CN111148253B - Satellite communication downlink SC-OFDMA frequency allocation method accessed by various terminals - Google Patents

Satellite communication downlink SC-OFDMA frequency allocation method accessed by various terminals Download PDF

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CN111148253B
CN111148253B CN201911413309.2A CN201911413309A CN111148253B CN 111148253 B CN111148253 B CN 111148253B CN 201911413309 A CN201911413309 A CN 201911413309A CN 111148253 B CN111148253 B CN 111148253B
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徐贵州
高西奇
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Network Communication and Security Zijinshan Laboratory
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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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • 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
    • 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 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

Satellite communication downlink SC-OFDMA frequency allocation method accessed by various terminals
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 global deep coverage and full scene mobile information, satellite communication must become an important component of 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 that of the downlink of the satellite communication system, which is a typical power-limited system, so that 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, which can maintain a higher power efficiency and a higher frequency efficiency in the system user downlink while satisfying access capabilities of multiple user terminals in the satellite communication downlink, thereby comprehensively increasing system capacity of the entire 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. And planning to adopt an IFDMA mode to the full frequency band of the downlink of the user. Planning a sub-band broadband, calculating the number of occupied sub-bands by combining with the downlink receiving capacity of a user terminal, and making an upper limit of different user numbers which can simultaneously carry out downlink transmission, wherein the downlink of the user has only one large carrier, and a 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 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, overall planning and planning of the satellite application system to fix the sizes of a plurality of antennae corresponding to a terminal; 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 overall planning and planning terminal of the satellite application system in the first step 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. The terminals with a plurality of antenna sizes proposed by the user in the initial stage are classified to the terminals with fixed antenna sizes and types which are in the standard overall planning, and the terminals are classified to the planning terminals which are closest to the capability of meeting the self requirements, so that the overall planning of the satellite communication system application is finally met.
b) The second step in step 3) is to plan several types of terminals according to the application system as a whole, and the specific method for searching the corresponding frequency band and the center frequency is as follows: the terminal with the large antenna size in the overall planning of the application system is generally a fixed station, and the planning construction site is fixed, the communication rate is high, the occupied bandwidth is large, the normalized operation is realized, and the priority is high; terminals with small antenna sizes are typically mobile users, and are relatively large in number and task-driven access. The method for determining the initial occupied bandwidth and the central frequency point of each terminal adopts the following methods: (1) according to the overall planning of the application system, the beam which is covered by the same beam with the largest number of large terminals (fixed stations) is found out at first, and the number of concurrent large terminals is found out. According to an SC-OFDMA system, dividing a bandwidth required by a large terminal by combining factors such as communication rate, communication priority and the like, placing the bandwidth on the leftmost side or the rightmost side of a user downlink occupied frequency band, and finding out the center frequency (one group or a plurality of groups) of the large terminal occupied frequency band; (2) according to a typical application scene found in the satellite communication application overall planning, counting respective concurrent quantities of several types of terminals except a large terminal (fixed station) which are concurrent under the coverage of the same wave beam, and calculating respective concurrent quantity ratios; (3) and (3) distributing the residual frequency band resources in the step (1) according to the proportion in the step (2) except for the necessary safety interval, thereby calculating the initial frequency band occupied by other terminals except the large terminal and the central frequency point. Note that the minimum terminal occupation band placement position must be opposite to the large terminal occupation band position.
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 with requirements except for large terminals, but the division principle is that the central 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) The downlink resource planning and scheduling of the satellite communication system user comprises the following processes based on the steps: (1) the user geographical position information is combined with the beam width of the satellite communication system, and the terminal task dynamic driving system forms orthogonal beams. These orthogonal beams may use simultaneous co-frequency resources; (2) covering a large number of terminals with different antenna aperture sizes under orthogonal beams formed by task driving, finding out initial occupied frequency bands and center frequencies of various terminals under the application scene of beams covering the most fixed stations, reducing the number of large terminals under the coverage of other beams on the basis of finding out a large number of resources, and flexibly and dynamically allocating the resources to non-large terminals for use, wherein the center frequency points are fixed frequency points; (3) and further resource scheduling of each terminal in each single carrier frequency band, wherein the existing mature resource scheduling method is adopted 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 of a certain type of terminal, and the user resource scheduling unit is a group of subcarriers occupied by a user as a unit.
Has the advantages that:
(1) The user terminal of the satellite communication system is divided into two application scenes of a uniform antenna aperture terminal and a diverse antenna aperture terminal. The downlink adopts SC-OFDMA transmission structure and has high frequency efficiency. The method for allocating SC-OFDMA frequency in the satellite communication downlink by adopting the high-efficiency multiple terminals can achieve the following steps: (1) the uniform antenna size terminal or the multiple antenna size terminal can smoothly access to a user downlink communication link; (2) the whole power back-off of the downlink power amplifier is small or the downlink power amplifier works at a power amplifier 1dB compression point, so that the power efficiency is very high; (3) the use of SC-OFDMA transmission constitutions has a high frequency efficiency. The three points jointly improve the whole communication capacity of a satellite communication system downlink; (4) the terminal portion is simpler to process. And the terminals with different equivalent antenna apertures are directly accessed to the 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 a general 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 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 applicable to various types of antenna caliber size 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 terminal according to the size and caliber condition of the terminal antenna, and classifying the ground user terminal 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, an SC-OFDMA communication system is adopted in a user downlink, and an IFDMA mode is specifically adopted; 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 first step, the classifying and designing the terminal according to the size and caliber of the terminal antenna specifically means that the terminal of the ground user is divided into several categories according to the antenna caliber: 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 the uniform antenna aperture size has been clearly described 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 system for more visual display, an SC-OFDMA mode is adopted for system downlink, the whole bandwidth resource B allocated and used by the 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 task transmission, according to the SC-OFDMA mode, specifically, it is suggested that an IFDMA mode is adopted, the maximum concurrency number is: the value of B/(N1. Multidot.K) 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 a 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 quantity 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 quantity ratio;
and 3.2.3, in the step 3.2.1, distributing the rest frequency band resources except the protection frequency band according to the proportion in the step 3.2.2, thereby calculating the initial frequency bands and the central frequency points occupied by other terminals except the large terminal.
Note that the minimum terminal occupancy band placement location must be opposite to the large terminal occupancy band location.
3.3, calculating initial occupied frequency bands and central frequency points corresponding to various ground user terminals under the condition that the number of the large terminals covered by the same wave beam is the maximum under the wave beam application scene, wherein each wave beam occupies a small bandwidth and leaves a lot 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 fewer 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-channel parallel SC-OFDMA system, and an IFDMA mode is suggested; for example, the general demonstration of the satellite communication application finally divides user terminals into three categories according to the size of the antenna aperture: 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 B Large terminal ＝N1*B Large terminal sub-band *N Large terminal sub-band Where N1 is the maximum number of concurrent co-beam coverage, B Large terminal sub-band Is large terminal sub-band width, N Large terminal sub-band The 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 f Large terminal (ii) a The remaining frequency band resources are dynamically negotiated for allocation between the very small terminal and the small terminal.
c) And the frequency band occupied by the tiny terminal and the central frequency point are determined. 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 time Large terminal And f Large terminal After the determination, the remaining band resource is handed to the very small terminal and the small terminal for use. According to the typical application scene found in the satellite communication application overall planning, the number M of concurrent tiny terminals under the same beam coverage Sub-band for very small terminals And the number of concurrent small terminals M Small terminal sub-band . Calculating the ratio K1= M Small terminal sub-band /(M Sub-band for very small terminals +M Small terminal sub-band ) And K2= M Terminal sub-band /(M Sub-band for very small terminals +M Small terminal sub-band ). User downlink bandwidth B Downlink link -B Large terminal The left frequency band resource is left after enough safe frequency band interval at two ends according to B Small terminal ＝K1*(B Downlink link -B Large terminal -2*B Safety partition ) And B Very small terminal ＝K2*(B Downlink link -B Large terminal -2*B Safety spacer ) And determining the bandwidth occupied by the small terminal and the extremely small terminal. The bandwidth occupied by the very small terminal is placed on the left side of the user downlink frequency band, and the bandwidth occupied by the small terminal is placed in the user downlink frequency bandRespectively calculating and determining the minimum terminal center frequency f on the basis Very small terminal And small terminal center frequency f Small 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 f Large terminal 、f Small terminal 、f Very small terminal On the basis of the method, resources are flexibly scheduled. f. of Large terminal 、f Small terminal 、f Very small terminal The 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 needed Large terminal Then 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 f Large terminal Determining 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 point D Large terminal D =0,1,. N1-1. Thus B D Large terminal ＜B Large terminal The state has a lot of band resources left, f Large terminal The 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. of n1 ＝(f Large terminal +f Small terminal ) A combination of/2 and f n2 ＝(f Large terminal +f Downstream and upstream ) /2, wherein f Downstream and upstream The 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. Power amplifier backoff compared to OFDMA transmissionThe 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 terminals Large terminal For the center, dynamically allocating occupied bandwidth, small terminal and minimum terminal at f Very small terminal 、f Small terminal And B Very small terminal 、B Small terminal On the basis, if which type of terminal frequency band resource can not be satisfied, the dynamic calling is carried out by f n1 And f n2 The 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) The downlink resource planning and scheduling of the satellite communication system user comprises the following processes based on the steps: (1) the user geographical position information is combined with the beam width of the satellite communication system, and the terminal task dynamic driving system forms orthogonal beams. These orthogonal beams may use simultaneous co-frequency resources; (2) covering a large number of terminals with different antenna aperture sizes under orthogonal beams formed by task driving, finding out 3 initial occupied frequency bands and center frequencies of various terminals under the application scene of beams covering the most fixed stations, reducing the number of large terminals covered by other beams on the basis of finding out a lot of resources, and flexibly and dynamically allocating the resources to non-large terminals for use, wherein the center frequency points are fixed frequency points; (3) and further resource scheduling of each terminal in the respective single carrier frequency band, wherein 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 in an SC-OFDMA single carrier of a certain type of terminal, and the user resource scheduling unit is 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 (5)

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 (Single Carrier-orthogonal frequency division multiple Access), an IFDMA (orthogonal frequency division multiple Access) mode is adopted, a user downlink full frequency band adopts the IFDMA mode, 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; dividing the terminals into several antenna size terminals, and adopting a flexible scheduling resource algorithm on the basis of calculating and planning initial occupied frequency bands and central frequency points of various terminals to finally enable a user downlink power amplifier to bear a plurality of single carriers which are limited in quantity and fixed relative to a central carrier;
the resource algorithm flexibly scheduled by the system in the application scenario in which the terminal antenna aperture sizes are diversified in the third step specifically comprises the following processes:
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 has small 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 and the spare frequency band resources are increased due to the reduction of the concurrency number;
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.
2. The method according to claim 1, wherein in the first step, the classifying and designing the terminals according to the size and aperture of the terminal antenna specifically means that the terminals are classified into several categories according to the antenna aperture: the terminals with a plurality of antenna sizes proposed by the ground user in 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 meets 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, the planning construction site of the large antenna size terminal is fixed, and the communication rate is high; the small antenna size terminal is a mobile user and comprises a small terminal and a minimum terminal;
step 3.2, determining the initial occupied bandwidth and the center frequency point of each terminal:
step 3.2.1, according to the overall design plan of an application system, finding out the wave beam which is covered by the same wave beam with the largest number of large terminals at the same time, 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 quantity 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 quantity ratio;
step 3.2.3, in the step 3.2.1, the allocation of the remaining frequency band resources except the protection frequency band is performed according to the proportion in the step 3.2.2, so that the initial frequency band and the central frequency point occupied by other terminals except the large terminal are calculated;
the minimum terminal occupied band placement location must be opposite to the large terminal occupied band location.
4. The method of claim 1, wherein the flexible allocation to various types of terminals except a large terminal is performed by: (1) according to the actual conditions that user terminals are different in distribution and different in service driving under different wave beams, the number of large terminals is reduced, the yielded resources are reduced, the resources are flexibly and dynamically distributed to non-large terminals for use, and the central frequency point is a fixed frequency point; (2) further resource scheduling of each ground terminal in each single carrier frequency band by adopting the existing mature resource scheduling method from SC-OFDMA frequency domain and time domain dimensions; the SC-OFDMA frequency domain is in an SC-OFDMA single carrier of a certain type of terminal, and the user resource scheduling unit is a group of subcarriers occupied by a user as a unit.
5. The method of claim 4, wherein the existing resource-optimized scheduling assignment strategy comprises joint fixed pre-assignment mechanism, adaptive joint fixed random assignment, combination of free and on-demand assignment, burst target on-demand assignment, and bandwidth resource assignment algorithm based on service priority.
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