CN110620807B - File transmission method, server, system, device and storage medium - Google Patents
File transmission method, server, system, device and storage medium Download PDFInfo
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- CN110620807B CN110620807B CN201910396727.9A CN201910396727A CN110620807B CN 110620807 B CN110620807 B CN 110620807B CN 201910396727 A CN201910396727 A CN 201910396727A CN 110620807 B CN110620807 B CN 110620807B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
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- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
Abstract
The invention provides a file transmission method, a server, a system, equipment and a storage medium, wherein the method comprises the following steps: the management server acquires a transmission request sent by the first access point and storage information sent by the storage server, wherein the transmission request comprises: first file information, a request bit rate, location information of a first access point, and channel resource information; the management server determines actual transmission information meeting a preset transmission model according to the transmission request and the storage information, so that the storage server determines a file acquisition mode according to the actual transmission information, and transmits the first file to the user through the second access point by using actual channel resources, actual transmission power and actual bit rate after acquiring the first file according to the file acquisition mode. The method provided by the invention realizes the file transmission with the maximum bit rate under the condition of meeting the non-orthogonal transmission technology, and improves the file transmission efficiency.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a file transmission method, a server, a system, a device, and a storage medium.
Background
In the field of multimedia file transmission, the multimedia service types are presented in a diversified manner, and the hardware processing capabilities of user equipment are different from each other, so that the requirements for bit rate and time delay are presented differently when a user requests a multimedia file.
In the existing multimedia file transmission process, an orthogonal access technology is usually adopted, that is, a server transmits a file at a certain bit rate by using one transmission channel. In order to respond to the number of the rapidly increased users and respond to the file transmission requests of the differences of the users, the server inevitably occupies more frequency spectrum resources when transmitting files to the users.
However, due to limited spectrum resources, the bit rate of the file transmitted by the existing orthogonal access technology is low, and the user request cannot be responded quickly.
Disclosure of Invention
The invention provides a file transmission method, a server, a system, equipment and a storage medium, which aim to solve the technical problems that the bit rate of a file transmitted by adopting an orthogonal access technology in the existing file transmission method is low and a user request cannot be quickly responded due to limited frequency spectrum resources.
In a first aspect, the present invention provides a file transmission method, based on a transmission system, where the transmission system includes a management server, at least one storage server, and at least one access point, and the method includes:
the management server acquires a transmission request sent by the first access point and storage information sent by the storage server, wherein the transmission request comprises: first file information, a request bit rate, location information of a first access point, and channel resource information;
the management server determines actual transmission information meeting a preset transmission model according to the transmission request and the storage information, so that the storage server determines a file acquisition mode according to the actual transmission information, acquires the first file according to the file acquisition mode, and transmits the first file to the user through the second access point by using actual channel resources, actual transmission power and actual bit rate;
wherein, actually transmitting the information comprises: a second access point, actual channel resources, actual transmission power, and actual bit rate; the first access point is used for transmitting the request, the second access point is used for transmitting the first file, the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all the second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relation between the stored information and the second access point.
In the file transmission method provided by the invention, the management server determines actual transmission information meeting a preset transmission model according to a transmission request and storage information, wherein the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, a first constraint in the constraint set is used for constraining all second access points which transmit a first file to the same user to transmit by adopting the same actual channel resource, so that the transmission is realized at the maximum bit rate under the condition of meeting a non-orthogonal transmission technology, and the file transmission efficiency is improved.
Optionally, the transmitting the request further comprises: channel quality information; the set of constraints further includes: a third constraint, a fourth constraint, a fifth constraint, and a sixth constraint;
the third constraint is used for constraining the relation among the second access point, the actual channel resource, the actual transmission power and the channel quality information;
the fourth constraint is used for constraining the relation between the second access point and the actual channel resource;
a fifth constraint for constraining the relationship between the actual bit rate and the requested bit rate;
a sixth constraint is used to constrain the actual transmission power to be less than the maximum transmission power.
Optionally, the objective function is specifically:
wherein, Bc,fIndicating that user c requests the transmission of the f-th file
C is more than or equal to 1 and less than or equal to C, F is more than or equal to 1 and less than or equal to F, C represents the total number of users, F represents the total number of files, L is a file set stored by a storage server, and L is a great mouthL1,L2,...,LN}；
The first constraint is specifically:
the second constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point s occupies the channel k or not to send the f-th file to the user c
Indicating whether the access point i occupies the channel l to send the tth file v to the user cs,cIndicating whether the access point s can serve the user c,
indicating whether a storage server connected to the access point s has cached the file
S is a set of access points in the network, C represents a set of users, K represents a set of available channels, S ═ 1, 2., S }, C ═ 1, 2., C }, K ═ 1, 2., K }, 1 ≦ S, i ≦ S, 1 ≦ F, t ≦ F, 1 ≦ K, and l ≦ K.
Alternatively,
the third constraint is specifically:
the fourth constraint is specifically:
the fifth constraint is specifically:
the sixth constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point i occupies the channel k to send the tth file to the user j,
indicating the channel quality of the link between access point s and user c on channel k,
indicating the channel quality of the link between access point i and user c on channel k,
indicating that access point s sends an f-th file to user c on channel k
The power of (a) is determined,
representing the power, P, at which the access point i transmits the tth file to the user c on channel kmaxFor maximum transmission power of access point, Rc,fIndicating that user c receives the f-th file
The actual data rate of the data stream being,
representing transmission files
W denotes the channel bandwidth, σ2Represents the average power of Gaussian white noise, B represents the file bit rate set, and B ═ B1,B2,...,BM}。
In a second aspect, the present invention provides a file transmission method, based on a transmission system, where the transmission system includes a management server, at least one storage server, and at least one access point, and the method includes:
the storage server acquires a second access point used for transmitting the first file from the actual transmission information; the actual transmission information is determined by the management server according to the transmission request, the storage information and the preset transmission model, and the actual transmission information comprises: the second access point, actual channel resources used for transmitting the first file, actual transmission power and actual bit rate; the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relationship between the stored information and the second access points;
and the storage server determines a file acquisition mode according to the storage information, and transmits the first file to the user by using the actual channel resource, the actual transmission power and the actual bit rate through the second access point after acquiring the first file according to the file acquisition mode.
In the file transmission method provided by the invention, the management server determines actual transmission information according to a preset transmission model, a transmission request and storage information, the storage server acquires a second access point used for transmitting a first file from the actual transmission information, determines a file acquisition mode according to the storage information, and transmits the first file to a user through the second access point by using actual channel resources, actual transmission power and actual bit rate after acquiring the first file according to the file acquisition mode, so that the transmission is carried out at the maximum bit rate under the condition of meeting a non-orthogonal transmission technology, and the file transmission efficiency is improved.
Optionally, the determining, by the storage server, a file acquisition manner according to the storage information specifically includes:
if the first file is judged to be stored in the storage server according to the storage information, the first file is obtained from the storage server; or
If the storage server does not store the first file according to the storage information, the storage server acquires the file through the content server; the content server is a server storing a first file.
In the file transmission method provided by the invention, if the storage server stores the file, the file is directly acquired from the storage server, and if the storage server does not store the file, the storage server acquires the file through the content server to realize file transmission.
In a third aspect, the present invention provides a management server comprising:
a first obtaining module, configured to obtain a transmission request sent by a first access point and storage information sent by a storage server, where the transmission request includes: first file information, a request bit rate, location information of a first access point, and channel resource information;
the first determining module is used for determining actual transmission information meeting a preset transmission model according to the transmission request and the storage information, so that the storage server determines a file acquisition mode according to the actual transmission information, and transmits the first file to a user through a second access point by using actual channel resources, actual transmission power and actual bit rate after acquiring the first file according to the file acquisition mode;
wherein, actually transmitting the information comprises: a second access point, actual channel resources, actual transmission power, and actual bit rate; the first access point is used for transmitting the request, the second access point is used for transmitting the first file, the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all the second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relation between the stored information and the second access point.
Optionally, the transmitting the request further comprises: channel quality information; the set of constraints further includes: a third constraint, a fourth constraint, a fifth constraint, and a sixth constraint;
the third constraint is used for constraining the relation among the second access point, the actual channel resource, the actual transmission power and the channel quality information;
the fourth constraint is used for constraining the relation between the second access point and the actual channel resource;
a fifth constraint for constraining the relationship between the actual bit rate and the requested bit rate;
a sixth constraint is used to constrain the actual transmission power to be less than the maximum transmission power.
Optionally, the objective function is specifically:
wherein, Bc,fIndicating that user c requests the transmission of the f-th file
C is more than or equal to 1 and less than or equal to C, F is more than or equal to 1 and less than or equal to F, C represents the total number of users, F represents the total number of files, L is a file set stored by a storage server, and L is { L ═ L ≦1,L2,...,LN}；
The first constraint is specifically:
the second constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point s occupies the channel k or not to send the f-th file to the user c
Indicating whether the access point i occupies the channel l to send the tth file v to the user cs,cIndicating whether the access point s can serve the user c,
indicating whether a storage server connected to the access point s has cached the file
S is a set of access points in the network, C represents a set of users, K represents a set of available channels, S ═ 1, 2., S }, C ═ 1, 2., C }, K ═ 1, 2., K }, 1 ≦ S, i ≦ S, 1 ≦ F, t ≦ F, 1 ≦ K, and l ≦ K.
Alternatively,
the third constraint is specifically:
the fourth constraint is specifically:
the fifth constraint is specifically:
the sixth constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point i occupies the channel k to send the tth file to the user j,
indicating the channel quality of the link between access point s and user c on channel k,
indicating the channel quality of the link between access point i and user c on channel k,
indicating that access point s sends an f-th file to user c on channel k
The power of (a) is determined,
representing the power, P, at which the access point i transmits the tth file to the user c on channel kmaxFor maximum transmission power of access point, Rc,fIndicating that user c receives the f-th file
The actual data rate of the data stream being,
representing transmission files
Maximum bit rate of (1), W representsChannel bandwidth, σ2Represents the average power of Gaussian white noise, B represents the file bit rate set, and B ═ B1,B2,...,BM}。
In a fourth aspect, the present invention provides a storage server, comprising:
the second acquisition module is used for acquiring a second access point used for transmitting the first file from the actual transmission information; the actual transmission information is determined by the management server according to the transmission request, the storage information and the preset transmission model, and the actual transmission information comprises: the second access point, actual channel resources used for transmitting the first file, actual transmission power and actual bit rate; the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relationship between the stored information and the second access points;
and the second determining module is used for determining a file acquisition mode according to the storage information, and transmitting the first file to the user through the second access point by using the actual channel resource, the actual transmission power and the actual bit rate after acquiring the first file according to the file acquisition mode.
Optionally, the second determining module is specifically configured to:
if the first file is judged to be stored in the storage server according to the storage information, the first file is obtained from the storage server; or
If the storage server does not store the first file according to the storage information, the storage server acquires the file through the content server; the content server is a server storing a first file.
In a fifth aspect, the present invention provides a file transfer system comprising: the management server according to the third aspect and the alternative and the storage server according to the fourth aspect and the alternative.
In a sixth aspect, the present invention provides an electronic device comprising: at least one processor and memory;
wherein the memory stores computer execution instructions;
the at least one processor executes computer-executable instructions stored by the memory to cause the at least one processor to perform the file transfer method of the first aspect and the alternatives.
The invention provides a file transmission method, a server, a system, equipment and a storage medium, wherein a management server determines actual transmission information meeting a preset transmission model according to a transmission request and storage information, an objective function in the transmission model is used for maximizing an actual bit rate, a first constraint in a constraint set is used for constraining all second access points transmitting a first file to the same user to transmit by adopting the same actual channel resource, so that the file transmission is carried out at the maximum bit rate under the condition of meeting a non-orthogonal transmission technology, and the file transmission efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flowchart illustrating a file transfer method according to an exemplary embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a file transfer system based on which the file transfer method shown in FIG. 1 is based according to the embodiment of the invention;
FIG. 3 is a flowchart illustrating a file transfer method according to another exemplary embodiment of the present invention;
FIG. 4 is a block diagram illustrating a management server according to an exemplary embodiment of the present invention;
FIG. 5 is a block diagram illustrating a storage server according to an exemplary embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a file transmission method, a server, equipment and a storage medium, which aim to solve the technical problems that the bit rate of a file transmitted by adopting an orthogonal access technology in the existing file transmission method is low and a user request cannot be quickly responded due to limited frequency spectrum resources.
Fig. 1 is a flowchart illustrating a file transfer method according to an exemplary embodiment of the present invention. Fig. 2 is a schematic structural diagram of a file transfer system based on the file transfer method shown in the embodiment of fig. 1.
As shown in fig. 2, the file transmission method provided in this embodiment includes, based on the transmission system: access point 202, storage server 203, and management server 204. When the user 201 is in the service range of the access point 202, the access point 202 serves the user 201, the storage server 203 is connected with a plurality of access points 202 through wired links, and the management server 204 is connected with the storage server 203 through wired links.
In the file transfer system, the storage server 203 stores the connection between the storage server 203 and the access point 202, and various versions of files are cached. And the storage server 203 accesses the core network through a wired link to enable access to the content server 205.
As shown in fig. 1, the file transmission method provided in this embodiment includes the following steps:
s101, the user sends a user request to the access point.
More specifically, the user sends a user request in the form of a broadcast, wherein the user request includes first files and a requested bit rate for each of the first files.
And S102, determining the service user.
More specifically, whether the distance between the user and the access point is within the service distance of the access point is judged, if so, the access point is defined as a first access point, the first access point receives a user request sent by the user, first file information in the user request and the request bit rate of each first file are obtained, and if the distance between the user and the access point exceeds the service distance of the access point, the access point stops serving the user and does not receive the user request sent by the user.
S103, the first access point sends a transmission request to the management server.
More specifically, the first access point generates a transmission request after acquiring first file information in the user request and a request bit rate of each file. Wherein the transmission request includes: first file information, a request bit rate, location information of the first access point, and channel resource information.
S104, the storage server sends the storage information to the management server.
More specifically, the storage information is file information stored by the storage server and version information corresponding to the file.
And S105, the management server determines actual transmission information meeting the preset transmission model according to the transmission request and the storage information.
More specifically, the preset transfer model includes an objective function and a set of constraints. The objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relation between the storage information and the second access points.
And the management server takes the transmission request and the storage information as input quantity of a preset transmission model, solves the preset transmission model and obtains actual transmission information. Wherein, actually transmitting the information comprises: a second access point, actual channel resources, actual transmission power, and actual bit rate. The second access point is an access point for transmitting the first file, the actual channel resource is an actual channel resource used when the second access point is used for transmitting the first file, the actual transmission power is an actual transmission power used when the second access point is used for transmitting the first file, and the actual bit rate is an actual bit rate of the first file transmitted by the second access point.
S106, the management server sends actual transmission information.
S107, the storage server determines a file acquisition mode according to the actual transmission information.
More specifically, the storage server determines that the storage server needs to transmit the file according to the actual transmission information, and determines the obtaining mode according to the file information already stored in the storage server and the file to be transmitted.
S108, the storage server obtains the actual bit rate version of the first file according to the file obtaining mode.
More specifically, after obtaining the file obtaining manner, the storage server obtains the actual bit rate version of the first file according to the file obtaining manner.
S109, the storage server sends the first file information.
More specifically, the storage server sends first file information to the second access point, wherein the first file information includes: the actual bit rate version of the first file, the actual channel resources, and the actual transmission power such that the second access point transmits the actual bit rate version of the first file to the user at the actual channel resources and the actual transmission power.
And S110, the second access point sends the actual bit rate version of the first file.
More specifically, after receiving the first file information, the second access point obtains the actual channel resource and the actual transmission power in the first file information, and sends the actual bit rate version of the first file to the user according to the actual channel resource and the actual transmission power.
In the file transmission method provided in this embodiment, the management server determines, according to the transmission request and the storage information, actual transmission information that satisfies a preset transmission model, where the transmission model includes an objective function and a constraint set, the objective function is used to maximize an actual bit rate, and a first constraint in the constraint set is used to constrain all second access points that transmit a first file to a same user to transmit using a same actual channel resource, so that file transmission is performed at a maximum bit rate under a condition that a non-orthogonal transmission technology is satisfied, and file transmission efficiency is improved.
Fig. 3 is a flowchart illustrating a file transfer method according to another exemplary embodiment of the present invention. As shown in fig. 3, the file transmission method provided in this embodiment includes the following steps:
s301, the user sends a user request to the access point.
S302, determining the service user.
S303, the first access point sends a transmission request to the management server.
More specifically, the transmission request includes: first file information, a request bit rate, location information of a first access point, channel resource information, and channel quality information.
The channel quality information refers to channel gain between the access point and the user, and specifically includes shadow fading, small-scale fading, and the like, and the channel resource information is usable channel information.
S304, the storage server sends the storage information to the management server.
More specifically, assuming that the set of files is { L1, L2.., LN }, the relationship of file popularity is: file L1> file L2. > file LN, with M bit rate versions per file. In each storage server, all bit rate versions of the most popular n files are cached and the highest bit rate version of a partially less popular file is cached.
S305, the management server determines actual transmission information meeting the preset transmission model according to the transmission request and the storage information.
More specifically, the preset transfer model includes an objective function and a set of constraints. Wherein the objective function is for maximizing the actual bitrate, and the set of constraints comprises first to sixth constraints.
The first constraint is used for constraining all second access points which transmit the first file to the same user to adopt the same actual channel resource for transmission.
The second constraint is for constraining a relationship between the stored information and the second access point.
The third constraint is used to constrain the relationship between the second access point, the actual channel resources, the actual transmission power and the channel quality information.
A fourth constraint is used to constrain the relationship between the second access point and the actual channel resources.
A fifth constraint is used to constrain the relationship between the actual bit rate and the requested bit rate.
A sixth constraint is used to constrain the actual transmission power to be less than the maximum transmission power.
In this embodiment, the objective function is specifically:
wherein, Bc,fIndicating that user c requests the transmission of the f-th file
C is more than or equal to 1 and less than or equal to C, F is more than or equal to 1 and less than or equal to F, C represents the total number of users, F represents the total number of files, L is a file set stored by a storage server, and L is { L ═ L ≦1,L2,...,LN}; the quantities to be optimized in the objective function are the transmission power P, the actual bit rate B, and the access point and the occupied channel information μ selected by the transmission file.
The first constraint is specifically:
a first constraint means that several access points serving a certain user transmit files using the same channel to achieve non-orthogonal transmission.
The second constraint is specifically:
the first equation in the second constraint represents if all edge servers connected to the access point that can serve user c do not cache files
Selecting a transmission file from all access points capable of serving user c
The second equation in the second constraint indicates if some edge servers connected to the ap serving user c cache files
Selecting a transmission file from all the access points which can serve the user c and are connected with the edge server which caches the file
The third constraint is specifically:
the third constraint is used to ensure the sequence of successive interference cancellation, where the first expression in the third constraint indicates that if users c, j occupy channel k at the same time, for user c, the channel quality of the serving access point is better than that of the non-serving access point (interference is brought by the non-serving access point), and the second expression in the third constraint indicates that for a certain user, the signal with good channel quality is demodulated first.
The fourth constraint is specifically:
the fourth constraint represents the file requested by user c
Only one channel can be used by one access point for transmission.
The fifth constraint is specifically:
a fifth constraint is used to indicate that the actual bit rate of the file is equal to the transmission rate and equal to or less than the requested bit rate.
The sixth constraint is specifically:
the sixth constraint represents a maximum transmit power limit for each access point.
Wherein the content of the first and second substances,
indicating whether the access point s occupies the channel k or not to send the f-th file to the user c
Indicating whether the access point i occupies the channel l to send the tth file v to the user cs,cIndicating whether the access point s can serve the user c,
indicating whether a storage server connected to the access point s has cached the file
S is the access point set in the network, C is the user set, K is the available channel set, S ═ tone1,2,...,S}，C＝{1,2,...,C}，K＝{1,2,...,K}，1≤s≤S，1≤f,t≤F，1≤k,l≤K。
Indicating whether the access point i occupies the channel k to send the tth file to the user j,
indicating the channel quality of the link between access point s and user c on channel k,
indicating the channel quality of the link between access point i and user c on channel k,
indicating that access point s sends an f-th file to user c on channel k
The power of (a) is determined,
representing the power, P, at which the access point i transmits the tth file to the user c on channel kmaxFor maximum transmission power of access point, Rc,fIndicating that user c receives the f-th file
The actual data rate of the data stream being,
representing transmission files
W denotes the channel bandwidth, σ2Represents the average power of Gaussian white noise, B represents the file bit rate set, and B ═ B1,B2,...,BM}，1() The indication function is represented by a representation of,
and the management server takes the transmission request and the storage information as input quantity of a preset transmission model, solves the preset transmission model and obtains actual transmission information.
S306, the management server sends actual transmission information.
S307, the storage server determines a file acquisition mode according to the actual transmission information.
And S308a, if the first file is not stored in the storage server, the storage server sends a file request to the content server through the core network.
S308b, the content server sends the file to the storage server.
S308c, if the storage server stores the first file, obtaining the actual bitrate version of the first file from the storage server.
More specifically, when the storage server stores the first file, the first file is directly extracted from the storage server. The method specifically comprises the following steps: when the most popular file or the second popular file is obtained, the storage server obtains the actual bit rate version of the part of files through cache, and when the second popular file is obtained, the storage server is used for converting file codes to obtain the actual bit rate version of the part of files.
S309, the storage server sends the first file information.
And S310, the second access point sends the actual bit rate version of the first file.
In the file transmission method provided in this embodiment, on one hand, the bit rate of the file can be adaptively adjusted according to the user requirement and the actual channel rate, and on the other hand, when a large number of users compete for spectrum resources, the non-orthogonal technology is used to improve the spectrum efficiency and the transmission rate, and further reduce the time delay for obtaining the file.
Fig. 4 is a schematic structural diagram of a management server according to an exemplary embodiment of the present invention. As shown in fig. 4, the present embodiment provides a management server 400 including:
a first obtaining module 401, configured to obtain a transmission request sent by a first access point and storage information sent by a storage server, where the transmission request includes: first file information, a request bit rate, location information of a first access point, and channel resource information;
a first determining module 402, configured to determine, according to the transmission request and the storage information, actual transmission information that meets a preset transmission model, so that the storage server determines a file obtaining manner according to the actual transmission information, and transmits, after obtaining the first file according to the file obtaining manner, the first file to the user through the second access point by using an actual channel resource, an actual transmission power, and an actual bit rate;
wherein, actually transmitting the information comprises: a second access point, actual channel resources, actual transmission power, and actual bit rate; the first access point is used for transmitting the request, the second access point is used for transmitting the first file, the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all the second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relation between the stored information and the second access point.
Optionally, the transmitting the request further comprises: channel quality information; the set of constraints further includes: a third constraint, a fourth constraint, a fifth constraint, and a sixth constraint;
the third constraint is used for constraining the relation among the second access point, the actual channel resource, the actual transmission power and the channel quality information;
the fourth constraint is used for constraining the relation between the second access point and the actual channel resource;
a fifth constraint for constraining the relationship between the actual bit rate and the requested bit rate;
a sixth constraint is used to constrain the actual transmission power to be less than the maximum transmission power.
Optionally, the objective function is specifically:
wherein, Bc,fIndicating that user c requests the transmission of the f-th file
C is more than or equal to 1 and less than or equal to C, F is more than or equal to 1 and less than or equal to F, C represents the total number of users, F represents the total number of files, L is a file set stored by a storage server, and L is { L ═ L ≦1,L2,...,LN}；
The first constraint is specifically:
the second constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point s occupies the channel k or not to send the f-th file to the user c
Indicating whether the access point i occupies the channel l to send the tth file v to the user cs,cIndicating whether the access point s can serve the user c,
indicating whether a storage server connected to the access point s has cached the file
S is an access point set in the network, C represents a user set, and K represents an available access point setThe channel set is S ═ 1,2,., S }, C ═ 1,2,., C }, K ═ 1,2,., K }, S is not less than 1, i is not less than S, F is not less than 1, t is not less than F, K is not less than 1, and l is not less than K.
Alternatively,
the third constraint is specifically:
the fourth constraint is specifically:
the fifth constraint is specifically:
the sixth constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point i occupies the channel k to send the tth file to the user j,
indicating the channel quality of the link between access point s and user c on channel k,
indicating the channel quality of the link between access point i and user c on channel k,
indicating that access point s sends an f-th file to user c on channel k
The power of (a) is determined,
representing the power, P, at which the access point i transmits the tth file to the user c on channel kmaxFor maximum transmission power of access point, Rc,fIndicating that user c receives the f-th file
The actual data rate of the data stream being,
representing transmission files
W denotes the channel bandwidth, σ2Represents the average power of Gaussian white noise, B represents the file bit rate set, and B ═ B1,B2,...,BM}。
Fig. 5 is a schematic structural diagram of a storage server according to an exemplary embodiment of the present invention, and as shown in fig. 5, the storage server 500 provided in this embodiment includes:
a second obtaining module 501, configured to obtain, from the actual transmission information, a second access point used for transmitting the first file; the actual transmission information is determined by the management server according to the transmission request, the storage information and the preset transmission model, and the actual transmission information comprises: the second access point, actual channel resources used for transmitting the first file, actual transmission power and actual bit rate; the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relationship between the stored information and the second access points;
a second determining module 502, configured to determine a file obtaining manner according to the storage information, and transmit the first file obtained according to the file obtaining manner to the user through the second access point by using the actual channel resource, the actual transmission power, and the actual bit rate.
Optionally, the second determining module 502 is specifically configured to:
if the first file is judged to be stored in the storage server according to the storage information, the first file is obtained from the storage server; or
If the storage server does not store the first file according to the storage information, the storage server acquires the file through the content server; the content server is a server storing a first file.
In short, the flight prompting device provided by the application can be used for executing the aircraft prompting method, and the content and the effect of the flight prompting device can be referred to the method part, which is not described in detail herein.
Fig. 6 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present invention. As shown in fig. 6, the electronic apparatus 600 of the present embodiment includes: a processor 601, and a memory 602, wherein,
a memory 602 for storing computer-executable instructions;
the processor 601 is configured to execute the computer-executable instructions stored in the memory to implement the steps performed by the receiving device in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 602 may be separate or integrated with the processor 601.
When the memory 602 is separately provided, the flow control apparatus 600 further includes a bus 603 for connecting the memory 602 and the processor 601.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer execution instruction is stored in the computer-readable storage medium, and when a processor executes the computer execution instruction, the file transmission method as described above is implemented.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A file transfer method, based on a transfer system including a management server, at least one storage server, and at least one access point, the method comprising:
the management server acquires a transmission request sent by a first access point and storage information sent by the storage server, wherein the transmission request comprises: first file information, a request bit rate, location information of the first access point, and channel resource information;
the management server determines actual transmission information meeting a preset transmission model according to the transmission request and the storage information, so that the storage server determines a file acquisition mode according to the actual transmission information, acquires an actual bit rate version of the first file according to the file acquisition mode, and transmits the actual bit rate version of the first file to a user through a second access point by using actual channel resources, actual transmission power and an actual bit rate;
wherein the actual transmission information includes: the second access point, the actual channel resources, the actual transmission power, and the actual bit rate; the first access point is the access point used for transmitting the transmission request, the second access point is the access point used for transmitting the first file, the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all the second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relationship between the stored information and the second access points.
2. The method of claim 1, wherein transmitting the request further comprises: channel quality information; the set of constraints further comprises: a third constraint, a fourth constraint, a fifth constraint, and a sixth constraint;
the third constraint is used for constraining the relationship among the second access point, the actual channel resource, the actual transmission power and the channel quality information;
the fourth constraint is for constraining a relationship between the second access point and the actual channel resource;
the fifth constraint is for constraining a relationship between an actual bit rate and the requested bit rate;
the sixth constraint is for constraining the actual transmission power to be less than a maximum transmission power.
3. The method according to claim 1 or 2, characterized in that the objective function is in particular:
wherein, Bc,fIndicating that user c requests the transmission of the f-th file
C is more than or equal to 1 and less than or equal to C, F is more than or equal to 1 and less than or equal to F, C represents the total number of users, F represents the total number of files, L is a file set stored by a storage server, and L is { L ═ L ≦1,L2,...,LN}；
The first constraint is specifically:
the second constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point s occupies the channel k or not to send the f-th file to the user c
Indicating whether the access point i occupies the channel l to send the tth file v to the user cs,cIndicating whether the access point s can serve the user c,
indicating whether a storage server connected to the access point s has cached the file
S is a set of access points in the network, C represents a set of users, K represents a set of available channels, S ═ 1, 2., S }, C ═ 1, 2., C }, K ═ 1, 2., K }, 1 ≦ S, i ≦ S, 1 ≦ F, t ≦ F, 1 ≦ K, and l ≦ K.
4. The method of claim 2,
the third constraint is specifically:
the fourth constraint is specifically:
the fifth constraint is specifically:
the sixth constraint is specifically:
wherein the content of the first and second substances,
indicating whether the access point i occupies the channel k to send the tth file to the user j,
indicating the channel quality of the link between access point s and user c on channel k,
indicating the channel quality of the link between access point i and user c on channel k,
indicating that access point s sends an f-th file to user c on channel k
The power of (a) is determined,
representing the power, P, at which the access point i transmits the tth file to the user c on channel kmaxFor maximum transmission power of access point, Rc,fIndicating that user c receives the f-th file
The actual data rate of the data stream being,
to representTransferring documents
W denotes the channel bandwidth, σ2Represents the average power of Gaussian white noise, B represents the file bit rate set, and B ═ B1,B2,...,BM}。
5. A file transfer method, based on a transfer system including a management server, at least one storage server, and at least one access point, the method comprising:
the storage server acquires a second access point used for transmitting the first file from the actual transmission information; the actual transmission information is determined by the management server according to the transmission request, the storage information and a preset transmission model, and the actual transmission information comprises: the second access point, actual channel resources used for transmitting the first file, actual transmission power and actual bit rate; the transmission model comprises an objective function and a constraint set, wherein the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relation between the stored information and the second access points;
and the storage server determines a file acquisition mode according to the storage information, and transmits the first file to a user through a second access point by using the actual channel resource, the actual transmission power and the actual bit rate after acquiring the first file according to the file acquisition mode.
6. The method according to claim 5, wherein the storage server determines a file acquisition manner according to the storage information, specifically comprising:
if the first file is judged to be stored in the storage server according to the storage information, the first file is obtained from the storage server; or
If the storage server does not store the first file according to the storage information, the storage server acquires the file through a content server; the content server is a server storing the first file.
7. A management server, comprising:
a first obtaining module, configured to obtain a transmission request sent by a first access point and storage information sent by a storage server, where the transmission request includes: first file information, a request bit rate, location information of the first access point, and channel resource information;
a first determining module, configured to determine, according to the transmission request and the storage information, actual transmission information that meets a preset transmission model, so that the storage server determines a file obtaining manner according to the actual transmission information, and transmits, after obtaining an actual bit rate version of the first file according to the file obtaining manner, to a user through a second access point using an actual channel resource, an actual transmission power, and an actual bit rate;
wherein the actual transmission information includes: the second access point, the actual channel resources, the actual transmission power, and the actual bit rate; the first access point is the access point used for transmitting the transmission request, the second access point is the access point used for transmitting the first file, the transmission model comprises an objective function and a constraint set, the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all the second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relationship between the stored information and the second access points.
8. A storage server, the storage server comprising:
the second acquisition module is used for acquiring a second access point used for transmitting the first file from the actual transmission information; the actual transmission information is determined by the management server according to the transmission request, the storage information and a preset transmission model, and the actual transmission information comprises: the second access point, actual channel resources used for transmitting the first file, actual transmission power and actual bit rate; the transmission model comprises an objective function and a constraint set, wherein the objective function is used for maximizing the actual bit rate, the constraint set comprises a first constraint and a second constraint, the first constraint is used for constraining all second access points which transmit the first file to the same user to transmit by adopting the same actual channel resource, and the second constraint is used for constraining the relation between the stored information and the second access points;
and the second determining module is used for determining a file acquisition mode according to the storage information, and transmitting the first file to a user through a second access point by using the actual channel resource, the actual transmission power and the actual bit rate after the first file is acquired according to the file acquisition mode.
9. A file transfer system, comprising: the management server of claim 7 and the storage server of claim 8.
10. An electronic device, comprising: at least one processor and memory;
wherein the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the file transfer method of any of claims 1-4.
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