency point of the large terminal is unchanged according to the less or no concurrent number of the large terminals in the wave beam range;
step 3.4, the vacant frequency band resources are flexibly distributed to various terminals with requirements except the large terminal, but the division principle is that the center frequency point of the formed dynamic new occupied frequency band is fixed; the newly formed center frequency point is the middle value of the two original initial frequency points at the two ends.
The resource planning and scheduling method for the application scene of the user terminal with various antenna aperture sizes is complex, and a specific embodiment in one specific implementation here is as follows:
a) the satellite communication applies the overall design planning downlink transmission system and terminal division. The satellite communication downlink adopts a multi-path parallel SC-OFDMA system, and an IFDMA mode is suggested; for example, general demonstration of satellite communication application finally divides user terminals into three categories according to the sizes of antenna apertures: a small antenna size terminal, a large antenna size terminal. The minimum antenna terminal in the practical application system has the characteristics of small size, low communication rate and the like, is generally configured on a miniaturized carrier platform or used as control channel equipment, needs less bandwidth resources, and can be mostly combined with a time-sharing multiplexing mode; the large antenna size terminal is generally a fixed station, the planning construction site of the large antenna size terminal is fixed, the communication rate is high, the normalized operation is realized, and the priority is high; the small terminals are generally mobile users and are relatively large in number. A plurality of terminal user resource scheduling methods are formulated, so that a plurality of terminals can be smoothly accessed into the system, a plurality of single carriers with limited bearing quantity and fixed central frequency points are borne on a user downlink power amplifier, the power backoff is small, and the system keeps high-level power efficiency and frequency efficiency.
b) And determining the center frequency of the occupied frequency band of the large terminal. According to the overall planning of the application system, the beam which is covered by the same beam with the largest number of the large terminals at the same time is found out, and the number of the concurrent large terminals is found out. According to SC-OFDMA system, combining with the factors of communication speed, communication priority and the like, dividing the bandwidth required by a large terminal, and dividing BLarge terminal＝N1*BLarge terminal sub-band*NLarge terminal sub-bandWhere N1 is the maximum number of concurrent co-beam coverage, BLarge terminal sub-bandIs large terminal sub-band width, NLarge terminal sub-bandThe number of subbands occupied by a large terminal. Arrange to the rightmost side of the available bandwidth of the down link, and find the central working frequency point fLarge terminal(ii) a The remaining band resources are dynamically negotiated for allocation between the very small terminal and the small terminal.
c) And determining the occupied frequency band and the central frequency point of the tiny terminal and the tiny terminal. B occupied by large terminal under the condition that the same beam covers the beam with the largest number of large terminals at the same timeLarge terminalAnd fLarge terminalAfter the determination, the remaining band resource is handed to the very small terminal and the small terminal for use. According to general rule of satellite communication applicationFinding the minimum number M of concurrent terminals under the coverage of the same wave beam in a typical application sceneVery small terminal sub-bandAnd the number of concurrent small terminals MSmall terminal sub-band. Calculating the ratio K1 ═ MSmall terminal sub-band/(MVery small terminal sub-band+MSmall terminal sub-band) And K2 ═ MTerminal sub-band/(MVery small terminal sub-band+MSmall terminal sub-band). User downlink bandwidth BDownlink link-BLarge terminalThe left frequency band resource is left after enough safe frequency band interval at two ends according to BSmall terminal＝K1*(BDownlink link-BLarge terminal-2*BSafety partition) And BVery small terminal＝K2*(BDownlink link-BLarge terminal-2*BSafety partition) And determining the bandwidth occupied by the small terminal and the extremely small terminal. The bandwidth occupied by the minimum terminal is placed on the left side of the user downlink frequency band, the bandwidth occupied by the minimum terminal is placed in the middle of the user downlink frequency band, and the central frequency f of the minimum terminal is determined by calculation on the basisVery small terminalAnd small terminal center frequency fSmall terminal. At this time, if the remaining frequency band resources are enough, the concurrent small terminal and the minimum terminal can access the system under the beam; if the frequency band resource is insufficient, the full concurrent access can not be completely met, but a time division multiplexing mode can be added, the speed is slightly reduced, and the number of access users is increased.
d) At the determination of fLarge terminal、fSmall terminal、fVery small terminalOn the basis of the method, resources are flexibly scheduled. f. ofLarge terminal、fSmall terminal、fVery small terminalThe method is designed on the premise that the same beam covers the largest number of large terminals at the same time, other beams actually fix the large terminals not so much or not, and B is not neededLarge terminalThen a large resource; in order to improve the frequency spectrum efficiency and simultaneously have different large terminal concurrency numbers under the condition of keeping higher power amplification efficiency of system downlink under the condition of covering each different wave beam, the frequency spectrum efficiency can be increased by fLarge terminalDetermining the occupied bandwidth B of the large terminal under different beams according to the flexible change and the fixed number of the large terminals as a central frequency pointD Daculu (Chinese character of' Da FinalTerminal endD ═ 0,1, ·, N1-1. Thus BD Large terminal＜BLarge terminalThe state has a lot of band resources left, fLarge terminalThe new frequency band resources appear on both sides, and are dynamically allocated to small terminals or very small terminals for use, but the center frequency is fixed, and the calculation is as follows: f. ofn1＝(fLarge terminal+fSmall terminal) A/2 and fn2＝(fLarge terminal+fDownstream and upstream) /2 wherein fDownstream and upstreamThe user downlink is allocated an upper frequency value of the usage frequency range.
e) Finally, under the application scene of the terminal with various antenna sizes, the downlink form of the satellite communication user is a single carrier signal with 3 to 5 fixed center frequency points. The power back-off is smaller, and under the precondition that the terminal application of different antenna sizes is met, the downlink keeps high-level power efficiency and frequency efficiency, and the communication capacity of the downlink of a system user is improved. Compared with OFDMA transmission, the power amplifier backspacing is much smaller, thereby ensuring that the output power of the power amplifier is higher; compared with TDM, SC-OFDMA has higher spectral efficiency and at the same time has the same excellent power amplifier performance ratio. And f, scheduling large terminal resources according to different concurrent quantities of different types of different wave beams covered on the terminalsLarge terminalFor the center, dynamically allocating occupied bandwidth, small terminal and minimum terminal at fVery small terminal、fSmall terminalAnd BVery small terminal、BSmall terminalOn the basis, if which kind of terminal frequency band resource can not be satisfied, the dynamic calling is performed by fn1And fn2The service objects are dynamically adjusted for two frequency band resources of the center frequency, and can be set as small terminal service resources according to requirements, or as minimum terminal service resources according to requirements, or as small terminal + minimum terminal service resources (one terminal occupies one), and can also dynamically change according to the condition of covering the terminal.
f) ① combining the user geographical position information with the beam width of the satellite communication system, the terminal task dynamic driving system forms orthogonal beams which can use the same frequency resource, ② task driven orthogonal beams cover a large number of terminals with different antenna aperture sizes, 3 initial occupied frequency bands and center frequencies of various terminals are found out under the application scene of the beam covering the most fixed stations, on the basis, the number of large terminals covered by other beams is reduced to give off a lot of resources, the resources are flexibly and dynamically allocated to non-large terminals to use, but the center frequency points are fixed frequency points, ③ further resource scheduling of various terminals in respective single carrier frequency bands, the existing mature resource scheduling method is adopted from the dimensions of SC-OFDMA frequency domain, time domain and the like, the SC-OFDMA frequency domain is a certain type of terminal and an SC-OFDMA frequency domain, and the user resource scheduling unit takes a group of subcarriers occupied by a user as a unit.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. A satellite communication downlink SC-OFDMA frequency allocation method accessed by multiple terminals is characterized by comprising the following steps:
classifying ground user terminals according to the size and caliber conditions of terminal antennas, and dividing the terminals into two application scenes: the first is an application scene that the aperture sizes of the terminal antennas are uniform; the second is an application scene that the aperture sizes of the terminal antenna are various;
step two, in an application scenario with uniform terminal antenna aperture size, a satellite communication downlink transmission system adopts SC-OFDMA and IFDMA, a user downlink full frequency band adopts IFDMA, and the user downlink only has one single downlink large carrier; for a large number of terminal access requirements, after orthogonal beam domain scheduling, aiming at a large number of terminal access driven by tasks in the same beam, selecting the existing resource optimization scheduling allocation strategy, and performing orthogonal allocation or non-orthogonal allocation from SC-OFDMA frequency domain and time domain dimensions;
step three, the sizes of the terminal antenna apertures are various application scenes, and a user downlink adopts an SC-OFDMA communication system, specifically an IFDMA mode; the terminal is divided into several antenna size terminals, and on the basis of calculating and planning initial occupied frequency bands and central frequency points of various terminals, a flexible scheduling resource algorithm is adopted, so that the user downlink power amplifier finally bears several single carriers which are limited in quantity and fixed relative to the central carrier.
2. The method according to claim 1, wherein in the step one, the classifying and designing the terminals according to the size and caliber of the terminal antenna specifically means that the terminals are classified into several categories according to the antenna calibers: the terminals with a plurality of antenna sizes proposed by the ground user at the initial stage are classified into a planning terminal closest to the capability of meeting the self demand, namely a large terminal, a small terminal and a small terminal, and finally the terminal is in accordance with the application overall planning of the satellite communication system.
3. The method for allocating the SC-OFDMA frequency in the satellite communication downlink accessed by multiple terminals according to claim 2, wherein in an application scenario where the sizes of the antenna apertures of the three terminals in the step are diversified, the method for calculating the initial occupied frequency bands and the central frequency points of the various terminals specifically includes the following steps:
step 3.1, the application characteristics of the ground user terminal are described: the large antenna size terminal in the application system overall planning, namely the large terminal, is a fixed station, and has the advantages of fixed planning and construction site, high communication rate, large occupied bandwidth, normalized operation and high priority; the small antenna size terminal is a mobile user, comprises small terminals and extremely small terminals, is relatively large in number, and is relatively large in task driving type access;
step 3.2, determining the initial occupied bandwidth and the center frequency point of each terminal:
step 3.2.1, finding out the wave beam which is covered by the same wave beam with the largest number of large terminals at the same time according to the overall design plan of an application system, finding out the number of concurrent large terminals, calculating the bandwidth required by the large terminals according to an SC-OFDMA system and combining communication speed and communication priority factors, placing the bandwidth on the leftmost side or the rightmost side of a frequency band occupied by a user downlink, and finding out the central frequency of the frequency band occupied by the large terminals;
step 3.2.2, in one or more typical application scenes found in the overall design plan of satellite communication application, counting the respective concurrent number of several types of terminals except a large terminal which are concurrent under the coverage of the same wave beam, and calculating the respective concurrent number proportion;
step 3.2.3, in the step 3.2.1, the distribution is carried out according to the proportion in the step 3.2.2 except the protection frequency band in the residual frequency band resources, so as to calculate the initial frequency band occupied by other terminals except the large terminal and the central frequency point;
the minimum terminal occupation band placement position must be opposite to the large terminal occupation band position.
4. The method according to claim 3, wherein the algorithm for flexibly scheduling resources for the system in the application scenario where the sizes of the antenna apertures of the terminals are diverse in the third step specifically comprises the following procedures:
3.3, calculating initial occupied frequency bands and central frequency points corresponding to various terminals under the condition that the same wave beam covers the wave beam application scene with the maximum large terminal quantity, wherein each wave beam covers fewer or no large terminal concurrency number in the wave beam range, and under the condition that the central frequency point of the large terminal is unchanged, the occupied bandwidth is reduced due to the reduction of the concurrency number, and a plurality of frequency band resources are left;
step 3.4, the vacant frequency band resources are flexibly distributed to various terminals with requirements except the large terminal, but the division principle is that the center frequency point of the formed dynamic new occupied frequency band is fixed; the newly formed center frequency point is the middle value of the two original initial frequency points at the two ends.
5. The method of claim 4, wherein the flexible and efficient allocation is carried out in a manner that ① resources yielded by reduction of large terminal number are flexibly and dynamically allocated to non-large terminals under different beams according to actual conditions of different user terminal distribution and different service driving, wherein the center frequency point is a fixed frequency point, ② further resource scheduling of each ground terminal in a single carrier frequency band is carried out by the SC-OFDMA frequency domain, which is an SC-OFDMA single carrier for a certain terminal, and the user resource scheduling unit is a group of subcarriers occupied by a user.
6. The method of claim 5, wherein the existing resource-optimized scheduling assignment strategy comprises joint fixed pre-assignment mechanism, adaptive joint fixed random assignment, a combination of free and on-demand assignment, burst target on-demand assignment, and a bandwidth resource assignment algorithm based on service priority.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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