CN108390945A - A kind of file transmission of wireless buffer network and wave beam forming design method - Google Patents

A kind of file transmission of wireless buffer network and wave beam forming design method Download PDF

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Publication number
CN108390945A
CN108390945A CN201810281514.7A CN201810281514A CN108390945A CN 108390945 A CN108390945 A CN 108390945A CN 201810281514 A CN201810281514 A CN 201810281514A CN 108390945 A CN108390945 A CN 108390945A
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China
Prior art keywords
base station
file
user
centroid
beam forming
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费泽松
杨小龙
李磊
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A kind of file transmission of wireless buffer network and wave beam forming design method belong to wave beam forming design and power distributing technique field.Step is：1 user initiates the request to required file to base station；The channel gain and noise power that 2 users obtain to associated base station feedback path loss and channel measurement information；3 base stations obtain the buffer status for being requested file, and h is fed back in base station to Centroid at this timeij, qfi, cfj, pi,noiseAnd propagation delay time d of the requested file from Centroid to base stationjf；4 Centroids calculate the file transfer ratio that user is asked the launching beam figuration value of user and base station in base station；5 Centroids issue corresponding wave beam forming value and file transfer ratio to base station；6 base stations file transmission is initiated to user according to corresponding wave beam forming value and file transfer ratio.The present invention is dynamically adapted the file size that base station is sent to user；It ensure that the fairness between user.

Description

A kind of file transmission of wireless buffer network and wave beam forming design method
Technical field
The present invention provides a kind of transmission of the file of wireless buffer network and wave beam forming design methods, belong to wireless access Cloud network, wave beam forming design and power distributing technique field.
Background technology
The wireless network that develops into of 5th generation wireless network (5G) supports more to need the applications of mass data, such as enhancing and Virtual reality technology (AR/VR), video-game etc., have paved road.The low delay character of data transmission is a large amount of to these needs The application of data is most important, because of the excessively high overall experience quality (QoE) that will influence user of network delay.In order to reduce cloud The download time delay of user in wireless network (C-RANs), in a base station and the corresponding effective wave beam forming of design by file cache Design method causes the extensive concern of academia and industrial quarters.
User asks the probability of different files to differ greatly in certain periods in wireless buffer network, i.e., according to network Tidal effect, it is many that the probability that a part of file is requested by a user is higher by other requested files, that is to say, that has very High popularity.Due to the unbalanced characteristic of file popularity distribution, it is popular that corresponding buffer memory device caching is installed in base station side Spend high file, with reduce file to user transmission range, and then reduce user obtain needed for file network transfer delay. Meanwhile such network transmission mode avoids the file that user asks every time, is obtained from the file server of distal end, is reduced The load of core net and backhaul link.
Existing cache file transmission strategy and wave beam forming design method, although the download time delay of user can be reduced, It is that both important influence user files are downloaded the factors of time delays and all separately studied.The transmission strategy of cache file is only The size of backhaul time delay is only influenced, and wave beam forming design method is to reduce the propagation delay time between base station and user.It Preceding document is the transmission strategy or wave beam forming algorithm for design of single research cache file, such the result is that only The propagation delay time between backhaul time delay or base station and user can be reduced.So how to consider the transmission plan of cache file Slightly and wave beam forming design method becomes a urgent problem to be solved to reduce the download time delay of user.The purpose of the present invention is It is dedicated to solving above-mentioned cache file transmission strategy with wave beam forming design method co-design, under the file to reduce user Carry time delay.
Invention content
The purpose of the present invention is in wireless buffer network, considering the transmission strategy of cache file and wave beam forming, Reduce the file download time delay of user, it is proposed that file transmission and the wave beam forming design method of a kind of wireless buffer network.
A kind of file transmission of wireless buffer network and wave beam forming design method, abbreviation this method；That is relied on is wireless Buffer network system, including：I single-antenna subscriber, J base station, a Centroid, wherein I single-antenna subscriber and J base The position stood is random, and the antenna number of each base station is NT, each base station is equipped with storage device and comes cache file, Centroid storage The All Files of user's request, each base station is connected to Centroid by wired or wireless backhaul link；And Centroid It being capable of the channel state information of link and the case where each node B cache file between real-time perception base station and user；
This method includes Centroid to base station and base station to the file transmitting policy of user；
Wherein, the file transmitting policy of Centroid to base station is embodied as：For user request file, base station to The user transmits the Proportionality design of this document, i.e., the file percentage that Centroid is issued to base station；
Wherein, the file percentage that Centroid is issued to base station, abbreviation file transfer ratio；
Base station transmits the launching beam Shape design of file to user to the file transmitting policy of user, i.e. base station, referred to as Wave beam forming designs；When specific design：In view of between base station and user on Radio Link path loss, decline and noise, Centroid is distributed to the propagation delay time of each base station return link and the popularity of file；Wherein, Centroid is to each The propagation delay time of base station return link returns time delay；
Base station to user file transmitting policy, specially：Centroid stores the file of all user's requests, and base station is deposited Storage equipment has cached a part of file of user's request；User can access one or more base station, and multiple base stations can be right User initiates cooperation file transmission, and each base station determines that the ratio influences Centroid simultaneously and arrives to each user file transfer ratio The file of base station transmits；When user initiates file request, according to the channel quality of Radio Link, base station between base station and user Whether file transfer ratio of the base station to user, Centroid pass to base station is determined to the buffer status of user file, passback time delay The launching beam Shape design of defeated file and base station to user；
The distance of user i and base station j are dij, path loss isChannel h between user i and base station jijObey certain Decline distribution, noise is that power is pI, noiseAdditive white Gaussian noise, pjFor base station j maximum transmission power；SiIt is connect for user i All collection of base stations entered, SiIn all base stations can to user transmit file；
A kind of file transmission of wireless buffer network and wave beam forming design method, include the following steps：
When step 1, user i need file f, to SiIn base station initiate to transmit request to the file of f, base station receives user After the file transmission request that i is sent, file request variable q is updatedfi：
Step 2, user i belong to S to alliBase station j feedbacks obtained based on path loss and channel measurement information Channel gain hijWith noise power pI, noise；
Step 3, base station obtain the buffer status for being requested file f, update cfj：
Obtain cfjAfterwards, h is fed back in base station to Centroidij, qfi, cfj, pI, noise, and for file f Centroid to base The propagation delay time d to standjf；
Step 4, Centroid obtain the h that base station is fed back to Centroid in step 3ij, qfi, cfj, pI, noise, Yi Jizhen To the propagation delay time d of file f Centroid to base stationjfAfterwards, launching beams of the base station j to user i is determined by following sub-step Figuration value wij, file transfer ratio xs of the base station j to the user i file fs askedI, f, j；
The count value of step 4.1 system initialization iteration count, iteration count count value are denoted as t；Initialize iteration Counter t=0 initializes launching beam forming vectorsFile transfer ratio variableIteration ends thresholding ∈1；
Step 4.2 calculatesIteration ends door is set Limit ∈2, iteration count n=0, wherein
If step 4.3 n=0, useInitializationUsing f(n)=f(t)Initialize f(n)；
Step 4.4n=n+1 solves problems with and obtains
exp(-βij)≤log2(1+rij),
Step 4.5 obtains current optimal objective valuePass throughUpdatePass through f(n) =f*Update f(n)；
Step 4.6 calculates | f(n)-f(n-1)|, if | f(n)-f(n-1)| ＜ ∈1, arrive step G；Otherwise return to step 4.3；
Step 4.7t=t+1 is calculated
Wherein
Step 4.8 is according to file popularity distribution pfWith file size Lf, obtain being directed to file f user base station j to user i Propagation delay time
Step 4.9 obtains the base station j of propagation delay time minimum for user i and file f*=argminjτifj, and according to such as Lower formula calculates
Step 5, the count value for updating iteration count calculateCalculate | ft-f(t-1)|=| ft-fpre|, if | ft-fpre| ＜ ∈2, arrive step 6；Otherwise return to step 4.2；
Step 6, Centroid issue correspondence to base station jWithIfAnd cfj=0, then centromere Point is issued the documents f to base station j simultaneously；
Step 7, base station j are according to receivingDecide whether to transmit file f to user i, ifIt adopts base station WithFile transmission is initiated to user i for launching beam figuration, does not otherwise initiate file transmission.
Advantageous effect
A kind of file transmission of wireless buffer network of the present invention and wave beam forming design method, with other file transmitting policies And wave beam forming design method is compared, and is had the advantages that：
1. base station can be supported according to the link circuit condition of base station and user, the dynamic file for adjusting base station and being sent to user Size；
2. the file transmission of the wireless buffer network proposed and wave beam forming design method are with the average download of user Prolonging target as an optimization makes the download delay variation between each user become smaller, and ensure that the fairness between user.
Description of the drawings
Fig. 1 is that a kind of file transmission of wireless buffer network of the present invention and the downlink of wave beam forming design method wirelessly cache Network scenarios figure；
Fig. 2 is that a kind of file transmission of wireless buffer network of the present invention and the downlink of wave beam forming design method wirelessly cache Network scenarios figure；
Fig. 3 is that the file in the present invention and embodiment transmits and the user of wave beam forming design method and other schemes is average Comparison diagram of the download time delay in different Zipf；
Fig. 4 is that the file in the present invention and embodiment transmits and the user of wave beam forming design method and other schemes is average Comparison diagram of the time delay under different base station antenna case.
Specific implementation mode
To keep the target, technical solution and advantage of the present invention more explicit, below in conjunction with attached drawing to the present invention's Embodiment is described in detail.The present embodiment is with the technical scheme is that guidance carries out actual practice veritification, simultaneously Detailed embodiment and specific operating process are given, but protection scope of the present invention is not only limited in following implementation Example.
Embodiment 1
Assuming that network topology is 3 rectangular areas 500m*500m, respectively there are one macro base station, this macro bases for each regional center It stands and covers entire rectangular net region, and each macro base station configures 4 antennas, memory space having the same.9 users with Machine is distributed in simulating area, and user equipment is mounted with individual antenna, if the minimum range of user to base station is 400m；System bandwidth For 1MHz, noise power spectral density is -106dBm/Hz, and channel path loss and shadow fading are expressed as 128.1+37.6log10 (d)+N (0,8) dB, wherein d (units：Km) it is distance of the user to service micro-base station.Each micro-base station maximum transmission power phase Together, it is 5W.Number of files is 15, and each file size randomly chooses between 8~10Mbit, and file temperature obeys Zipf points Cloth.
The file transmission of wireless buffer network proposed by the present invention and the flow of wave beam forming design method are as follows：
Step A, when user i needs file f, to SiIt initiates to transmit request to the file of f in middle base station；Base station receives user's hair After the file transmission request sent, file request variable q is updatedfi：
Step B, user i belongs to S to alliBase station j feedbacks obtained based on path loss and channel measurement information Channel gain hijWith noise power pI, noise=10-10W；
Step C, base station obtains the buffer status for being requested file f, updates cfj：
Obtain cfjAfterwards, h is fed back in base station to Centroidij, qfi, cfj, pI, noise, and for file f Centroid to base The propagation delay time d to standjf；
Step D, after Centroid obtains above-mentioned value, launching beam figurations of the base station j to user i is determined by following steps Value wij, file transfer ratio xs of the base station j to the user i file fs askedifj。
A., iteration count t=0 is set, launching beam forming vectors are initializedFile transfer ratio variable Iteration ends thresholding ∈1；
B. it calculatesIteration ends thresholding ∈ is set2, Iteration count n=0, wherein
C. it if n=0, usesInitializationUsing f(n)=f(t)Initialize f(n)
D.n=n+1 solves problems with and obtains
exp(-βij)≤log2(1+rij),
E. current optimal objective value is obtainedPass throughUpdatePass through f(n)=f*More New f(n),
F. calculate | f(n)-f(n-1)|, if | f(n)-f(n-1)| ＜ 0.005 arrives step G；Otherwise return to step C.
G.t=t+1 is calculated
Wherein
H. according to file popularity distribution pfWith file size Lf, obtain the transmission for file f user base station j to user i Time delay
I. for user i and file f, the base station j of propagation delay time minimum is obtained*=argminjτifj, and according to following formula It calculates
J.Calculate | ft-f(t-1)|=| ft-fpre|, if | ft-fpre| ＜ 0.005, arrive step 5；Otherwise return to step B.
Step E, Centroid issues correspondence to base station jWithIfAnd cfj=0, then center Node is issued the documents f to base station j simultaneously.
Step F, base station j is according to receivingDecide whether to transmit file f to user i, ifIt adopts base station WithFile transmission is initiated to user i for launching beam figuration, does not otherwise initiate file transmission.
5 kinds of schemes in following table are compared respectively in test, test performance is that the performance under 1000 groups of topologys is average.
The file transmission for the wireless buffer network that table 1 proposes and wave beam forming design method and other four kinds of scheme comparisons
Scheme User accesses and power allocation scheme
Scheme 1 The beamforming algorithm and file transmitting policy of proposition
Scheme 2 The beamforming algorithm of proposition waits file percentages transmission strategy
Scheme 3 The beamforming algorithm of proposition, random file ratio transmission strategy
Scheme 4 The beamforming algorithm of proposition, the only file policy of transmission buffer
Scheme 5 The beamforming algorithm of proposition, the transmission strategy of no cache file
Fig. 3 gives as file popularity parameter increases the situation of change of user's average delay size.It can be seen that adopting It is transmitted with the file of the wireless buffer network of the present invention and can substantially reduce user's average delay after wave beam forming design method.Figure 4 give that file popularity parameter is certain, as antenna for base station number increases the situation of change of the average download time delay of user, use When putting forward file transmission and the wave beam forming design method of wireless buffer network, the average download time delay of user is relative to no caching File transmitting policy compared to decline 47.4%.
In conclusion the file transmission of wireless buffer network proposed by the present invention and wave beam forming design method can be effective The average download time delay for reducing user has actual application value to the advantage of lifting system performance.
Above-described specific descriptions have all carried out the purpose, technical scheme and advantage benefit of invention further detailed Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this Within the protection domain of invention.

Claims (3)

1. file transmission and the wave beam forming design method of a kind of wireless buffer network, it is characterised in that：It is arrived including Centroid The file transmitting policy of base station and base station to user；
Wherein, the file transmitting policy of Centroid to base station is embodied as：For the file of user's request, base station is to the use Transmit the Proportionality design of this document, i.e., the file percentage that Centroid is issued to base station in family；
Wherein, the file percentage that Centroid is issued to base station, abbreviation file transfer ratio；
The launching beam Shape design of file, abbreviation wave beam are transmitted to user to the file transmitting policy of user, i.e. base station in base station Shape design；When specific design：In view of path loss, decline and noise between base station and user on Radio Link, center Node is distributed to the propagation delay time of each base station return link and the popularity of file；Wherein, Centroid is to each base station The propagation delay time of return link returns time delay；
Base station to user file transmitting policy, specially：Centroid stores the file of all user's requests, and base station stored is set The standby a part of file for having cached user's request；User can access one or more base station, and multiple base stations can be to user Cooperation file transmission is initiated, each base station determines that the ratio influences Centroid to base station simultaneously to each user file transfer ratio File transmission；When user initiates file request, according to the channel quality of Radio Link between base station and user, base station to The buffer status of family file, passback time delay determine file transfer ratio of the base station to user, and it is literary whether Centroid transmits to base station The launching beam Shape design of part and base station to user；
The distance of user i and base station j are dij, path loss isChannel h between user i and base station jijObey certain decline point Cloth, noise are that power is pi,noiseAdditive white Gaussian noise, pjFor base station j maximum transmission power；SiFor the institute of user's i accesses There are collection of base stations, SiIn all base stations can to user transmit file.
2. file transmission and the wave beam forming design method of a kind of wireless buffer network as described in claim 1, referred to as we Method；The wireless buffer network system relied on, it is characterised in that：Including：I single-antenna subscriber, J base station, a centromere Point, the wherein position of I single-antenna subscriber and J base station are random, and the antenna number of each base station is NT, each base station is equipped with storage Device carrys out cache file, and Centroid stores the All Files of user's request, and each base station passes through wired or wireless backhaul chain Road is connected to Centroid；And Centroid being capable of the channel state information of link and each between real-time perception base station and user The case where a node B cache file.
3. a kind of file transmission of wireless buffer network as described in claim 1 and wave beam forming design method, feature exist In：Include the following steps：
When step 1, user i need file f, to SiIn base station initiate to transmit request to the file of f, base station receives user i and sends File transmission request after, update file request variable qfi：
Step 2, user i belong to S to alliThe channels that are obtained based on path loss and channel measurement information of base station j feedbacks increase Beneficial hijWith noise power pi,noise；
Step 3, base station obtain the buffer status for being requested file f, update cfj：
Obtain cfjAfterwards, h is fed back in base station to Centroidij, qfi, cfj, pi,noise, and for file f Centroid arrive base station Propagation delay time djf；
Step 4, Centroid obtain the h that base station is fed back to Centroid in step 3ij, qfi, cfj, pi,noise, and it is directed to file Propagation delay time d of the f Centroids to base stationjfAfterwards, launching beam figuration values of the base station j to user i is determined by following sub-step wij, file transfer ratio xs of the base station j to the user i file fs askedi,f,j；
The count value of step 4.1 system initialization iteration count, iteration count count value are denoted as t；Initialize iteration count Device t=0 initializes launching beam forming vectorsFile transfer ratio variableIteration ends thresholding ∈1；
Step 4.2 calculatesIteration ends thresholding ∈ is set2, Iteration count n=0, wherein
If step 4.3 n=0, useInitializationUsing f(n)=f(t)Initialize f(n)；
Step 4.4n=n+1 solves problems with and obtains
exp(-βij)≤log2(1+rij),
Step 4.5 obtains current optimal objective valuePass throughUpdatePass through f(n)=f*More New f(n)；
Step 4.6 calculates | f(n)-f(n-1)|, if | f(n)-f(n-1)|<∈1, arrive step G；Otherwise return to step 4.3；
Step 4.7t=t+1 is calculated
Wherein
Step 4.8 is according to file popularity distribution pfWith file size Lf, obtain the biography for file f user base station j to user i Defeated time delay
Step 4.9 obtains the base station j of propagation delay time minimum for user i and file f*=argminjτifj, and according to such as following formula Son calculates
Step 5, the count value for updating iteration count calculateCalculate | ft-f(t-1)|=| ft-fpre|, if | ft-fpre|<∈2, arrive step 6；Otherwise return to step 4.2；
Step 6, Centroid issue correspondence to base station jWithIfAnd cfj=0, then Centroid is same When issue the documents f to base station j；
Step 7, base station j are according to receivingDecide whether to transmit file f to user i, ifBase station usesFile transmission is initiated to user i for launching beam figuration, does not otherwise initiate file transmission.
CN201810281514.7A 2018-04-02 2018-04-02 A kind of file transmission of wireless buffer network and wave beam forming design method Pending CN108390945A (en)

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