CN113660642B - Vacuum tube high-speed aircraft ground wireless communication physical resource multiplexing method - Google Patents

Vacuum tube high-speed aircraft ground wireless communication physical resource multiplexing method Download PDF

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CN113660642B
CN113660642B CN202110834231.2A CN202110834231A CN113660642B CN 113660642 B CN113660642 B CN 113660642B CN 202110834231 A CN202110834231 A CN 202110834231A CN 113660642 B CN113660642 B CN 113660642B
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urllc
urllc service
service
grade
resource block
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CN113660642A (en
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张嘉驰
刘留
王凯
韩柏涛
李铮
艾渤
李璐
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Beijing Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • 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

Abstract

The embodiment of the invention provides a vacuum tube high-speed aircraft train-ground wireless communication physical resource multiplexing method, which comprises the steps of dividing different low-delay high-reliability communication services into a plurality of grades according to error rate and delay indexes, mapping the grades to resource blocks with different sizes, determining the multiplexing range of the services based on different allowable delays of the services of each grade, constructing an optimization problem with minimum uRLLC service total power as a target on the basis of ensuring the uRLLC service bit error rate and delay requirements, and providing a greedy strategy to rapidly solve the optimization problem. The invention can overcome the deep fading of the channel to a certain extent, make up the defect of power saving under the condition that the existing communication physical resource multiplexing theory does not consider the coexistence of various uRLLC services, and improve the reliability of the communication system.

Description

Vacuum tube high-speed aerocar ground wireless communication physical resource multiplexing method
Technical Field
The invention relates to the technical field of communication, in particular to a vacuum tube high-speed aerocar ground wireless communication physical resource multiplexing method.
Background
In recent decades, the achievement of high-speed railways in China attracts the attention of the world, and meanwhile, the next generation of ultrahigh-speed high-speed rail-vacuum tube high-speed flying train (flying train for short) known as a fifth vehicle enters the visual field of people, the vacuum tube high-speed flying train adopts a magnetic suspension train technology, and air is pumped out in a closed metal pipeline to realize a low-air-pressure environment close to vacuum, so that the ultrahigh-speed running of the train in a wheel-rail resistance-free, low-air-resistance and low-noise mode all day long is realized. When the train runs in the pipeline close to vacuum, the theoretical speed per hour is 1000-4000 km/h.
The flight train needs various safety communication services to guarantee train-ground wireless communication, train safety service information such as real-time operation control of operation, safety monitoring, maintenance and the like of the flight train needs to be transmitted to the ground so as to meet real-time dynamic tracking of a ground control center on the flight train and real-time interactive transmission of information, the service data volume of the part is small, but the requirements on transmission delay and bit error rate are very strict, the service can be regarded as ultra-Reliable Low Latency communication (uRLLC) service, non-safety services such as Mobile multimedia and the like mainly comprising passengers have large requirements on bandwidth, the requirements on transmission delay and bit error rate are Low, and the service can be regarded as Enhanced Mobile bandwidth (Enhanced Mobile Broadband, eMB) service.
When two heterogeneous services coexist, the communication requirements of high throughput and high reliability can be simultaneously ensured in a time-frequency domain resource multiplexing mode. However, the existing resource multiplexing theory and method only treat two services differently by dividing the two services into two, and directly multiplex the resources in the next mini-slot reaching the urrllc service, and the influence of different time delays of various types of urrllc services on resource multiplexing is not further studied. In addition, there is no relevant literature on how to achieve fast reuse of resources and minimize the power consumed, and thus, the problem needs to be solved.
Disclosure of Invention
The embodiment of the invention provides a vacuum tube high-speed aircraft train-ground wireless communication physical resource multiplexing method, which is used for solving the problems that the existing physical resource multiplexing method is used for multiplexing all uRLLC services in the next mini-slot, the deep fading of a channel cannot be overcome, and the power consumption of the existing method is overlarge.
In order to achieve the purpose, the invention adopts the following technical scheme.
A vacuum tube high-speed aerotrain ground wireless communication physical resource multiplexing method, the physical resource is time frequency domain resource, including the following steps:
the method comprises the following steps of S1, dividing different low-delay and high-reliability communication uRLLC services into a plurality of grades according to error rate and delay indexes, and mapping the uRLLC services to resource blocks with different sizes, wherein the plurality of uRLLC services have the same grade; determining the allowable time delay range and the bit error rate BER index of the uRLLC service of each grade from a high grade to a low grade, and determining a target function for minimizing the total power of the uRLLC service on the basis of ensuring the bit error rate and the time delay requirement of the uRLLC service;
s2, preferentially processing the high-grade uRLLC service, selecting a resource block in the high-grade uRLLC service, searching the optimal multiplexing position of the high-grade uRLLC service in a mode of traversing all possible time-frequency domain resource positions according to a target function and the time delay range of the high-grade uRLLC service, calculating the total power correspondingly distributed by the resource block, and further calculating the power distributed at each position in the resource block;
s3, forbidding the position in the neighborhood of the processed uRLLC service resource block, and repeating the step S2 for other uRLLC service resource blocks of the same grade until all the uRLLC service resource blocks of the same grade are processed; and (4) carrying out the operations of the steps S2-S3 on the uRLLC services of other grades successively according to the sequence of grades from high to low until all the uRLLC services are processed.
Preferably, the minimum unit of the physical resource is called mini-RE, each mini-RE occupies the time duration Δ t, and occupies the bandwidth Δ f.
Preferably, the dividing, according to the bit error rate and the delay index, different low-delay high-reliability communication uRLLC services into several grades and mapping the uRLLC services to resource blocks of different sizes, where the several uRLLC services have the same grade, includes:
dividing the service into a plurality of different grades according to the time delay, the bit error rate and the maximum allowable time delay of different uRLLC servicesThe total number of levels is marked as S, wherein the number of uRLLC services with the level of S is
Figure BDA0003173206110000031
The maximum allowed scheduling delay of the resource block mapped by the uRLLC service with the grade of s is marked as d s I.e. d s And representing the number of mini-REs occupied by the resource blocks mapped by the uRLLC service with the grade of s in the time domain, wherein the value is a positive integer.
Preferably, the determining the allowable delay range and the bit error rate BER indicator of the urrllc service of each level includes:
the BER index corresponding to the uRLLC service with the grade of s is
Figure BDA0003173206110000032
The duration corresponding to the mapping of the uRLLC service with the grade of s to the resource block is recorded as
Figure BDA0003173206110000033
Bandwidth is noted as
Figure BDA0003173206110000034
Wherein
Figure BDA0003173206110000035
And
Figure BDA0003173206110000036
respectively representing the number of mini-RE occupied by uRLLC service with the grade of s mapped to the resource block in the time domain and the frequency domain, and taking the value as a positive integer;
the uRLLC service multiplexes time-frequency resources of common user service by means of preemption, and the initial time-frequency domain coordinate of the qth uRLLC service resource block is marked as
Figure BDA0003173206110000037
Figure BDA0003173206110000038
And
Figure BDA0003173206110000039
the starting coordinates of the qth uRLLC service resource block on the time domain and the frequency domain are represented, and the time-frequency domain resource range occupied by the qth uRLLC service resource block is recorded as
Figure BDA00031732061100000310
The range is a rectangular area;
the q uRLLC service grade is s, the corresponding signal to interference plus noise ratio SINR of the q uRLLC service resource block is expressed as
Figure BDA0003173206110000041
In the formula (1), the reaction mixture is,
Figure BDA0003173206110000042
represents the signal-to-interference-and-noise ratio of the resource block of the qth uRLLC service,
Figure BDA0003173206110000043
the coordinate in the time-frequency domain resource range of the representation q uRLLC service is (t) q ,f q ) The channel gain on the mini-RE of (c),
Figure BDA0003173206110000044
and
Figure BDA0003173206110000045
respectively represents the time-frequency domain resource range of the qth uRLLC service, and the coordinate is (t) q ,f q ) The power of uRLLC service and eMBS service distributed on the mini-RE, N s,0 Represents the noise power in the time-frequency domain resource range of the qth uRLLC service, and has the value of
Figure BDA0003173206110000046
Wherein n is 0 Representing a noise power spectral density;
the uRLLC service is modulated by adopting M-QAM, and the BER under the additive white Gaussian noise can be expressed as
Figure BDA0003173206110000047
Where M represents the order of modulation, erfc (-) is a complementary error function,
Figure BDA0003173206110000048
and representing the calculated BER in the q-th uRLLC service resource block.
Preferably, the objective function for minimizing the total power of the uRLLC service is determined on the basis of guaranteeing the bit error rate and the delay requirement of the uRLLC service, and the following specific steps are performed:
Figure BDA0003173206110000049
the constraint conditions are as follows:
Figure BDA00031732061100000410
Figure BDA00031732061100000411
Figure BDA00031732061100000412
Figure BDA0003173206110000051
Figure BDA0003173206110000052
wherein, the q-th uRLLC service grade is s,
Figure BDA0003173206110000053
is shown to the qthThe total power distributed by the resource blocks of the uRLLC services, the constraint condition (5) indicates that the multiplexing positions of any two uRLLC service resource blocks are not coincident,
Figure BDA0003173206110000054
the resource range of the time-frequency domain occupied by the q' th uRLLC service resource block is shown, the formula (6) shows the time-domain allowable range of the resource block occupying position of the q-th uRLLC service, t arr The mini-RE time of the uRLLC service arrival is represented as an integer, the formula (7) represents that the resource block of the qth uRLLC service cannot exceed the maximum bandwidth of the system in the frequency domain, and N f And (3) the total number of mini-REs occupied by the frequency domain resources is represented, the value is an integer, and the equation (8) represents that the BER can meet the BER requirement of the grade service only when the SINR reaches a preset value.
Preferably, the S2 includes:
and calculating the total power of the uRLLC distributed by the resource block according to the following formula:
Figure BDA0003173206110000055
the eMBB power is obtained according to a water injection power algorithm and is applied to the resource block
Figure BDA0003173206110000056
And power at different mini-RE positions is distributed according to the following formula:
Figure BDA0003173206110000057
in that
Figure BDA0003173206110000058
Search in a traversal range to find
Figure BDA0003173206110000059
Minimum optimum position
Figure BDA00031732061100000510
Wherein
Figure BDA00031732061100000511
And
Figure BDA00031732061100000512
respectively representing the time domain and frequency domain coordinates of the optimal position, and further determining the multiplexing range
Figure BDA00031732061100000513
The allocated power is solved according to equation (9)
Figure BDA00031732061100000514
Determined according to equation (10)
Figure BDA00031732061100000515
Allocated power per mini-RE.
Preferably, the disabling the position in the neighborhood of the processed uRLLC service resource block includes:
the inside and peripheral range of the resource block of the q-th uRLLC service
Figure BDA0003173206110000061
The inside is set as a non-multiplexing range, and the q-th uRLLC service grade is s, t and f respectively represent coordinate values of a time-frequency domain.
As can be seen from the technical solutions provided by the embodiments of the present invention, the embodiments of the present invention provide a vacuum tube high-speed aerotrain-ground wireless communication physical resource multiplexing method, including: dividing different uRLLC services into a plurality of grades according to the error rate and the time delay index, and mapping the grades to resource blocks with different sizes; appointing the multiplexing time delay margin of each grade service, and constructing an optimization problem which aims at minimizing the total power of the uRLLC service on the basis of ensuring the bit error rate and the time delay requirement of the uRLLC service; according to an objective function, firstly finding out the optimal multiplexing position of the high-grade uRLLC service in a mode of traversing all possible resource positions, calculating the total power correspondingly allocated to the resource block, and further calculating the power allocated to each position in the resource block; and disabling the resource position in the neighborhood of the processed uRLLC service resource block, reusing the resources in the area by other resource blocks, repeating the operation on all other services at the same level, and sequentially performing similar processing on other services at lower levels according to the sequence from high level to low level. According to the method, on one hand, the uRLLC service time delay allowance of each grade is taken into consideration, on the other hand, the purpose of energy saving is achieved by considering power minimization, the defects of the existing resource multiplexing theory are made up, and the reliability of the vehicle-ground communication system is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a vacuum tube high-speed aircraft train-ground wireless communication physical resource reuse method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The embodiment of the invention provides a vacuum tube high-speed aircraft train-ground wireless communication physical resource multiplexing method, mainly researching a train-ground wireless communication physical resource multiplexing method with dynamic time delay allowance, as shown in figure 1, comprising the following steps:
s1, inputting vacuum tube high-speed flight train-vehicle-ground wireless channel gain and a plurality of uRLLC services, dividing different uRLLC services into a plurality of grades according to error rate and time delay indexes, wherein each grade has a plurality of uRLLC services, and distributing the uRLLC services of different grades to physical resource blocks with different sizes; and specifying the multiplexing time delay margin of each grade service, multiplexing each uRLLC service within the allowed time delay margin when multiplexing the uRLLC service, and constructing an optimization problem aiming at minimizing the total power of the uRLLC service on the basis of ensuring the bit error rate and the time delay requirement of the uRLLC service. The method specifically comprises the following steps:
the physical resource is a time-frequency domain physical resource, wherein the minimum unit of the physical resource is called mini-RE, the occupied time length of each mini-RE is delta t, and the occupied bandwidth is delta f. The urrllc service has a random sporadic characteristic, and when multiplexing the reached urrllc resource, the resource block allocated to the urrllc service is directly superimposed on the communication physical resource allocated to the Enhanced Mobile Broadband (eMBB) service of the common user.
Dividing the service into a plurality of different grades according to indexes such as time delay, bit Error Rate (BER), maximum allowable time delay and the like of different uRLLC services, wherein the total number of the grades is marked as S, a plurality of uRLLC services have the same grade, and the number of the uRLLC services marked as S is marked as S
Figure BDA0003173206110000081
The resource block mapped by the uRLLC service with the grade of s has certain maximum allowable scheduling delay, which is marked as d s Wherein d is s The number of mini-RE occupied in the time domain is represented, and the value is a positive integer. The BER index corresponding to the uRLLC service with the grade of s is
Figure BDA0003173206110000082
The duration corresponding to the mapping of the uRLLC service with the grade of s to the resource block is recorded as
Figure BDA0003173206110000083
Bandwidth is recorded as
Figure BDA0003173206110000084
Wherein
Figure BDA0003173206110000085
And
Figure BDA0003173206110000086
respectively representing the number of mini-RE occupied in the time domain and the frequency domain, and taking the value as a positive integer. The uRLLC service multiplexes time-frequency resources of common user service in a preemption mode, and the starting time-frequency domain coordinate of the qth uRLLC service resource blockIs marked as
Figure BDA0003173206110000087
Figure BDA0003173206110000088
And
Figure BDA0003173206110000089
representing the starting coordinates of the qth uRLLC service on the time domain and the frequency domain, and recording the time-frequency domain resource range occupied by the qth uRLLC service resource block as
Figure BDA00031732061100000810
The range is a rectangular area.
The q-th uRLLC service class is s, and the corresponding Signal to Interference plus Noise Ratio (SINR) of the q-th uRLLC service resource block is expressed as
Figure BDA0003173206110000091
In the formula (1), the reaction mixture is,
Figure BDA0003173206110000092
represents the signal-to-interference-and-noise ratio of the qth uRLLC service (class s) resource block,
Figure BDA0003173206110000093
the coordinate in the time-frequency domain resource range of the representation q uRLLC service is (t) q ,f q ) The channel gain on the mini-RE of (c),
Figure BDA0003173206110000094
and
Figure BDA0003173206110000095
respectively represents the time-frequency domain resource range of the qth uRLLC service, and the coordinate is (t) q ,f q ) The uRLLC service power distributed on the mini-RE and the eMBB service power, N, of the common user service s,0 Time-frequency of q-th uRLLC service (with grade of s)Noise power in the domain resource range of value
Figure BDA0003173206110000096
Wherein n is 0 Representing the noise power spectral density.
Modulating the uRLLC service by using M-QAM (Multiple Quadrature Amplitude Modulation), wherein the BER under the additive white Gaussian noise can be expressed as
Figure BDA0003173206110000097
Where M represents the order of modulation, erfc (-) is a complementary error function,
Figure BDA0003173206110000098
and the calculated BER in the q-th uRLLC service (with the grade of s) resource block is shown.
Constructing an optimization problem for minimizing the total power of the uRLLC service, which comprises the following specific steps:
Figure BDA0003173206110000099
the constraint conditions are as follows:
Figure BDA00031732061100000910
Figure BDA00031732061100000911
Figure BDA0003173206110000101
Figure BDA0003173206110000102
Figure BDA0003173206110000103
wherein the content of the first and second substances,
Figure BDA0003173206110000104
the total power allocated to the resource block of the qth uRLLC service (with the grade of s) is calculated by equation (4). Constraint (5) indicates that the multiplexing positions of any two uRLLC service resource blocks do not coincide,
Figure BDA0003173206110000105
the resource range of the time-frequency domain occupied by the q' th uRLLC service resource block is shown, the formula (6) shows the time-domain allowable range of the resource block occupying position of the q-th uRLLC service, t arr The mini-RE time of the uRLLC service arrival is represented as an integer, the formula (7) represents that the resource block of the qth uRLLC service cannot exceed the maximum bandwidth of the system in the frequency domain, and N f The total number of mini-REs occupied by the frequency domain resources is represented, the value is an integer, and the equation (8) represents that the SINR must reach a certain value to meet the BER requirement of the grade service.
S2, according to the constructed optimization objective function, namely a formula (3), the optimal multiplexing position of the high-grade uRLLC service is firstly found out in a mode of traversing all physical resource positions from the arrival time of the uRLLC service to the allowed maximum time delay range, the total power correspondingly distributed to the resource block is calculated according to a formula (9), and then the power distributed to each position in the resource block is calculated according to a formula (10). The method comprises the following specific steps:
the uRLLC of the high-level service is processed firstly. Selecting a resource block in the high-grade uRLLC service, firstly determining the total power of the uRLLC allocated to the resource block, and calculating according to the following formula:
Figure BDA0003173206110000106
the eMBB power is obtained according to a water injection power algorithm. For resource blocks
Figure BDA0003173206110000107
And power at different mini-RE positions is distributed according to the following formula:
Figure BDA0003173206110000111
in that
Figure BDA0003173206110000112
Search through the range to find
Figure BDA0003173206110000113
Minimum optimum position
Figure BDA0003173206110000114
Wherein
Figure BDA0003173206110000115
And
Figure BDA0003173206110000116
respectively representing the time domain and frequency domain coordinates of the optimal position, and further determining the multiplexing range
Figure BDA0003173206110000117
The allocated power is solved according to equation (9)
Figure BDA0003173206110000118
Determined according to equation (10)
Figure BDA0003173206110000119
Allocated power per mini-RE.
S3, forbidding the resource position in the neighborhood of the processed uRLLC service resource block, enabling other uRLLC service resource blocks not to reuse physical resources in the area, and repeating the operation of the S2 on all other uRLLC services of the grade until all the uRLLC services of the grade are processed; and then, according to the sequence of the grades from high to low, carrying out similar processing on the uRLLC services of other grades successively according to the S2-S3 method until all the uRLLC services are processed. The method comprises the following specific steps:
the inner and peripheral range of the q-th uRLLC service (with the grade of s) resource block
Figure BDA00031732061100001110
Setting the range as non-multiplexing range, t and f respectively representing the coordinate values of time-frequency domain, and continuing to perform the same resource multiplexing operation on the grade of service until the grade of service is completely processed. And successively carrying out the same multiplexing operation on the services of other grades according to the method until all the uRLLC services are processed.
In summary, the embodiments of the present invention provide a vacuum tube high-speed train-ground wireless communication physical resource multiplexing method, wherein different low-delay and high-reliability communication services are divided into several levels according to bit error rate and delay indexes and mapped to resource blocks of different sizes, a multiplexing range of the communication services is determined based on different allowed delays of the services of each level, an optimization problem targeting minimization of total power of the urrllc service is constructed on the basis of ensuring bit error rate and delay requirements of the urrllc service, and a greedy strategy is provided for rapidly solving the optimization problem, specifically, a multiplexing position of the urrllc service and power in the resource blocks are determined successively from high level to low level. The invention can overcome the deep fading of the channel to a certain extent, make up the defect of power saving under the condition that the existing communication physical resource multiplexing theory does not consider the coexistence of various uRLLC services, and improve the reliability of the communication system.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (7)

1. A vacuum tube high-speed aerotrain ground wireless communication physical resource multiplexing method is disclosed, the physical resource is a time-frequency domain resource, and the method is characterized by comprising the following steps:
the method comprises the following steps of S1, dividing different low-delay and high-reliability communication uRLLC services into a plurality of grades according to error rate and delay indexes, and mapping the uRLLC services to resource blocks with different sizes, wherein the plurality of uRLLC services have the same grade; determining the allowable time delay range and the bit error rate BER index of the uRLLC service of each grade from high grade to low grade, and determining an objective function for minimizing the total power of the uRLLC service on the basis of ensuring the bit error rate and the time delay requirement of the uRLLC service;
s2, preferentially processing the high-grade uRLLC service, selecting a resource block in the high-grade uRLLC service, searching the optimal multiplexing position of the high-grade uRLLC service in a mode of traversing all possible time-frequency domain resource positions according to a target function and the time delay range of the high-grade uRLLC service, calculating the total power correspondingly distributed by the resource block, and further calculating the power distributed at each position in the resource block;
s3, forbidding the position in the neighborhood of the processed uRLLC service resource block, and repeating the step S2 for other uRLLC service resource blocks of the same grade until all the uRLLC service resource blocks of the same grade are processed; and (4) carrying out the operations of the steps S2-S3 on the uRLLC services of other levels successively according to the sequence of the levels from high to low until all the uRLLC services are processed.
2. The method of claim 1, wherein the minimum unit of the physical resource is called mini-RE, each mini-RE occupies time Δ t and occupies bandwidth Δ f.
3. The method of claim 2, wherein the dividing different low-delay high-reliability communication uRLLC services into several grades according to the bit error rate and the delay index and mapping the uRLLC services to resource blocks of different sizes, wherein several uRLLC services have the same grade comprises:
dividing the service into a plurality of different grades according to the time delay, the bit error rate and the maximum allowable time delay of different uRLLC services, wherein the total number of the grades is marked as S, wherein the number of the uRLLC services with the grade of S is
Figure FDA0003173206100000011
To which class s uRLLC traffic is mappedThe maximum allowed scheduling delay of the resource block, denoted as d s I.e. d s And the resource block mapped by the uRLLC service with the grade of s occupies the number of mini-RE in the time domain, and the value is a positive integer.
4. The method of claim 3, wherein the determining the allowable delay range and the bit error rate BER index of the uRLLC service of each class comprises:
the BER index corresponding to the uRLLC service with the grade of s is P s req The duration of mapping the uRLLC service with the grade s to the resource block is recorded as
Figure FDA0003173206100000021
Bandwidth is recorded as
Figure FDA0003173206100000022
Wherein
Figure FDA0003173206100000023
And
Figure FDA0003173206100000024
respectively representing the number of mini-RE occupied by uRLLC service with the grade of s mapped to the resource block in the time domain and the frequency domain, and taking the value as a positive integer;
the uRLLC service multiplexes time-frequency resources of common user service by means of preemption, and the initial time-frequency domain coordinate of the qth uRLLC service resource block is marked as
Figure FDA0003173206100000025
Figure FDA0003173206100000026
And
Figure FDA0003173206100000027
the starting coordinates of the qth uRLLC service resource block on the time domain and the frequency domain are shown, and the time-frequency domain resource occupied by the qth uRLLC service resource blockRange is marked as
Figure FDA0003173206100000028
The range is a rectangular area;
the q uRLLC service grade is s, the corresponding signal to interference plus noise ratio SINR of the q uRLLC service resource block is expressed as
Figure FDA0003173206100000029
In the formula (1), the acid-base catalyst,
Figure FDA00031732061000000210
represents the signal-to-interference-and-noise ratio of the resource block of the qth uRLLC service,
Figure FDA00031732061000000211
the coordinate in the time-frequency domain resource range of the representation q uRLLC service is (t) q ,f q ) The channel gain on the mini-RE of (c),
Figure FDA00031732061000000212
and
Figure FDA00031732061000000213
respectively represents the time-frequency domain resource range of the qth uRLLC service, and the coordinate is (t) q ,f q ) The power of uRLLC service and eMBS service distributed on the mini-RE, N s,0 Represents the noise power in the time-frequency domain resource range of the qth uRLLC service, and has the value of
Figure FDA00031732061000000214
Wherein n is 0 Representing a noise power spectral density;
the uRLLC service is modulated by adopting M-QAM, and the BER under the additive white Gaussian noise can be expressed as
Figure FDA0003173206100000031
Where M represents the order of modulation, erfc (-) is a complementary error function,
Figure FDA0003173206100000032
and representing the calculated BER in the qth uRLLC service resource block.
5. The method according to claim 4, wherein the objective function for minimizing the total power of the urlllc service is determined on the basis of guaranteeing the bit error rate and the delay requirement of the urlllc service, and specifically the following is determined:
Figure FDA0003173206100000033
the constraint conditions are as follows:
Figure FDA0003173206100000034
Figure FDA0003173206100000035
Figure FDA0003173206100000036
Figure FDA0003173206100000037
Figure FDA0003173206100000038
wherein, the q-th uRLLC service grade is s,
Figure FDA0003173206100000039
the total power allocated to the resource block of the qth uRLLC service is shown, the constraint condition (5) shows that the multiplexing positions of any two uRLLC service resource blocks are not coincident,
Figure FDA00031732061000000310
the time-frequency domain resource range occupied by the q 'th uRLLC service resource block is shown, the formula (6) shows the time domain allowable range of the occupying position of the q' th uRLLC service resource block, t arr The mini-RE time of the uRLLC service arrival is represented and is an integer, the formula (7) represents that the resource block of the q-th uRLLC service cannot exceed the maximum bandwidth of the system in the frequency domain, and N f And (3) the total number of mini-REs occupied by the frequency domain resources is represented, the value is an integer, and the equation (8) represents that the BER can meet the BER requirement of the grade service only when the SINR reaches a preset value.
6. The method of claim 5, wherein the S2 comprises:
calculating the total power of uRLLC allocated to the resource block according to the following formula:
Figure FDA0003173206100000041
the eMBB power is obtained according to a water injection power algorithm and is applied to the resource block
Figure FDA0003173206100000042
And the power at different mini-RE positions is distributed according to the following formula:
Figure FDA0003173206100000043
in that
Figure FDA0003173206100000044
Performing traversal search within rangeFind out that
Figure FDA0003173206100000045
Minimum optimum position
Figure FDA0003173206100000046
Wherein
Figure FDA0003173206100000047
And
Figure FDA0003173206100000048
respectively representing the time domain and frequency domain coordinates of the optimal position, thereby determining the multiplexing range
Figure FDA0003173206100000049
The allocated power is solved according to equation (9)
Figure FDA00031732061000000410
Determined according to equation (10)
Figure FDA00031732061000000411
Allocated power per mini-RE.
7. The method of claim 6, wherein the disabling the position in the neighborhood of the processed uRLLC service resource block comprises:
the inside and peripheral range of the resource block of the q-th uRLLC service
Figure FDA00031732061000000412
The inside is set as a non-multiplexing range, and the q-th uRLLC service grade is s, t and f respectively represent coordinate values of a time-frequency domain.
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