CN112468204A - Resource allocation method, device, storage medium and satellite communication system - Google Patents
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Abstract
The application discloses a resource allocation method, a resource allocation device, a storage medium and a satellite communication system, wherein the method comprises the following steps: determining the distance between a target satellite and a gateway according to the position of the target satellite, using a resource value set corresponding to the distance range to which the distance belongs as a resource value set of the target satellite according to a preset corresponding relation between the distance range and the resource value set, wherein the minimum resource value in the resource value set corresponding to any distance range ensures the demodulation performance of a terminal in the coverage area of the satellite of which the distance between the target satellite and the gateway belongs to the distance range, the smaller the minimum distance value of at least part of the distance range in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is, and the resource value configured for the terminal in the ground coverage area of the target satellite is selected from the resource value set of the target satellite. The method and the device can improve the resource utilization rate of the satellite communication system on the premise of ensuring the demodulation performance required by the terminal.
Description
Technical Field
The present application relates to the field of satellite communications, and in particular, to a resource allocation method, device, storage medium, and satellite communication system.
Background
In a satellite communication system, a Base Band Unit (BBU) access network in a gateway station establishes a communication link with a satellite, the gateway station may be connected to multiple satellites simultaneously, any one satellite may project one or more beams to the ground, any beam projected by the satellite is projected to the ground, a coverage area of the beam on the ground is referred to as a ground cell, and the beam in the gateway station access network corresponds to a cell (the cell is equivalent to the ground cell). And when the terminal enters the ground cell, the terminal is accessed to a cell corresponding to the ground cell in the gateway station access network through the satellite relay, so that the communication between the terminal and the gateway station is realized.
In the process of communicating between a terminal and a gateway station by a satellite relay method, radio resources (hereinafter, referred to as resources for convenience of description) are required, for example, the number of periodic transmissions of a synchronous broadcast Block (SS/PBCH Block, SSB), the number of demodulation Reference Signal (DMRS) symbols, the number of Cell Reference Signal (CRS) symbols, a Physical Random Access Channel (PRACH) format, a Physical Uplink Control Channel (PUCCH) multiplexing capability, and the like.
How to improve the utilization rate of resources in a satellite communication system on the premise of ensuring the demodulation performance required by a terminal is an urgent problem to be solved.
Disclosure of Invention
The application provides a resource allocation method, a resource allocation device, a storage medium and a satellite communication system, and aims to improve the utilization rate of resources in the satellite communication system on the premise of ensuring demodulation performance required by a terminal.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a resource allocation method, which is applied to a gateway station and comprises the following steps:
determining the distance between the target satellite and the gateway according to the position of the target satellite; the target satellite is any satellite which establishes a communication link with the gateway station;
according to a preset corresponding relation between a distance range and a resource value set, taking the resource value set corresponding to the distance range to which the distance belongs as a resource value set of the target satellite; when the distance between the target satellite and the gateway belongs to the distance range, the minimum resource value in the resource value set corresponding to the distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite; in at least part of the distance ranges in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is;
and selecting a resource value configured for a terminal in a ground coverage area of the target satellite from the resource value set of the target satellite.
Optionally, in at least a part of the distance ranges in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is, the following steps are included:
in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
Optionally, the resource value set corresponding to any distance range includes: the preset distance values forming the distance range respectively correspond to preset resource values; the preset resource value corresponding to any preset distance value refers to: a minimum resource value for ensuring demodulation performance required by a terminal within a coverage area of the target satellite in a case where a distance between the target satellite and the gateway belongs to a target distance range; for the minimum preset distance value constituting the distance range, the target distance range is the distance range; for the maximum preset distance value constituting the distance range, the target distance range is any distance range in the distance ranges, in which the maximum preset distance value is the minimum distance value.
Optionally, the selecting, from the resource value set of the target satellite, a resource value configured for a terminal in a terrestrial coverage area of the target satellite includes:
and under the condition that a plurality of satellite cells exist in the target satellite, according to the principle that the larger the distance between a coverage area formed by any one satellite cell on the ground and the target satellite is, the larger the resource value configured for the terminal in the coverage area of the satellite cell on the ground is, the resource value configured for the terminal in the coverage area of each satellite cell is from the resource value set of the target satellite.
Optionally, the preset distance ranges are not overlapped with each other.
Optionally, the determining a distance between the target satellite and the gateway according to the position of the target satellite includes:
and determining the distance between the target satellite and the gateway according to the position of the target satellite every preset time.
Optionally, after selecting, from the resource value set of the target satellite, a resource value configured for a terminal in a coverage area of the target satellite on the ground, the method further includes:
and respectively sending corresponding resource values to terminals in the ground coverage area of each satellite cell of the target satellite.
Optionally, the corresponding resource value is sent to a terminal in an area covered by any satellite cell of the target satellite on the ground in a broadcast or RRC message manner.
The present application further provides a resource allocation apparatus, including:
the first determining module is used for determining the distance between the target satellite and the gateway according to the position of the target satellite; the target satellite is any satellite which establishes a communication link with the gateway station;
a second determining module, configured to use the resource value set corresponding to the distance range to which the distance belongs as the resource value set of the target satellite according to a preset correspondence between the distance range and the resource value set; when the distance between the target satellite and the gateway belongs to the distance range, the minimum resource value in the resource value set corresponding to the distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite; in at least part of the distance ranges in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is;
and the selecting module is used for selecting a resource value configured for the terminal in the ground coverage area of the target satellite from the resource value set of the target satellite.
Optionally, in at least a part of the distance range in the second determining module, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is, the following steps are included:
in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
Optionally, the resource value set corresponding to any one of the distance ranges in the second determining module includes: the preset distance values forming the distance range respectively correspond to preset resource values; the preset resource value corresponding to any preset distance value refers to: a minimum resource value for ensuring demodulation performance required by a terminal within a coverage area of the target satellite in a case where a distance between the target satellite and the gateway belongs to a target distance range; for the minimum preset distance value constituting the distance range, the target distance range is the distance range; for the maximum preset distance value constituting the distance range, the target distance range is any distance range in the distance ranges, in which the maximum preset distance value is the minimum distance value.
Optionally, the selecting module is configured to select, from the resource value set of the target satellite, a resource value configured for a terminal in a coverage area of the target satellite on the ground, and includes:
the selecting module is specifically configured to, when the target satellite has multiple satellite cells, configure a resource value for a terminal in a coverage area of each satellite cell from a set of resource values of the target satellite according to a principle that a larger distance between a coverage area formed by any one of the satellite cells on the ground and the target satellite increases a resource value configured for the terminal in the coverage area of the satellite cell on the ground.
Optionally, the preset distance ranges in the second determining module do not overlap with each other.
Optionally, the first determining module is configured to determine a distance between the target satellite and the gateway according to a position of the target satellite, and includes:
the first determining module is specifically configured to determine, every preset time interval, a distance between the target satellite and the gateway according to the position of the target satellite.
Optionally, the method further includes: and a sending module, configured to send corresponding resource values to terminals in the terrestrial coverage areas of the satellite cells of the target satellite respectively after selecting the resource values configured for the terminals in the terrestrial coverage areas of the target satellite from the resource value set of the target satellite.
Optionally, the sending module is configured to send the corresponding resource values to terminals in the coverage area of each satellite cell of the target satellite on the ground, where the sending module includes:
the sending module is specifically configured to send, to a terminal in an area covered by any satellite cell of the target satellite on the ground, a corresponding resource value in a broadcast or RRC message manner.
The present application also provides a readable storage medium comprising: the storage medium includes a stored program, wherein the program performs any of the resource allocation methods described above.
The present application further provides a satellite communication system, comprising: satellites, gateway stations and terminals;
the terminal and the gateway station communicate through the satellite relay;
the gateway station applies any of the methods described above.
In the resource allocation method, the device, the storage medium and the satellite communication system, the gateway station determines the distance between the target satellite and the gateway station according to the position of the target satellite, wherein the target satellite is any satellite establishing a communication link with the gateway station, and the resource value set corresponding to the distance range to which the distance belongs is used as the resource value set of the target satellite according to the preset corresponding relation between the distance range and the resource value set. From the set of resource values of the target satellite, a resource value is selected that is configured for a terminal within the terrestrial coverage area of the target satellite.
Because the minimum resource value in the resource value sets corresponding to any distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite under the condition that the distance between the target satellite and the gateway belongs to the distance range, the resource value selected from the resource value set of the target satellite and configured for the terminal in the terrestrial coverage area of the target satellite can ensure the demodulation performance of the terminal.
In the moving process of the target satellite, when different distances between the target satellite and the gateway belong to different distance ranges, the minimum distance value in the distance range is smaller in at least part of the distance ranges in the distance range, and the minimum resource value in the resource value set corresponding to the distance range is smaller, so that the resource value allocated to the satellite with the smaller distance between the target satellite and the gateway is smaller. Therefore, compared with the prior art that a unified resource value is adopted, the scheme of the application can distribute the resource value of the satellite with the smaller distance from the gateway to be smaller than the unified resource value adopted in the prior art, and therefore the scheme provided by the application can improve the resource utilization rate of the satellite communication system. Therefore, by adopting the scheme provided by the application, the resource utilization rate of the satellite communication system can be improved on the premise of ensuring the demodulation performance required by the terminal.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a satellite communication system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a resource allocation method disclosed in an embodiment of the present application;
FIG. 3 is a schematic diagram of a process for determining a set of distance ranges and resource values according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a resource allocation apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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 application.
The inventor of the present application found in research that, in a satellite communication system, a satellite moves according to a preset orbit, and during the movement, a distance between the satellite and a gateway changes, that is, during a communication process between a terminal and the gateway through a satellite relay, total distances between the terminal and the satellite and between the satellite and the gateway change, in order to ensure demodulation performance required by the terminal during the communication process, the gateway needs to configure a resource value for the terminal, and if a fixed resource value is configured for the terminal in the existing terrestrial communication system, in the satellite communication system, when the distance between the satellite and the gateway is small, the demodulation performance required by the terminal can be satisfied by using the fixed resource value, but resource waste can be caused. Therefore, in the embodiment of the present application, on the premise of ensuring the demodulation performance required by the terminal, different resource values are allocated to terminals in a satellite coverage area with different distances from the gateway, and the smaller the distance is, the smaller the allocated resource value is, so that on the premise of ensuring the demodulation performance required by the terminal in the satellite communication system, the utilization rate of the resource is improved.
The embodiment of the application is suitable for a satellite communication system, and is particularly suitable for a low-orbit satellite communication system and a medium-orbit satellite communication system. For convenience of description, the present embodiment of the application refers to a gateway station and any one satellite that establishes a communication link with the gateway station as an example, and introduces a process in which the gateway station configures resources for the satellite.
Fig. 1 is a schematic view of a scenario of a satellite information system according to an embodiment of the present application, and it can be seen from fig. 1 that there are 5 satellites, namely, a satellite 1, a satellite 2, a satellite 3, a satellite 4, and a satellite 5, which establish a communication link with a gateway station. During the satellite movement, the distances between the satellite 1, the satellite 2, the satellite 3, the satellite 4 and the satellite 5 and the gateway are different. Assuming that the satellite 5 is a target satellite, the satellite 5 has three satellite cells, which are a satellite cell 1, a satellite cell 2 and a satellite cell 3 in sequence from left to right, wherein the distance from the satellite cell 2 to the target satellite is the smallest.
Fig. 2 is a resource allocation method provided in an embodiment of the present application, including the following steps:
s201, under the condition that a preset trigger condition is met, determining the distance between the target satellite and the gateway according to the position of the target satellite in the ephemeris information.
In this step, the preset trigger condition may be that the time reaches a preset time, specifically, the preset time is arranged according to the sequence of the preset time, and the time duration between two adjacent preset times may be a preset time duration. The value of the preset duration can be determined according to actual conditions, and the value of the preset duration is not limited in this embodiment.
The method includes determining a distance between a target satellite and a gateway at any preset time according to a position of the target satellite at the preset time when the target satellite in ephemeris information reaches the preset time, and specifically, a calculation method for calculating the distance between the satellite and the gateway according to the position of the satellite is the prior art and is not repeated herein.
S202, according to the preset corresponding relation between the distance range and the resource value set, the resource value set corresponding to the distance range to which the distance belongs is used as the resource value set of the target satellite.
In the present embodiment, a plurality of distance ranges are set in advance, and a resource value set is set in advance for each distance range. In addition, the preset distance ranges may not overlap with each other or overlap with each other, and the embodiment does not limit whether the preset distance ranges overlap with each other.
The distance range and the corresponding resource value set need to satisfy the following two conditions:
the first condition is that: the minimum resource value in the resource value set corresponding to any distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite under the condition that the distance between the target satellite and the gateway belongs to the distance range.
The second condition is that: in at least part of the distance range in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
Optionally, in this embodiment, in all the distance ranges, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
Optionally, in this embodiment, the resource value set corresponding to any distance range includes: and the preset distance values forming the distance range respectively correspond to preset resource values. Wherein, the preset resource value corresponding to any preset distance value refers to: a minimum resource value that ensures demodulation performance required by a terminal within a coverage area of a target satellite in a case where a distance between the target satellite and a gateway belongs to a target distance range in which the minimum distance value is the distance value among the distance ranges.
Specifically, how to set the distance range and the resource value set corresponding to the distance range is described in the following embodiment corresponding to fig. 3. Of course, the embodiment corresponding to fig. 3 is only one implementation manner, and the embodiment does not limit the specific implementation manner.
In this embodiment, in the preset correspondence relationship between the distance ranges and the resource value sets, when the distance ranges do not overlap with each other, the resource value set corresponding to the distance range to which the distance belongs is unique. In the case that there is an overlap between the distance ranges, there may be a plurality of distance ranges to which the distances belong, and the manner of selecting the resource value set of the target satellite from the resource sets respectively corresponding to the plurality of distance ranges to which the distances belong may include: and taking the resource value set with the minimum resource value in the resource value sets respectively corresponding to the distance sets to which the distances belong as the resource value set of the target satellite. Of course, in practice, other manners may also be adopted to select the resource value set of the target satellite from the resource value sets respectively corresponding to the plurality of distance ranges to which the distances belong.
S203, selecting a resource value configured for the terminal in the ground coverage area of the target satellite from the resource value set of the target satellite.
In this embodiment, the resource value set includes at least one resource value, wherein there may be a plurality of resource values in the resource value set. There may be one or more satellite cells for the target satellite. The following describes a manner of allocating resource values to terminals in a coverage area of a satellite cell, respectively, for a target satellite having only one satellite cell and a target satellite having a plurality of satellite cells:
in the case where there is only one satellite cell of the target satellite, since the minimum resource value in the set of resource values of the target satellite can ensure the demodulation performance required by the terminal in the satellite coverage area where the distance from the terminal to the gateway belongs to the distance range, the minimum resource value in the set of resource values of the target satellite can be used as the resource value of the terminal in the coverage area of the current target satellite.
In this embodiment, resource values are allocated to terminals in coverage areas of different satellite cells from a set of resource values of a target satellite on the basis of the principle that the larger the distance between the coverage area of a satellite cell and the satellite, the larger the resource value allocated to the terminal in the coverage area of the satellite cell is.
And S204, sending the configured resource value to a terminal in the coverage area of the target satellite.
Specifically, in this step, the gateway station may transmit the corresponding resource value to the terminals in the coverage area of each satellite cell in a broadcast or RRC message manner.
For example, for the satellite cell 1, if the resource is the number of SSB periodic transmissions, and the number of SSB periodic transmissions allocated to the satellite cell 1 in S203 is 4, in this step, the number of SSB periodic transmissions transmitted by the gateway station to the terminal in the coverage area of the satellite cell 1 is 4.
In this embodiment, since the minimum resource value in the resource value sets corresponding to any distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite when the distance between the target satellite and the gateway belongs to the distance range, the resource value configured for the terminal in the terrestrial coverage area of the target satellite selected from the resource value set of the target satellite can ensure the demodulation performance of the terminal.
In the moving process of the target satellite, when different distances between the target satellite and the gateway belong to different distance ranges, the minimum distance value in the distance range is smaller in at least part of the distance ranges in the distance range, and the minimum resource value in the resource value set corresponding to the distance range is smaller, so that the resource value allocated to the satellite with the smaller distance between the target satellite and the gateway is smaller. Therefore, compared with the prior art that a unified resource value is adopted, the scheme of the application can distribute the resource value of the satellite with the smaller distance from the gateway to be smaller than the unified resource value adopted in the prior art, and therefore the scheme provided by the application can improve the resource utilization rate of the satellite communication system. Therefore, by adopting the scheme provided by the application, the resource utilization rate of the satellite communication system can be improved on the premise of ensuring the demodulation performance required by the terminal.
For each resource, the distance range and the resource value set are determined according to the same principle, and a resource (SSB periodic transmission times) is described as an example below, specifically, as shown in fig. 3, fig. 3 is a process for determining the distance range and the resource value set provided by the embodiment of the present application, and includes the following steps:
s301, obtaining a minimum resource value that can ensure demodulation performance required by the terminal under each of the preset plurality of distance values, and obtaining a minimum resource value corresponding to each of the preset plurality of distance values.
In this step, the preset distance values are distances between the target satellite and the gateway at each preset position when the target satellite is located at different preset positions during the movement of the target satellite on the preset orbit.
In this step, the minimum resource value corresponding to each of the preset distance values may be obtained in two ways, one way is through manual measurement, and the other way is through a preset formula.
Specifically, for any one preset distance value, the formula for determining the resource value under the distance value may be as follows:
in the formula, CellconfigDL represents a downlink resource value, Distance _ Feeder is a Distance between a target satellite and a gateway station, TXgNB is a gateway station transmitter performance, rxdelay is a satellite receiver performance, Power _ Feedermax is a Feeder link maximum transmission Power, and α is a Feeder link adjustment factor. Distance _ Service is the Distance between the target satellite and the terminal, txdelay is the satellite transmitter performance, RXUE is the terminal receiver performance, Power _ Servicemax is the user link maximum transmit Power, β is the user link adjustment factor, χ is the adjustment factor, such as the demodulation performance difference requirement.
In the formula, CellconfigUL represents an uplink resource value, RXgNB is a target satellite transmitter performance, TXrelay is a gateway station receiver performance, δ is a feeder link adjustment factor, ε is a user link adjustment factor, RXrelay is a satellite receiver performance, TXUE is a terminal transmission performance, and φ is an adjustment factor, such as a demodulation performance difference requirement.
In the formula, the values of α, β, χ, δ, ε, and φ may be determined in practice, and specifically, may be determined by manually collecting data, including: and determining values of alpha, beta, chi, delta, epsilon and phi according to the acquired data. Of course, the values of these parameters may also be determined in other manners, and this embodiment does not limit the specific implementation manner.
S302, arranging the preset distance values in the order from small to large, and selecting the distance values from the preset distance values.
Specifically, the manner of selecting the distance value is not limited in this embodiment.
And S303, taking the distance range formed by the two selected distance values and the positive and negative infinity values as a distance range.
For example, the selected distance values are N1, N2, and N3, respectively, where N1< N2< N3, constituting a distance range including (negative infinity, N1), (N1, N2), (N2, N3), and (N3, positive infinity). Wherein the obtained distance ranges do not overlap each other.
In this embodiment, there may also be an overlap between the distance ranges obtained in this step, for example, the distance range formed by N1, N2, and N3 may include: (negative infinity, N1), (N1, N2), (N2, N3), (N3, positive infinity), and (N1, N3), wherein (N1, N2) and (N1, N3) are distance ranges having an overlap.
S304, determining the resource values corresponding to the minimum distance value and the maximum distance value in each distance range respectively.
And aiming at any selected distance range, determining a target distance range corresponding to the minimum distance value and the maximum distance value of the distance range respectively. Wherein the target distance range of the minimum distance value is the distance range. The target distance range of the maximum distance value is any distance range in which the maximum distance value is the minimum distance value among the determined distance ranges.
The resource value corresponding to the minimum distance value is: and under the condition that the distance between the target satellite and the gateway belongs to the target distance range corresponding to the minimum distance value, ensuring the minimum resource value of the demodulation performance of the terminal in the coverage area of the target satellite. The resource value corresponding to the maximum distance value is as follows: and ensuring the minimum resource value of the demodulation performance of the terminal in the coverage area of the target satellite under the condition that the distance between the target satellite and the gateway belongs to the target distance range corresponding to the maximum distance value.
Taking the distance range (N1, N2) as an example, the target distance range corresponding to N1 is (N1, N2), and the maximum resource value in the minimum resource values respectively corresponding to the preset distance values belonging to (N1, N2) is taken as the resource value corresponding to N1. Taking the distance value as (N1, N3) as an example, the target distance range corresponding to N1 is (N1, N3), and the maximum resource value in the minimum resource values respectively corresponding to the preset distance values belonging to (N1, N3) is taken as the resource value corresponding to N1.
S305, regarding any distance range, taking a set formed by the resource values respectively corresponding to the maximum distance value and the minimum distance value in the distance range as a resource value set corresponding to the distance range.
For example, assume that the resource is the SSB cycle transmission count, the SSB cycle transmission count corresponding to N1 is 2, the SSB cycle transmission count corresponding to N2 is 4, and the SSB cycle transmission count corresponding to N3 is 8.
For the distance range formed by N1 and N2, the resource value set corresponding to the distance range is {2,4}, for the distance range formed by N2 and N3, the resource value set corresponding to the distance range is {4,8}, for the distance range formed by N1, the resource value set corresponding to the distance range is {2}, and for the distance range formed by N3 and N1, the resource value set corresponding to the distance range is {8 }.
It should be noted that, in this embodiment of the present application, for a resource whose resource value may be a non-integer, in this step, the resource value set corresponding to any distance range determined represents: and when the distance between the target satellite and the gateway belongs to the distance range, the value of the resource is from the minimum resource value to the maximum resource value in the resource value set.
For the resource whose resource value can only take integer, in this step, the resource value set corresponding to any one determined distance range represents: when the distance between the target satellite and the gateway belongs to the distance range, the value of the resource is any integer resource value from the minimum resource value to the maximum resource value in the resource value set.
No matter whether the resource value can be an integer or not, under the condition that only one resource value is included in the resource value set corresponding to the distance range, when the distance between the target satellite and the gateway belongs to the distance range, the minimum value of the resource value is the resource value in the resource value set.
In this embodiment, the union of the resource value sets respectively corresponding to all the distance ranges is used as the value range of the target satellite in the resource. For multiple resources, the value range of the target satellite under each resource, and the system overhead range are shown in table 1 below. For any resource, under the condition that the target satellite takes any value in the value range of the resource, the system overhead value represents the percentage of the downlink physical layer resource overhead in the total resource quantity of the downlink physical layer or the percentage of the uplink physical layer resource overhead in the total resource quantity of the uplink physical layer.
TABLE 1
| Cell radio resource parameter item | Value Range example | System overhead Range example |
| Number of SSB |
2/4/8 | 0.11％/0.22％/0.43％ |
| Number of |
2/3/4 | 14.3％、21.4％、28.6％ |
| Number of |
1/2 | 7.1％、14.3％ |
| PRACH Format | Format1/2/3/4 | 0.4％/0.9％/2％/3.4％ |
| PUCCH format1 multiplexing capability | 1-72 | 21.9％-0.4％ |
| SRS multi-user multiplexing capability | 1-32 | 14.3％-0.45％ |
| PDCCH |
4/8/16/32 | 14.3％/21.4％/21.4％ |
| Uplink and downlink MCS range | 0-28 | Channel prejudging, fast self-adapting |
| Uplink and downlink PSD range | PmaxPmin | Channel prejudging, fast self-adapting |
It should be noted that, the process of determining the distance range and the resource value set corresponding to each distance range is determined by taking a target satellite as an example, and certainly, in practice, other satellites establishing a communication link with the gateway station may also be used as reference satellites to determine the distance range and the resource value set corresponding to each distance range.
The demodulation performance required by the terminal in the coverage area of the satellite whose distance from the gateway belongs to the distance range can be ensured as long as the minimum resource value in the resource value set corresponding to each distance range is the smallest, and in at least part of the obtained distance ranges, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is, so as to ensure that the resource value configured by the satellite whose distance from the gateway is the smaller is smaller.
Fig. 4 is a resource allocation apparatus provided in an embodiment of the present application, including: a first determination module 401, a second determination module 402 and a selection module 403,.
The first determining module 401 is configured to determine a distance between a target satellite and a gateway station according to a position of the target satellite, where the target satellite is any satellite that establishes a communication link with the gateway station.
The second determining module 402 is configured to, according to a preset correspondence between a distance range and a resource value set, use a resource value set corresponding to the distance range to which the distance belongs as a resource value set of the target satellite; under the condition that the distance between the target satellite and the gateway belongs to the distance range, the minimum resource value in the resource value set corresponding to the distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite; in at least part of the distance range in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
The selecting module 403 is configured to select, from the set of resource values of the target satellite, a resource value configured for a terminal in a terrestrial coverage area of the target satellite.
Optionally, the second determining module 402 is configured to use, according to a preset corresponding relationship between the distance range and the resource value set, the resource value set corresponding to the distance range to which the distance belongs as the resource value set of the target satellite, where, in at least a part of the distance range within the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is, and the method includes:
the second determining module 402 is specifically configured to use a resource value set corresponding to a distance range to which the distance belongs as a resource value set of the target satellite according to a preset correspondence between the distance range and the resource value set; in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
Optionally, the resource value set corresponding to any distance range includes: the preset resource values corresponding to the preset distance values forming the distance range respectively, and the preset resource value corresponding to any preset distance value refers to: ensuring a minimum resource value of demodulation performance required by a terminal in a coverage area of a target satellite under the condition that the distance between the target satellite and a gateway belongs to a target distance range; for the minimum preset distance value constituting the distance range, the target distance range is the distance range; for the maximum preset distance value constituting the distance range, the target distance range is any distance range in the distance ranges, in which the maximum preset distance value is the minimum distance value.
Optionally, the selecting module 403 is configured to select, from the set of resource values of the target satellite, a resource value configured for a terminal in a terrestrial coverage area of the target satellite, including:
the selecting module 403 is specifically configured to, when the target satellite has multiple satellite cells, configure a resource value for a terminal in a coverage area of each satellite cell from a set of resource values of the target satellite according to a principle that the larger the distance between a coverage area formed by any satellite cell on the ground and the target satellite is, the larger the resource value configured for the terminal in the coverage area of the satellite cell on the ground is.
Optionally, the determining module 401 is configured to determine the distance between the target satellite and the gateway according to the position of the target satellite, and includes:
the determining module 401 is specifically configured to determine, every preset time interval, a distance between the target satellite and the gateway according to the position of the target satellite.
Optionally, the preset distance ranges are not overlapped with each other.
Optionally, the apparatus further comprises: a sending module 404, configured to, after selecting a resource value configured for a terminal in an earth coverage area of the target satellite from the resource value set of the target satellite, send the corresponding resource value to terminals in the earth coverage area of each satellite cell of the target satellite.
Optionally, the sending module 404 sends the corresponding resource value to a terminal in an area covered by any satellite cell of the target satellite on the ground in a broadcast or RRC message manner.
An embodiment of the present application further provides a storage medium including a stored program, where the program executes any one of the resource allocation methods described above.
An embodiment of the present application further provides a satellite communication system, including: the system comprises a gateway station, a satellite and a terminal, wherein the gateway station is provided with a resource allocation device corresponding to the resource allocation device shown in figure 4.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A resource allocation method, applied to a gateway station, includes:
determining the distance between the target satellite and the gateway according to the position of the target satellite; the target satellite is any satellite which establishes a communication link with the gateway station;
according to a preset corresponding relation between a distance range and a resource value set, taking the resource value set corresponding to the distance range to which the distance belongs as a resource value set of the target satellite; when the distance between the target satellite and the gateway belongs to the distance range, the minimum resource value in the resource value set corresponding to the distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite; in at least part of the distance ranges in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is;
and selecting a resource value configured for a terminal in a ground coverage area of the target satellite from the resource value set of the target satellite.
2. The method according to claim 1, wherein in at least some distance ranges within the distance range, the smaller the minimum distance value in the distance range, the smaller the minimum resource value in the resource value set corresponding to the distance range, includes:
in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is.
3. The method of claim 1, wherein the resource value set corresponding to any one of the distance ranges comprises: the preset distance values forming the distance range respectively correspond to preset resource values; the preset resource value corresponding to any preset distance value refers to: a minimum resource value for ensuring demodulation performance required by a terminal within a coverage area of the target satellite in a case where a distance between the target satellite and the gateway belongs to a target distance range; for the minimum preset distance value constituting the distance range, the target distance range is the distance range; for the maximum preset distance value constituting the distance range, the target distance range is any distance range in the distance ranges, in which the maximum preset distance value is the minimum distance value.
4. The method of claim 1, wherein the selecting, from the set of resource values for the target satellite, the resource value configured for the terminal in the terrestrial coverage area of the target satellite comprises:
and under the condition that a plurality of satellite cells exist in the target satellite, according to the principle that the larger the distance between a coverage area formed by any one satellite cell on the ground and the target satellite is, the larger the resource value configured for the terminal in the coverage area of the satellite cell on the ground is, the resource value configured for the terminal in the coverage area of each satellite cell is from the resource value set of the target satellite.
5. The method according to any one of claims 1 to 4, wherein the predetermined distance ranges do not overlap with each other.
6. The method of claim 5, wherein determining the distance between the target satellite and the gateway based on the position of the target satellite comprises:
and determining the distance between the target satellite and the gateway according to the position of the target satellite every preset time.
7. The method of claim 6, wherein after selecting the resource value configured for the terminal in the terrestrial coverage area of the target satellite from the set of resource values of the target satellite, further comprising:
and respectively sending corresponding resource values to terminals in the ground coverage area of each satellite cell of the target satellite.
8. The method of claim 7, wherein the corresponding resource value is transmitted to the terminal in the area covered by the ground by any satellite cell of the target satellite by means of broadcast or RRC message.
9. A resource allocation apparatus, comprising:
the first determining module is used for determining the distance between the target satellite and the gateway according to the position of the target satellite; the target satellite is any satellite which establishes a communication link with the gateway station;
a second determining module, configured to use the resource value set corresponding to the distance range to which the distance belongs as the resource value set of the target satellite according to a preset correspondence between the distance range and the resource value set; when the distance between the target satellite and the gateway belongs to the distance range, the minimum resource value in the resource value set corresponding to the distance range ensures the demodulation performance required by the terminal in the coverage area of the target satellite; in at least part of the distance ranges in the distance range, the smaller the minimum distance value in the distance range is, the smaller the minimum resource value in the resource value set corresponding to the distance range is;
and the selecting module is used for selecting a resource value configured for the terminal in the ground coverage area of the target satellite from the resource value set of the target satellite.
10. A readable storage medium, comprising: the storage medium includes a stored program, wherein the program executes the resource allocation method according to any one of claims 1 to 8.
11. A satellite communication system, comprising: satellites, gateway stations and terminals;
the terminal and the gateway station communicate through the satellite relay;
the gateway station applying the method of any one of claims 1 to 8.
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