CN114257647B - Conference video caching method, server and system based on D2D communication - Google Patents

Conference video caching method, server and system based on D2D communication Download PDF

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CN114257647B
CN114257647B CN202111573347.1A CN202111573347A CN114257647B CN 114257647 B CN114257647 B CN 114257647B CN 202111573347 A CN202111573347 A CN 202111573347A CN 114257647 B CN114257647 B CN 114257647B
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conference video
content package
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target participant
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CN114257647A (en
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马云鹏
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Industrial and Commercial Bank of China Ltd ICBC
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Industrial and Commercial Bank of China Ltd ICBC
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H04L1/0018—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1813—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for computer conferences, e.g. chat rooms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/04—Constraint-based CAD

Abstract

The invention provides a conference video caching method, a server and a system based on D2D communication, and particularly relates to the technical field of 5G, wherein the method comprises the following steps: constructing a target participant terminal to acquire a total delay function of a content package of the conference video from other participant terminals and a base station; establishing an optimization model according to the total delay function; and solving the optimization model to obtain the content package of the conference video which is required to be acquired by the target participant terminal. The method and the system can rapidly calculate the conference video content package which is required to be cached by the target participant terminal when the video content is large and the number of participants is large, so as to reduce delay generated during caching.

Description

Conference video caching method, server and system based on D2D communication
Technical Field
The invention relates to the technical field of communication, in particular to the 5G technical field, and especially relates to a conference video caching method, a server and a system based on D2D communication.
Background
In today's video conference, D2D (Device-to-Device) communication methods are widely used. However, in video conferences, more and more video content is available, which can cause that when a large number of participants send out a cache request to the video content in the video conferences based on D2D communication, for each participant, the process of calculating the content packet that needs to be cached will take a long time, and thus network congestion will occur, resulting in a huge delay and affecting the efficiency of the conference.
Disclosure of Invention
The invention aims to provide a conference video caching method based on D2D communication, which aims to solve the problem that the process of calculating conference video content packets which are required to be cached by target participant terminals takes longer time. It is another object of the present invention to provide a server. It is a further object of the invention to provide a system. It is a further object of the invention to provide a computer device. It is a further object of the invention to provide a readable medium.
To achieve the above object, an aspect of the present invention discloses a video buffering method for a conference based on D2D communication, the method comprising:
constructing a target participant terminal to acquire a total delay function of a content package of the conference video from other participant terminals and a base station;
establishing an optimization model according to the total delay function;
and solving the optimization model to obtain the content package of the conference video which is required to be acquired by the target participant terminal.
Optionally, before the constructing the total delay function of the content package of the conference video by the target participant terminal from other participant terminals and the base station, the method further includes: and judging other participant terminals which can acquire the content package by the target participant terminal.
Optionally, the determining the other participant terminals to which the target participant terminal can be connected includes:
and judging that other participant terminals with the distance between the target participant terminal and other participant terminals being smaller than the first threshold value are other participant terminals capable of acquiring the content package for the target participant terminal.
Optionally, the constructing the target participant terminal obtains the total delay function of the content package of the conference video from other participant terminals and the base station, including:
constructing a first function representing the number of content packages of the conference video acquired by the target participant terminal from other participant terminals;
constructing a second function representing the number of content packets of the conference video acquired by the target participant terminal from the base station;
acquiring the delay of a content package from other participant terminals according to a first function and the target participant terminals, and acquiring the first delay of all the content packages of the conference video acquired from the other participant terminals by the target participant terminals;
acquiring the delay of the content package of one conference video from the base station according to the second function and the target participant terminal, and acquiring the second delay of all the content packages of the conference video acquired from the base station by the target participant terminal;
And obtaining a total delay function according to the first delay and the second delay.
Optionally, the constructing a first function that indicates the number of content packages that the target participant terminal obtains conference video from other participant terminals includes:
and obtaining the first function according to the total number of video content packets transmitted to the target participant terminal by all other participant terminals.
Optionally, the plurality of content packets are formed by encoding a plurality of segments of the conference video, and the constructing a second function representing the number of content packets of the conference video acquired by the target participant terminal from the base station includes:
and obtaining a second function according to the first function and the fragment number of the conference video fragments.
Optionally, the establishing an optimization model according to the total delay function includes:
taking the minimum value of the total delay function as a target, and establishing constraint conditions;
and establishing an optimization model according to the constraint conditions and the total delay function.
Optionally, the constraint condition includes:
the method comprises the steps of a first constraint condition, wherein the first constraint condition is that the cache capacity of a target participant terminal is larger than or equal to the total size of a content package acquired by the target participant terminal;
The second constraint condition is that content packages transmitted by other participant terminals to the target participant terminal are cached in the other participant terminals;
a third constraint condition, wherein the third constraint condition is that for one content package, the target participant terminal cannot be repeatedly obtained from other participant terminals;
a fourth constraint condition, wherein the fourth constraint condition is whether a target participant terminal is acquired for a content package;
and a fifth constraint, wherein the fifth constraint is whether other participant terminals are transmitted to the target participant terminal for a content package.
Optionally, the solving the optimization model to obtain the content package of the conference video required to be acquired by the target participant terminal includes:
substituting each content package of all conference videos into an optimization model, and judging whether the content package accords with all constraint conditions in the optimization model; and when the meeting information is accordant, determining the content package as the content package of the meeting video which is required to be acquired by the target participant terminal.
Optionally, before the constructing the total delay function of the content package of the conference video by the target participant terminal from other participant terminals and the base station, the method further includes:
Dividing the conference video into a plurality of segments; and obtaining content packages of a plurality of conference videos according to the fragments.
To achieve the above object, another aspect of the present invention discloses a server comprising:
the total delay function framework module is used for constructing a total delay function of a content package of the conference video obtained by the target participant terminal from other participant terminals and the base station;
the optimization model building module is used for building an optimization model according to the total delay function;
and the content package output module is used for solving the optimization model to obtain the content package of the conference video which is required to be acquired by the target participant terminal.
The invention also discloses a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the method as described above when executing said program.
The invention also discloses a computer readable medium having stored thereon a computer program which when executed by a processor implements a method as described above.
According to the conference video caching method, the server and the system based on the D2D communication, the total delay function of the content package of the conference video is obtained from other participant terminals and the base station through the construction of the target participant terminal, and the total delay index required to be optimized can be specifically expressed as the total delay function, so that the step-down transition of the optimization model can be established for the total delay function in the subsequent step, and the feasibility and pertinence of the step-down transition of the optimization model can be realized, and the speed of the process of calculating the conference video content package required to be cached by the target participant terminal can be improved; according to the total delay function, an optimization model is established, and the conditions of the content packets to be cached can be definitely limited, so that the screening speed of the target participant terminal when the content packets are cached is increased, and further the conference video content packets to be cached by the target participant terminal can be calculated more quickly; and solving the optimization model to obtain the content package of the conference video which is required to be obtained by the target participant terminal, so that the content package which is required to be cached by the target participant terminal can be accurately and rapidly obtained, and compared with the prior art, the overall caching speed can be improved. In summary, the conference video caching method, the server and the system based on the D2D communication provided by the invention can rapidly calculate the conference video content package which needs to be cached by the target participant terminal when the video content is larger and the number of participants is larger, so as to reduce the delay generated during caching.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a conference video caching system based on D2D communication according to an embodiment of the present invention;
fig. 2 illustrates a conference video buffering method based on D2D communication according to an embodiment of the present invention;
FIG. 3 illustrates an alternative video conferencing caching method based on D2D communication in accordance with an embodiment of the present invention;
FIG. 4 illustrates another alternative video conferencing caching method based on D2D communication in accordance with an embodiment of the present invention;
FIG. 5 shows a schematic diagram of the modules of a server according to an embodiment of the invention;
fig. 6 shows a schematic diagram of a computer device suitable for use in implementing embodiments of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," … …, and the like, as used herein, do not denote a particular order or sequence, nor are they intended to be limiting of the invention, but rather are merely used to distinguish one element or operation from another in the same technical terms.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
As used herein, "and/or" includes any or all combinations of such things.
The embodiment of the invention discloses a conference video cache system based on D2D communication, which comprises a D2D conference network 105 and a server 101, as shown in fig. 1, wherein the D2D conference network 105 comprises a target participant terminal 104 and other participant terminals 102 and 103. It should be noted that, the number of the target participant terminals and the number of other participant terminals may be set according to actual situations, and are not limited to the number shown in fig. 1.
The server 101 is configured to construct a total delay function of the content package of the conference video obtained by the target participant terminal 104 from two paths of other participant terminals 102 and 103 and the base station, and according to the total delay function, an optimization model is built, and the optimization model is solved, so as to obtain the content package of the conference video required to be obtained by the target participant terminal 104.
The conference video caching system based on the D2D communication disclosed by the embodiment of the invention can rapidly calculate the conference video content package which needs to be cached by the target participant terminal 104 when the video content is larger and the number of participants is larger, so as to reduce delay generated during caching.
The following describes a process of implementing the video conference caching method based on D2D communication according to the embodiment of the present invention, taking the server 101 as an execution body as an example. It can be understood that the implementation subject of the conference video buffering method based on D2D communication provided in the embodiment of the present invention includes, but is not limited to, the server 101.
Based on this, the embodiment of the invention discloses a conference video caching method based on D2D communication, as shown in fig. 2, the method specifically comprises the following steps:
s201: and constructing a target participant terminal to acquire the total delay function of the content package of the conference video from other participant terminals and the base station.
S202: and establishing an optimization model according to the total delay function.
S203: and solving the optimization model to obtain the content package of the conference video which is required to be acquired by the target participant terminal.
According to the conference video caching method, the server and the system based on the D2D communication, the total delay function of the content package of the conference video is obtained from other participant terminals and the base station through the construction of the target participant terminal, and the total delay index required to be optimized can be specifically expressed as the total delay function, so that the step-down transition of the optimization model can be established for the total delay function in the subsequent step, and the feasibility and pertinence of the step-down transition of the optimization model can be realized, and the speed of the process of calculating the conference video content package required to be cached by the target participant terminal can be improved; according to the total delay function, an optimization model is established, and the conditions of the content packets to be cached can be definitely limited, so that the screening speed of the target participant terminal when the content packets are cached is increased, and further the conference video content packets to be cached by the target participant terminal can be calculated more quickly; and solving the optimization model to obtain the content package of the conference video which is required to be obtained by the target participant terminal, so that the content package which is required to be cached by the target participant terminal can be accurately and rapidly obtained, and compared with the prior art, the overall caching speed can be improved. In summary, the conference video caching method, the server and the system based on the D2D communication provided by the invention can rapidly calculate the conference video content package which needs to be cached by the target participant terminal when the video content is larger and the number of participants is larger, so as to reduce the delay generated during caching.
In an alternative embodiment, the construction target participant terminal obtains the total delay function of the content package of the conference video from two paths of other participant terminals and the base station, including:
constructing a first function representing the number of content packages of the conference video acquired by the target participant terminal from other participant terminals;
constructing a second function representing the number of content packets of the conference video acquired by the target participant terminal from the base station;
acquiring the delay of a content package from other participant terminals according to a first function and the target participant terminals, and acquiring the first delay of all the content packages of the conference video acquired from the other participant terminals by the target participant terminals;
acquiring the delay of the content package of one conference video from the base station according to the second function and the target participant terminal, and acquiring the second delay of all the content packages of the conference video acquired from the base station by the target participant terminal;
and obtaining a total delay function according to the first delay and the second delay.
Illustratively, the total delay function may be expressed as:
wherein,representing the output of the total delay function, m represents the number of all participants in the office network, P fK Representing popularity of video conferences, F representing a set of conference videos contained in the current network, +.>Terminal u for representing target participants i Acquiring the number of content packages of conference video from other participant terminals +.>Terminal u for representing target participants i Acquiring the number of content packets of conference video from a base station, f k The current conference video is represented, i represents the number of the target participants, s in the corner mark represents the number of the content package, and D d The delay of the target participant terminal to acquire a content package from other participant terminals is represented, D b The delay of the target participant terminal to acquire the content package of one conference video from the base station is represented. In actual situations, there is usually D d <D b But are not limited thereto, and may be determined by one skilled in the art according to circumstances.
Wherein the first delay is of the above formulaThe second delay is +.>Part(s).
The total delay function of the content package of the conference video is obtained from other participant terminals and the base station through the construction of the target participant terminal, and the total delay index required to be optimized can be specifically expressed as the total delay function, so that the step abrupt change of the optimization model can be established for the total delay function in the subsequent steps, and the feasibility and pertinence of the step abrupt change of the optimization model can be realized, and the speed of the process of calculating the conference video content package required to be cached by the target participant terminal can be improved.
In an alternative embodiment, the constructing a first function representing the number of content packages of the conference video acquired by the target participant terminal from other participant terminals includes:
and obtaining the first function according to the total number of video content packets transmitted to the target participant terminal by all other participant terminals.
Illustratively, the first function may be expressed as:
wherein,representing the output of the first function,/->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of->Can be a binary variable, in particular When 1, other participants terminal u is represented j Terminal u for meeting target participants i Transmitting a current conference video f k Is the s-th content package of->When 0, other participants terminal u is represented j Terminal u for no-meeting target participants i Transmitting a current conference video f k I represents the number of the target participant, j represents the number of the other participants, s in the corner mark represents the number of the content package, ga represents the set of the other participants, and +_>Representing a current conference video f k Is a collection of content packages of (a).
In an alternative embodiment, the plurality of content packets are formed by encoding a plurality of segments of the conference video, and the constructing a second function representing the number of content packets of the conference video acquired by the target participant terminal from the base station includes:
And obtaining a second function according to the first function and the fragment number of the conference video fragments.
Illustratively, the second function may be expressed as:
wherein,representing the output of the second function,/->Representing a current conference video f k The number of fragments, i, represents the number of the target participants, and s in the corner mark represents the number of the content package. It can be seen from the above equation that when the target participant terminal acquires the number of content packages of the conference video from other participant terminals +.>Less than the current conference video f k Fragment number of fragments->Output of the second functionThe value is +.>Meaning that the target participant terminal also needs to be obtained from the base stationAnd recovering the complete current conference video content by the content package, wherein if the output value of the second function is 0, the target participant terminal can recover the complete current conference video content without acquiring the content package from the base station. Illustratively, the current conference video f k The segments of (2) are realized by a preset code division mode, and the preset code division mode can be obtained by selecting the existing code division mode by a person skilled in the art according to actual conditions. Wherein (1)>Also representing the output of the first function.
In an optional embodiment, the building an optimization model according to the total delay function includes:
taking the minimum value of the total delay function as a target, and establishing constraint conditions;
and establishing an optimization model according to the constraint conditions and the total delay function.
According to the total delay function, an optimization model is established, and the conditions of the content packets to be cached can be definitely limited, so that the screening speed of the target participant terminal when the content packets are cached is increased, and further the conference video content packets to be cached by the target participant terminal can be calculated more quickly.
In an alternative embodiment, the constraint includes:
the method comprises the steps of a first constraint condition, wherein the first constraint condition is that the cache capacity of a target participant terminal is larger than or equal to the total size of a content package acquired by the target participant terminal;
the second constraint condition is that content packages transmitted by other participant terminals to the target participant terminal are cached in the other participant terminals;
a third constraint condition, wherein the third constraint condition is that for one content package, the target participant terminal cannot be repeatedly obtained from other participant terminals;
A fourth constraint condition, wherein the fourth constraint condition is whether a target participant terminal is acquired for a content package;
and a fifth constraint, wherein the fifth constraint is whether other participant terminals are transmitted to the target participant terminal for a content package.
Illustratively, the first constraint may be expressed as C1, and further, may be expressed as:
wherein f k Representing the current conference video, F representing the set of conference videos contained in the current network, s in the corner mark representing the content packet number,representing a current conference video f k Is a collection of content packages, cf k S represents the current conference video f k Size of the s-th content package, < +.>Indicating whether the target participant terminal caches the current conference video f k I represents the number of the target participant, C i Terminal u for representing target participants i Is used for the cache capacity of the storage device. Further, the total size of the content package acquired by the target participant terminal is +.>Part(s).
Illustratively, the second constraint may be expressed as C2, and further, may be expressed as:
wherein i represents the number of the target participant, j represents the numbers of other participants, and f k Representing the current conference video, s in the corner mark represents the content package number,terminal u for representing other participants j Whether to cache the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of (c).
Illustratively, the third constraint may be expressed as C3, and further, may be expressed as:
wherein U represents the set of other participants, i represents the number of the target participant, j represents the number of the other participants, and f k Representing the current conference video, s in the corner mark represents the content package number,representing a current conference video f k Is a set of content packages->Indicating whether the target participant terminal caches the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of (c).
Illustratively, the fourth constraint may be expressed as C4, and further, may be expressed as:
wherein i represents the number of the target participant, f k Representing the current conference video, s in the corner mark represents the content package number,indicating whether the target participant terminal caches the current conference video f k Is the s-th content package of (c). Here->Is a binary variable +.>When 1 is shown, the target participant terminal caches the current conference video f k Is the s-th content package of->When the video is 0, the target participant terminal does not cache the current conference video f k Is the s-th content package of (c).
Illustratively, the fifth constraint may be expressed as C5, and further, may be expressed as:
wherein i represents the number of the target participant, j represents the numbers of other participants, and f k Representing the current conference video, s in the corner mark represents the content package number,terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of (c). Here->Is a binary variable +.>When 1, other participants terminal u is represented j Terminal u for meeting target participants i Transmitting a current conference video f k Is the s-th content package of->When 0, other participants terminal u is represented j Terminal u for no-meeting target participants i Transmitting a current conference video f k Is the s-th content package of (c).
Further, the optimization model, which is composed of the first constraint, the second constraint, the third constraint, the fourth constraint, and the fifth constraint, may be specifically expressed as:
Wherein,indicating that the optimization model is targeted to take a minimum value for the total delay function.
In an optional implementation manner, the solving the optimization model to obtain the content package of the conference video required to be acquired by the target participant terminal includes:
substituting each content package of all conference videos into an optimization model, and judging whether the content package accords with all constraint conditions in the optimization model; and when the meeting information is accordant, determining the content package as the content package of the meeting video which is required to be acquired by the target participant terminal.
Illustratively, for each of the content packages of all conference videos, it is substituted into the optimization modelAnd judging whether each constraint condition in the substituted optimization model can be met or not in the parameters, judging that the content package accords with all constraint conditions in the optimization model only when all constraint conditions are met, determining that the content package is the content package of the conference video which needs to be acquired by the target participant terminal, and caching the content package by the target participant terminal. Specifically, the optimization model is expressed as:
it should be noted that the division in the optimization modelOther parameters can be obtained directly by the person skilled in the art through the existing data acquisition mode or preset according to the actual situation.
And solving the optimization model to obtain the content package of the conference video which is required to be obtained by the target participant terminal, so that the content package which is required to be cached by the target participant terminal can be accurately and rapidly obtained, and compared with the prior art, the overall caching speed can be improved.
Based on this, the embodiment of the invention discloses an optional conference video caching method based on D2D communication, as shown in fig. 3, which specifically comprises the following steps:
s301: and judging other participant terminals which can acquire the content package by the target participant terminal.
S302: and constructing a target participant terminal to acquire the total delay function of the content package of the conference video from other participant terminals and the base station.
S303: and establishing an optimization model according to the total delay function.
S304: and solving the optimization model to obtain the content package of the conference video which is required to be acquired by the target participant terminal.
In an alternative embodiment, the determining the other participant terminals to which the target participant terminal can be connected includes:
and judging that other participant terminals with the distance between the target participant terminal and other participant terminals being smaller than the first threshold value are other participant terminals capable of acquiring the content package for the target participant terminal.
Illustratively, this can be expressed as follows:
N(i)={u j |u j ∈U,||d i- d j ||＜R d2d }
wherein N (i) represents a set of other participant terminals capable of acquiring content packages by the target participant terminal, i represents a target participant number, j represents other participant numbers, and u j Representing other participant terminals, U representing a set of other participant terminals, R d2d Represents a first threshold, R in an embodiment of the invention d2d Also denoted maximum distance of D2D communication, D i Representing the geographic position of the terminal ui of the target participant, d j Terminal u for representing other participants j Is determined by the geographic location of (a). R is as follows d2d The value of (2) may be set according to the actual scene, or may be set as the maximum distance of D2D communication in the actual scene, and the maximum distances of D2D communication in different scenes may be different.
Wherein, the distance between the target participant terminal and other participant terminals is expressed as d i- d j ||。
The step of judging the other participant terminals capable of acquiring the content package by the target participant terminal can avoid the target participant terminal from trying to be connected with all the other participant terminals, so that the target participant terminal is only connected with the other participant terminals capable of acquiring the content package, and the time in the whole conference video caching process is further reduced.
It should be noted that, for the descriptions of step S302 to step S304, reference may be made to the descriptions of step S201 to step S203 in the embodiments of the present invention, and the descriptions are not repeated here.
Based on this, the embodiment of the invention discloses another optional conference video caching method based on D2D communication, as shown in fig. 4, which specifically includes the following steps:
s401: dividing the conference video into a plurality of fragments, and obtaining content packages of the conference videos according to the fragments.
S402: and constructing a target participant terminal to acquire the total delay function of the content package of the conference video from other participant terminals and the base station.
S403: and establishing an optimization model according to the total delay function.
S404: and solving the optimization model to obtain the content package of the conference video which is required to be acquired by the target participant terminal.
In an optional implementation manner, the dividing the conference video into a plurality of segments, and obtaining content packages of the plurality of conference videos according to the segments specifically includes:
the conference video is divided into a plurality of segments by the existing encoding mode (such as the maximum distance separable code MDS) and the segments are encoded into a plurality of content packets. Wherein the number of content packets is greater than or equal to the number of fragments, and the plurality of content packets are independent of each other and are not duplicated.
The conference video is divided into a plurality of fragments, and the content packages of the conference video are obtained according to the fragments, so that the conference video can be divided into the content packages in advance, the situation that the target participant terminal needs to divide the content packages of the video before caching the content packages is avoided, the corresponding time can be saved, and the delay generated during caching is further reduced.
It should be noted that, for the descriptions of step S402 to step S404, reference may be made to the descriptions of step S201 to step S203 in the embodiments of the present invention, and the descriptions are not repeated here.
Based on the same principle, the embodiment of the present invention discloses a server 500, as shown in fig. 5, the server 500 includes:
the total delay function framework module 501 is used for constructing a total delay function of a content package of the conference video obtained by the target participant terminal from other participant terminals and a base station;
an optimization model building module 502, configured to build an optimization model according to the total delay function;
and the content package output module 503 is configured to solve the optimization model, and obtain a content package of the conference video that needs to be acquired by the target participant terminal.
In an alternative embodiment, the total delay function framework module 501 is further configured to:
And judging other participant terminals which can acquire the content package by the target participant terminal.
In an alternative embodiment, the total delay function framework module 501 is configured to:
and judging that other participant terminals with the distance between the target participant terminal and other participant terminals being smaller than the first threshold value are other participant terminals capable of acquiring the content package for the target participant terminal.
In an alternative embodiment, the total delay function framework module 501 is configured to:
constructing a first function representing the number of content packages of the conference video acquired by the target participant terminal from other participant terminals;
constructing a second function representing the number of content packets of the conference video acquired by the target participant terminal from the base station;
acquiring the delay of a content package from other participant terminals according to a first function and the target participant terminals, and acquiring the first delay of all the content packages of the conference video acquired from the other participant terminals by the target participant terminals;
acquiring the delay of the content package of one conference video from the base station according to the second function and the target participant terminal, and acquiring the second delay of all the content packages of the conference video acquired from the base station by the target participant terminal;
And obtaining a total delay function according to the first delay and the second delay.
In an alternative embodiment, the total delay function framework module 501 is configured to:
and obtaining the first function according to the total number of video content packets transmitted to the target participant terminal by all other participant terminals.
In an alternative embodiment, the total delay function framework module 501 is configured to:
and obtaining a second function according to the first function and the fragment number of the conference video fragments.
In an alternative embodiment, the optimization model building module 502 is configured to:
taking the minimum value of the total delay function as a target, and establishing constraint conditions;
and establishing an optimization model according to the constraint conditions and the total delay function.
In an alternative embodiment, the constraint includes:
the method comprises the steps of a first constraint condition, wherein the first constraint condition is that the cache capacity of a target participant terminal is larger than or equal to the total size of a content package acquired by the target participant terminal;
the second constraint condition is that content packages transmitted by other participant terminals to the target participant terminal are cached in the other participant terminals;
A third constraint condition, wherein the third constraint condition is that for one content package, the target participant terminal cannot be repeatedly obtained from other participant terminals;
a fourth constraint condition, wherein the fourth constraint condition is whether a target participant terminal is acquired for a content package;
and a fifth constraint, wherein the fifth constraint is whether other participant terminals are transmitted to the target participant terminal for a content package.
In an alternative embodiment, the content package output module 503 is configured to:
substituting each content package of all conference videos into an optimization model, and judging whether the content package accords with all constraint conditions in the optimization model; and when the meeting information is accordant, determining the content package as the content package of the meeting video which is required to be acquired by the target participant terminal.
In an alternative embodiment, the total delay function framework module 501 is further configured to:
dividing the conference video into a plurality of segments; and obtaining content packages of a plurality of conference videos according to the fragments.
Since the principle of the server 500 for solving the problem is similar to that of the above method, the implementation of the server 500 can be referred to the implementation of the above method, and will not be described herein.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
In a typical example the computer apparatus comprises in particular a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the method as described above when said program is executed.
Referring now to FIG. 6, a schematic diagram of a computer device 600 suitable for use in implementing embodiments of the present application is shown.
As shown in fig. 6, the computer apparatus 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate works and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 608 into a Random Access Memory (RAM)) 603. In the RAM603, various programs and data required for the operation of the system 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other through a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a liquid crystal feedback device (LCD), and the like, and a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 605 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on drive 610 as needed, so that a computer program read therefrom is mounted as needed as storage section 608.
In particular, according to embodiments of the present invention, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method shown in the flowchart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 609, and/or installed from the removable medium 611.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims (9)

1. The conference video caching method based on D2D communication is characterized by comprising the following steps of:
constructing a target participant terminal to acquire a total delay function of a content package of the conference video from other participant terminals and a base station;
establishing an optimization model according to the total delay function;
solving the optimization model to obtain a content package of the conference video which is required to be acquired by the target participant terminal;
the total delay function is:
wherein,representing the output of the total delay function, m represents the number of all participants in the office network, P fK Representing popularity of video conferences, F representing a set of conference videos contained in the current network, +.>Representing a first function>Representing a second function, f k The current conference video is represented, i represents the number of the target participants, s in the corner mark represents the number of the content package, and D d The delay of the target participant terminal to acquire a content package from other participant terminals is represented, D b The delay of a target participant terminal for acquiring a content packet of a conference video from a base station is represented;
the first function is:
wherein,representing the output of the first function, y i,j,fk,s Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s content package, y i,j,fk,s Is a binary variable, y i,j,fk,s E {0,1}, i represents the number of the target participant, j represents the number of the other participants, S in the corner mark represents the number of the content package, ga represents the set of the other participants, S fk Representing a current conference video f k Is a collection of content packages;
the second function is:
wherein L is fk Representing a current conference video f k The number of fragments, i, represents the number of the target participant, s in the corner mark represents the number of the content package,an output representing the first function;
wherein the optimization model comprises:
s.t.C1:
C2:
C3:
C4:
C5:
wherein,representing that the optimization model aims at obtaining the minimum value of the total delay function, C1 represents a first constraint condition, f k Representing the current conference video, F represents the set of conference videos contained in the current network, S in the corner mark represents the content package number, S fk Representing a current conference video f k C) fk,s Representing a current conference video f k Size of the s-th content package, < +.>Indicating whether the target participant terminal caches the current conference video f k I represents the number of the target participant, C i Terminal u for representing target participants i Wherein C2 represents a second constraint condition, i represents the number of the target participating person, j represents the number of other participating persons, and f k Representing the current conference video, s in the corner mark represents the content package number,terminal u for representing other participants j Whether to cache the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k C3 represents a third constraint condition, U represents a set of other participants, i represents a target participant number, j represents the number of other participants, f k S in the corner mark represents the number of the content package and S represents the current conference video fk Representing a current conference video f k Is a set of content packages->Indicating whether the target participant terminal caches the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k C4 represents a fourth constraint, i represents the number of the target participant, f k S in the corner mark represents the content package number and ++>Indicating whether the target participant terminal caches the current conference video f k C5 represents a fifth constraint, i represents a target participant number, j represents other participant numbers, f k S in the corner mark represents the content package number and ++>Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of (c).
2. The method of claim 1, further comprising, prior to the constructing the target participant terminal obtaining the total delay function of the content package of the conference video from both the other participant terminals and the base station: and judging other participant terminals which can acquire the content package by the target participant terminal.
3. The method according to claim 2, wherein said determining other participant terminals to which the target participant terminal can connect comprises:
and judging that other participant terminals with the distance between the target participant terminal and other participant terminals being smaller than the first threshold value are other participant terminals capable of acquiring the content package for the target participant terminal.
4. The method according to claim 1, wherein the solving the optimization model to obtain the content package of the conference video that the target participant terminal needs to obtain includes:
substituting each content package of all conference videos into an optimization model, and judging whether the content package accords with all constraint conditions in the optimization model; and when the meeting information is accordant, determining the content package as the content package of the meeting video which is required to be acquired by the target participant terminal.
5. The method of claim 1, further comprising, prior to the constructing the target participant terminal obtaining the total delay function of the content package of the conference video from both the other participant terminals and the base station:
dividing the conference video into a plurality of segments; and obtaining content packages of a plurality of conference videos according to the fragments.
6. A server, comprising:
the total delay function framework module is used for constructing a total delay function of a content package of the conference video obtained by the target participant terminal from other participant terminals and the base station;
the optimization model building module is used for building an optimization model according to the total delay function;
the content package output module is used for solving the optimization model to obtain a content package of the conference video which is required to be acquired by the target participant terminal;
the total delay function is:
wherein,representing the output of the total delay function, m represents the number of all participants in the office network, P fK Representing popularity of video conferences, F representing a set of conference videos contained in the current network, +.>Representing a first function>Representing a second function, f k The current conference video is represented, i represents the number of the target participants, s in the corner mark represents the number of the content package, and D d The delay of the target participant terminal to acquire a content package from other participant terminals is represented, D b The delay of a target participant terminal for acquiring a content packet of a conference video from a base station is represented;
the first function is:
wherein,representing the output of the first function,/->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of->Is a binary variable +.>i represents the number of the target consultant, j represents the numbers of other consultants, S in the corner mark represents the number of the content package, ga represents the set of other consultants, S fk Representing a current conference video f k Is a collection of content packages;
the second function is:
wherein L is fk Representing a current conference video f k The number of fragments, i, represents the number of the target participant, s in the corner mark represents the number of the content package,an output representing the first function;
wherein the optimization model comprises:
s.t.C1:
C2:
C3:
C4:
C5:
wherein,representing that the optimization model aims at obtaining the minimum value of the total delay function, C1 represents a first constraint condition, f k Representing the current conference video, F represents the set of conference videos contained in the current network, S in the corner mark represents the content package number, S fk Representing a current conference video f k C) fk,s Representing a current conference video f k Size of the s-th content package, < +.>Indicating whether the target participant terminal caches the current conference video f k I represents the number of the target participant, C i Terminal u for representing target participants i Wherein C2 represents a second constraint condition, i represents the number of the target participating person, j represents the number of other participating persons, and f k Representing the current conference video, s in the corner mark represents the content package number,terminal u for representing other participants j Whether to cache the current conference video f k Is the s-th content package of (2)，/>Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k C3 represents a third constraint condition, U represents a set of other participants, i represents a target participant number, j represents the number of other participants, f k S in the corner mark represents the number of the content package and S represents the current conference video fk Representing a current conference video f k Is a set of content packages->Indicating whether the target participant terminal caches the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k C4 represents a fourth constraint, i represents the number of the target participant, f k S in the corner mark represents the content package number and ++>Indicating whether the target participant terminal caches the current conference video f k C5 represents a fifth constraint, i represents a target participant number, j represents other participant numbers, f k S in the corner mark represents the content package number and ++>Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of (c).
7. The conference video caching system based on the D2D communication is characterized by comprising a D2D conference network and a server, wherein the D2D conference network comprises target participant terminals and other participant terminals;
the server is used for constructing a total delay function of the content package of the conference video obtained by the target participant terminal from other participant terminals and the base station, establishing an optimization model according to the total delay function, and solving the optimization model to obtain the content package of the conference video required to be obtained by the target participant terminal;
The total delay function is:
wherein,representing the output of the total delay function, m represents the number of all participants in the office network, P fK Representing popularity of video conferences, F representing a set of conference videos contained in the current network, +.>Representing a first function>Representing a second function, f k The current conference video is represented, i represents the number of the target participants, s in the corner mark represents the number of the content package, and D d The delay of the target participant terminal to acquire a content package from other participant terminals is represented, D b The delay of a target participant terminal for acquiring a content packet of a conference video from a base station is represented;
the first function is:
wherein,representing the output of the first function,/->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of->Is a binary variable +.>i represents the number of the target consultant, j represents the numbers of other consultants, S in the corner mark represents the number of the content package, ga represents the set of other consultants, S fk Representing a current conference video f k Is a collection of content packages;
the second function is:
wherein L is fk Representing a current conference video f k The number of fragments, i, represents the number of the target participant, s in the corner mark represents the number of the content package, An output representing the first function;
wherein the optimization model comprises:
s.t.C1:
C2:
C3:
C4:
C5:
wherein,representing that the optimization model aims at obtaining the minimum value of the total delay function, C1 represents a first constraint condition, f k Representing the current conference video, F represents the set of conference videos contained in the current network, S in the corner mark represents the content package number, S fk Representing a current conference video f k C) fk,s Representing a current conference video f k Size of the s-th content package, < +.>Indicating whether the target participant terminal caches the current conference video f k I represents the number of the target participant, C i Terminal u for representing target participants i Wherein C2 represents a second constraint condition, i represents the number of the target participating person, j represents the number of other participating persons, and f k Representing the current conference video, s in the corner mark represents the content package number,terminal u for representing other participants j Whether to cache the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k C3 represents a third constraint condition, U represents a set of other participants, i represents a target participant number, j represents the number of other participants, f k S in the corner mark represents the number of the content package and S represents the current conference video fk Representing a current conference video f k Is a set of content packages->Indicating whether the target participant terminal caches the current conference video f k Is the s-th content package of->Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k C4 represents a fourth constraint, i represents the number of the target participant, f k S in the corner mark represents the content package number and ++>Indicating whether the target participant terminal caches the current conference video f k C5 represents a fifth constraint, i represents a target participant number, j represents other participant numbers, f k S in the corner mark represents the content package number and ++>Terminal u for representing other participants j Whether to target participant terminal u i Transmitting a current conference video f k Is the s-th content package of (c).
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1-5 when the program is executed by the processor.
9. A computer readable medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1-5.
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CN112492255A (en) * 2020-11-20 2021-03-12 杭州叙简科技股份有限公司 Low-delay spanning tree audio and video conference method based on 5G
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