CN108768602A - Independently exempt from the method that licensed band cell mobile communication systems selection authorized user feeds back CSI - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/0858—Random access procedures, e.g. with 4-step access with collision treatment collision detection
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- 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
- H04W16/14—Spectrum sharing arrangements between different networks
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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Abstract
The invention discloses a kind of methods independently exempted from licensed band cell mobile communication systems selection authorized user and feed back CSI, including：(1) base station carries out reception and the calculating of feedback delay to the CSI of user feedback；(2) base station selects which user to issue authorization signaling feedback CSI to according to the CSI and feedback delay of reporting of user by optimization aim model decision.The present invention is considered in LTE-U autonomous systems and authorized user feeds back CSI resource-constrained premises when Wi-Fi coexistence of systems, system can according to the resource number make and authorize the adaptive adjustment of feedback CSI numbers of users；The utility requirement that each user oneself may be different is considered simultaneously, when handling capacity index of correlation is optimization aim, the user of CSI can be fed back effectively to promote LTE-U autonomous system throughput performances come optimum choice mandate according to the CSI and feedback delay that user has fed back.
Description
Technical field
The invention belongs to mobile communication technology fields, and in particular to a kind of independently to exempt from licensed band cell mobile communication systems
Authorized user is selected to feed back the method for CSI.
Background technology
It is independent exempt from licensed band long term evolution (Long term evolution in unlicensed band,
LTE-U it is) a kind of technology for exempting from licensed band in assist be deployed in traditional LTE of no licensed band, can be used for being promoted
Capacity of cellular networks and alleviation licensed band flow increase the pressure brought.In order to obtain the higher availability of frequency spectrum, LTE-U is only
Erection system can still continue to use the reporting schemes of LTE system channel state information (Channel state information, CSI)：
Base station first selects authorized user to feed back CSI；The user for receiving the authorization signaling measures channel in specified position, then acquisition
CSI in sub-frame of uplink specify position feedback to base station；Base station receives the CSI of user feedback and extrapolates the CSI's
Then feedback delay carries out data transmission in downlink subframe according to CSI and its time delay.In this process, due to data and
Signaling is all transmitted in exempting from licensed band, this will make it face multiple challenges：
Challenge one：In order to liberally be coexisted with systems such as Wi-Fi, International Organization for standardization's third generation partner program
(3rd generation partnership project, 3GPP) provides that LTE-U autonomous systems use and is similar to Wi-Fi systems
The channel competition mode of carrier sense LBT (Listenbefore talk) access the channel for exempting from licensed band.Meanwhile 3GPP
It further provides that access exempts from the duration of licensed band channel no more than regulation duration, as a result, the signaling friendship of LTE-U autonomous systems every time
Mutually and data transmission procedure needs multiple channel access that could complete.Compared with LTE system, this keeps LTE-U autonomous systems each
The channel access moment is uncertain and feedback delay is larger.It is different from the fixed feedback delay of LTE system, LTE-U independent systems
The time delay of user feedback CSI has randomness in system, and then influences the decision that base station selected authorized user feeds back CSI.
Challenge two：In order to be compatible with the characteristic of LTE system time division duplex (Time Division Duplexing, TDD),
Signaling/data should be transmitted after each channel access of LTE-U autonomous systems at the subframe alignment moment.Because of the channel access using LBT
Mode, the LTE-U autonomous systems access channel moment, not necessarily lucky subframe alignment very might be used from the moment to the subframe alignment moment
The systems such as energy Wi-Fi can access channel, cause signaling/data transmission conflict between LTE-U autonomous systems and other systems, conflict
Subframe can be such that the CSI for the signaling and user feedback that the base station of LTE-U autonomous systems issues all can not may be successfully connect by conflict
It receives.
In the cellular system, patent PCT/US2013/03283 discloses a kind of user reference signal and channel state information
The system and method for feedback signal reference signal for wireless communication and CSI feedback provide system and method embodiment.Specially
Sharp PCT/US2016/015464 discloses a kind of uplink operation for exempting from the LTE in licensed band, even if wireless hair
Penetrate/receiving unit (Wireless transmit/receive unit, WTRU) receives configuration information from supplementary cell, with
Sub-frame of uplink executes corresponding operating.Patent WO2016/191091A1 is disclosed a kind of is suitable for LTE-U system control domains
System, method and apparatus, including the control domain processing of Transmission Time Interval, enhanced physical control channel, aperiodic CSI report and
The operations such as discontinuous reception, and these operations can be extended in LTE-U autonomous systems and use.However, due to LTE-U independent systems
The signaling of system is transmitted in exempting from licensed band and needs to share channel with Wi-Fi, compared to the LTE system of exclusive channel, LTE-U
The running time-frequency resource that autonomous system accesses channel is relatively fewer, so that natively more rare control resource further subtracts
It is few.Although above-mentioned patent proposes various CSI feedback schemes for cellular system, do not account for feeding back CSI in authorized user
Consumption it is resource-constrained under the premise of to feed back CSI user selection make design.
Invention content
In view of above-mentioned, independently to exempt from licensed band cell mobile communication systems selection authorized user anti-the present invention provides a kind of
The method for presenting CSI, can be obviously improved the handling capacity of LTE-U autonomous systems.
A kind of method independently exempted from licensed band cell mobile communication systems selection authorized user and feed back CSI, including it is as follows
Step：
(1) base station in LTE-U autonomous systems receives CSI that user has fed back and carries out downlink biography in base station's access channel
The feedback delay of each user CSI is extrapolated when defeated, and then is built and obtained CSI matrixes and feedback delay matrix；
(2) model that selection authorized user feeds back CSI is established, the base station of LTE-U autonomous systems passes through the Optimization Solution mould
Type Tactic selection goes out the user of next sub-authorization feedback CSI, to generate authorization signaling and be sent to each user；
(3) user parses the authorization signaling received, for being selected the user authorized then according to authorization signaling
In corresponding time-frequency location detect reference signal in channel and obtain CSI, and then by sub-frame of uplink by CSI feedback to base
It stands.
Further, about the reckoning of each user's CSI feedback time delay specified according in authorization signaling in the step (1)
Channel measurement instances and base station calculated to the difference at user's actual transmissions data moment.
Further, the size of the CSI matrixes is K × S, and the size of feedback delay matrix is K × N, and K is to be currently accessed
The number of users of base station, S are the number of sub-bands in channel, and N is the sub-frame number of base station the last time busy channel, CSI matrixes
In CSI of element value when being corresponding user's the last time feedback channel gain in corresponding subband, in feedback delay matrix
Element value is to be opened at the time of obtaining CSI from corresponding user's the last time measurement to corresponding to subframe in base station the last time busy channel
The time delay at moment beginning.
Further, the authorization signaling contain detection reference signal and feed back both CSI behavior in channel when
The user list of frequency position and base station selected next sub-authorization feedback CSI.
Further, the model that selection authorized user feeds back CSI is established in the step (2), detailed process is as follows：
2.1 base stations count current Wi-Fi number of nodes by intercepting the control frame and data frame frame originating point information of Wi-Fi nodes
Measure NwAnd calculate the probability τ that gives out a contract for a project of each Wi-Fi nodesw；
Joined according to MAC (Medium access control, media access control) layer of LTE-U autonomous systems 2.2 base stations
The N obtained in number and step 2.1wAnd τw, calculate the probability distribution of LTE-U autonomous system channel competition time delays；
2.3 obtain base station according to the probability distribution of LTE-U autonomous system channel competition time delays, by calculating accesses next time
Channel starts the probability that each subframe is conflicted by Wi-Fi；
2.4 determine the number of users upper limit of the lower sub-authorization feedback CSI in base station；
2.5, according to the probability distribution of LTE-U autonomous system channel competition time delays, CSI matrixes and feedback delay matrix, comment
Estimate and each user and be authorized to and two kinds of uncommitted feedback CSI is accessed in base station during channel starts each subframe next time
Desired message transmission rate on each subband；
2.6 data based on above-mentioned acquisition are established and feed back CSI for base station selected authorized user with drag；
Wherein：Indicate when independent variable beIn the case of k-th of user resource allocation utility function,
IkFor the base station selected indicator variable and I for authorizing k-th of user feedback CSIk=0 or 1, Ik=1 indicates that k-th of user is awarded
Power feedback CSI, Ik=0 indicates k-th of user uncommitted feedback CSI, NselThe use of CSI is fed back for the lower sub-authorization in base station
The amount upper limit,It accesses channel next time for base station and starts s-th of subband of the α subframe and be pre-assigned to the finger of k-th of user
Show variable andOr 1,Then indicate base station access next time channel start the α subframe s-th of subband be assigned
To k-th of user,It then indicates that base station accesses channel and starts s-th of subband of the α subframe next time and is not allocated to
K user,For corresponding indicator variable IkIn the case of k-th of user provided by time-frequency when channel is accessed in base station next time
The handling capacity obtained it is expected in source predistribution, and K is the number of users for being currently accessed base station, and α and s are natural number and 1≤α≤Nd, 1
≤ s≤S, S are the number of sub-bands in channel, NdFor the sub-frame number of base station busy channel next time.
Further, the step 2.1 calculates the probability τ that gives out a contract for a project of each Wi-Fi nodes by following formulaw：
Further, the handling capacityCalculation expression it is as follows：
Wherein：B is channel width, pc,αIndicate that base station accesses channel and starts what the α subframe was conflicted by Wi-Fi next time
Probability,For corresponding indicator variable IkIn the case of k-th of user access channel next time in base station and start the α subframe
In desired message transmission rate on s-th of subband.
Based on the above-mentioned technical proposal, the present invention has following advantageous effects：
(1) method of the selection authorized user feedback CSI of LTE-U autonomous systems proposed by the present invention is considered in LTE-U
Authorized user feeds back the resource-constrained premises of CSI when autonomous system and Wi-Fi coexistence of systems, system can according to the resource number
Make the adaptive adjustment for authorizing feedback CSI numbers of users.
(2) method of the selection authorized user feedback CSI of LTE-U autonomous systems proposed by the present invention considers each user
Oneself may different utility requirement can be according to the CSI that user has fed back and anti-when handling capacity index of correlation is optimization aim
The user that feedback time delay carrys out optimum choice mandate feedback CSI effectively promotes LTE-U autonomous system throughput performances.
Description of the drawings
Fig. 1 is LTE-U autonomous systems of the present invention base station and user carries out the flow chart of signaling and CSI interactions.
Fig. 2 is that LTE-U autonomous systems of the present invention base station receives CSI and issues the flow diagram of authorization signaling.
Fig. 3 is the base station selected model construction flow diagram for authorizing feedback CSI user of LTE-U autonomous systems of the present invention.
Fig. 4 is the model schematic that LTE-U autonomous systems of the present invention coexist with Wi-Fi.
Fig. 5 is LTE-U autonomous systems channel competition of the present invention and access schematic diagram.
Fig. 6 is LTE-U autonomous systems handling capacity simulation result curve graph of the present invention.
Fig. 7 is the algorithm flow chart that LTE-U autonomous systems of the present invention select authorized user's feedback CSI.
Specific implementation mode
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and specific implementation mode is to technical scheme of the present invention
It is described in detail.
The present invention is that the scene based on LTE-U autonomous systems and Wi-Fi coexistence of systems proposes that the coexistence scenario is：(a)
Licensed band is exempted from base station and user in LTE-U autonomous systems using the access of LBE (Load based equipment) scheme；
(b) after accessing channel, base station or user by send preserved signal to other systems until transmission data first subframe alignment
Moment；(c) base station and user alternately access channel, access the number of sub frames of channel for transmission data every time by LTE-U independent systems
Uplink and downlink business of uniting and the relevant regulations of 3GPP determine.
As shown in Figure 1, the present invention devises a kind of independent selection mandate for exempting from licensed band cell mobile communication systems
The method of user feedback CSI, this method comprises the following steps：
(1) base station in LTE-U autonomous systems receives the CSI of user feedback and is accessed in base station and believes in the uplink stage
Road extrapolated when downlink transfer the feedback delay of each user CSI, the matrix and feedback delay that the CSI of user feedback is formed
The matrix of composition is stored in the local of base station.
In LTE system, it is one solid to the feedback delay of user's transmission data to obtain CSI to reality from user's measurement
Definite value, and in LTE-U autonomous systems, feedback delay is variable.For the feedback delay of any one user, base station can be with
Difference at the time of measuring channel by recording the user and at the time of current base station is to user's transmission data obtains, operation
Step is as shown in Figure 2.
(2) model that selection authorized user feeds back CSI is established, the base station of LTE-U autonomous systems is selected by the model decision
The user for authorizing feedback CSI is selected, authorization signaling contains the time-frequency location for measuring channel and feeding back CSI.
It establishes selection and authorizes feedback CSI user models, channel is accessed in base station by estimating next time when, provided in given time-frequency
The handling capacity that LTE-U autonomous systems can obtain under the allocation plan of source authorizes feedback CSI user's decision to weigh this selection
Excellent summary.Wherein, the model construction process is as shown in figure 3, base station can obtain selection feedback CSI user's by following process
Decision：
2.1LTE-U autonomous systems base station counts Wi- by the control frame and data frame frame originating point information for intercepting Wi-Fi nodes
Fi number of nodes NwWith the probability τ that gives out a contract for a project of Wi-Fi nodesw, the probability calculation is as follows：
Wi-Fi parameters described in MAC layer parameter and a of 2.2 base stations according to LTE-U autonomous systems calculate autonomous system letter
Road competes the probability distribution of time delay.
2.3 probability distribution postponed according to the channel competition calculated in b, when calculating and obtaining base station's access channel next time
The Probability p that each subframe is conflicted by Wi-Fic,α。
2.4 access the number of sub frames and the channel uplink biography of user's access next time of channel downstream transmission according to base station current time
Defeated number of sub frames calculating current time can authorize the upper bound N of feedback CSI numbers of userssel。
2.5 according to the probability distribution of autonomous system channel competition time delay, CSI matrixes and feedback delay matrix, evaluates each
A user authorizes and is not selected each height for authorizing two kinds of CSI of feedback in base station's access channel next time when in selection
Expected data transmission rate in frame on each subband.
2.6 selected to authorize the user of feedback CSI according to following Optimized model decision current time.
Wherein：K indicates user index；K indicates the number of users in base station range；IkIndicate base station whether authorized user
K feeds back the indicator variable of CSI, Ik=1 indicates authorized user's k feedbacks, Ik=0 indicates that authorized user k is not fed back；Expression indicator variable is IkWhen user k (=1,
2 ..., K) handling capacity for it is expected acquisition is pre-allocated by running time-frequency resource in base station's access channel next time, wherein base station is to pass
Transmission of data and access channel number of sub frames be Nd, each subframe bandwidth on frequency domain is B and is divided into the mutually orthogonal sons of S
Band, pc,αIndicate the probability that the α subframe that base station's access channel starts next time is conflicted by Wi-Fi,Indicate base next time
S-th of subband of the α subframe that access channel starts of standing is pre-assigned to the indicator variable of user k,Indicate α
S-th of subband of a subframe is allocated to user k,Indicate that s-th of subband of the α subframe is not allocated to
User k,Indicate that in indicator variable be IkUnder conditions of start in base station's access channel next time α of user k
It is expected message transmission rate on s-th of subband in subframe；For withThe resource allocation of corresponding user k
Utility function；In order to which control selections authorized user feeds back the expense of CSI resources, NselIndicate that the mistake of channel is accessed in base station at this
The upper bound of feedback CSI numbers of users can be authorized in journey.
(3) user receives the authorization signaling from base station, and according to the instruction of signaling, user carries out the measurement of channel and acquisition
CSI, finally in sub-frame of uplink according to specific feedback scheme by CSI feedback to base station.
By LTE-U autonomous systems base station and user alternately the characteristic of access channel and periodically execute step (1)~
(3), base station decision after accessing channel is authorized the user of feedback CSI by selection.
It is one embodiment of the present of invention below, detailed process is as follows：
Fig. 4 gives the present embodiment scene that LTE-U autonomous systems coexist, and wherein LTE-U autonomous systems are by a base
It stands and K user forms, Wi-Fi systems are by NwA node composition, the channel that their shared bandwidth are B.Two systems are all saturation
Business model.The channel is divided into the S identical subbands of orthogonal and bandwidth by LTE-U autonomous systems.In the present embodiment, arrange
The mode of user feedback CSI is Threshold Feedback scheme in LTE-U autonomous systems, and λ indicates the door of the normalized feedback CSI of user
Limit, if the ratio of the mean value of sub-band channel gain and its channel gain that user measures is not less than λ, the CSI of the subband will be by
User feedback；Otherwise it is not fed back.Fig. 5 gives the channel competition of LTE-U autonomous systems and the schematic diagram of access.LTE-U is only
In erection system, the channel that user and when base station competitive channel perform similarly to the LBT of the carrier sense letter of Wi-Fi systems respectively is competing
Scheme is striven, the wherein long Z of backoff window is fixed value and is required for waiting for a distributed inter-frame space after having accessed channel every time
(Distributed inter-frame spacing, DIFS).Enable tdIndicate the duration of down channel competitive stage.Base station meeting
Preserved signal, which is sent, before the arrival of next subframe shows oneself busy channel.The duration in the stage is defined as td,r, the rank
Section is known as downlink reservation stage.Defining the total duration before base station's access channel (being known as the downlink pre-transmission stage) isWhereinIt is the function that rounds up, TsbFor the duration of the single subframe of busy channel.Work as transmission
When data (be defined as downlink and effectively transmit the stage), enable base station's access channel can continuous busy channel NdA subframe.For upper
Row data transmission, channel competition process be similar to before downlink transfer situation, wherein it is most important difference be backoff value be by
Base station selected (being randomly choosed from 0 to Z-1) and the same backoff value of all users to share.Base station is passed in downlink data
It is defeated middle the backoff value to be sent to all users.In addition, when sending preserved signal for transmitting uplink data, be user rather than
Base station sends preserved signal.Similar to the situation of downlink data transmission, t is enabledu、tu,r、tu,pAnd NuUp channel competition is indicated respectively
The duration in stage, the duration of uplink reservation stage, the duration in uplink pre-transmission stage and uplink effectively transmit the number of sub frames in stage.
In the present embodiment, N is enabledd=Nu=Nsb.Define qdAnd quIndicate that base station can authorize feedback CSI in single downlink subframe respectively
Number of users the upper bound and single sub-frame of uplink in can feed back CSI number of users the upper bound.
According to the base station selected model for authorizing feedback CSI user of the LTE-U autonomous systems described in Fig. 3, solve successively：
A. the probability distribution of LTE-U autonomous system channel competition time delays is calculated.
The number of nodes N of the long Z and Wi-Fi systems of fixation contention window of given LTE-U autonomous systemswAnd the probability τ that gives out a contract for a projectw, LTE-
The channel competition time delay t of the downlink transfer of U autonomous systemsdOr the channel competition time delay t of uplinkuProbability mass function phase
Together, all p (t) is used to indicate that it can pass through document " Modelling of synchronisation and energy
(author J.Li etc., is published in performance ofFBE-and LBE-based standalone LTE-U networks "
The Journal ofEngineering, vol.2017, no.7,2017) in propose the Poisson net based on probability generating function
Lattice algorithm acquires.
B. next downlink effectively transmits the probability that stage each subframe is conflicted.
The duration of Wi-Fi conflict transmission (is defined as Tc w) it is less than the duration T of a subframesb, thus only under
First subframe in row or the transmission of uplink valid data may be clashed with Wi-Fi systems.Use pc,1And pLIt indicates respectively
The collision probability of first subframe and base station or user send preserved signal in reserved period in the valid data transmission stage
Probability, then：
Wherein：I ∈ { d, u },Indicate biIt is positive integer, pLNumerical solution can pass through document " Modelling
of synchronisation and energy performance of FBE-and LBE-based standalone
LTE-U networks " (author J.Li etc. is published in The Journal ofEngineering, vol.2017, no.7,
2017) method in acquires.
To sum up, the collision probability of stage each subframe is effectively transmitted for next downlink to be summarized as：
C. the maximum number of user that the calculating downlink transfer stage can authorize.
Since first subframe may be conflicted by Wi-Fi, the CSI of control signaling and user feedback will not be arranged
It is transmitted in first subframe.The maximum number of users that then any one downlink transfer stage can authorize is：
Nsel≤min{qd(Nd-1),qu(Nu-1)}
D. expectation transmission rate of the calculating user in next downlink transfer stage.
It is I in indicator variablekUnder conditions of, user k s in the α subframe that base station's access channel next time starts
Expectation transmission rate of the height with transmitting data can be expressed as：
Due to indicator variable Ik=0 or Ik=1, it is right respectively to needWithBoth transmission rates are counted
It calculates.
At any time, the CSI that is reported recently in the base station stored of LTE-U autonomous systems user and its to current time
Feedback delay.Order matrix C and matrix d indicates that the matrix that the CSI reported by all users is formed is anti-with theirs respectively
Present the matrix that time delay is constituted, wherein Elements Ck,sRow k and s positioned at Matrix C arrange, and indicate user's k the last time feedback channels
CSI when gain on subband s.Element dk,αRow k and α positioned at matrix d arrange, and indicate from Ck,sIt is acquired and works as by user's measurement
The time delay of the α subframe start time in preceding downlink transfer stage.
In the current downlink transmission stage, if user k is not selected mandate feedback CSI, i.e. Ik=0, then user k is under
The desired data rates on s-th of subband in the α subframe in one downlink transfer stage are：
Wherein：λ is the feedback threshold value of user and the Threshold Feedback scheme of base station agreement；Gk,sIndicate that user k measures channel
The channel power gain obtained when s；It indicates to use son in the subframe α that next downlink effectively transmits the stage in base station
Actual channel gain when with s to user's k transmission datas；τk,αWhen indicating feedbacks of the user k from channel measurement to data transmission
Prolong.Under Rayleigh channel fading model, (made by document " Digital communication over fading channels "
Person M.Simon etc., is published in John Wiley Sons, 2000) in given feedback delay τ known tok,αUnder the conditions of Gk,sWith
Joint probability density function be：
Here ΩkIt is the mean value of user's k channel gains, I0() is the modified Bessel function of first kind zeroth order,It is related coefficient, φdIt is the largest Doppler frequency shift, J0() is first kind zero Bessel function；τk,α
Lower bound beA Tsb；Indicate that a is to belong to
Positive integer.P0{τk,α=aTsbIndicate feedback delay τk,α=aTsbProbability, can calculate in the following way：
In transmission data, if user is selected to carry out data transmission, transmission rate by the CSI reported according to user into
Row selection.With the relevant data rate of each CSI feedback determined by discrete channel fading grade.Furtherly, I
The range of subband gain is divided into N+1 fading range, Rn=[Ln,Ln+1), n=0,1 ..., N, wherein L0=0 and LN+1
=∞.If Gk,s∈Rn, the CSI of user feedback is Ck,s=n, base station will use data rate rnGive user's transmission data；Accordingly
Ground, when the actual channel gain of userWhen, user can successful data reception.
In the current downlink transmission stage, if user k is authorized to feedback CSI, i.e. Ik=1, then in next downlink
The stage of transmission, base station will be fed back based on user in next uplink stage new to the rate of user's k transmission datas
CSI is scheduled.On s-th of subband in the α subframe of next downlink transfer, expected data obtained by user k
Rate is：
Wherein：W is to make Lw≤λΩk<Lw+1The discrete data rates of establishment index；Feedback delay τk,αLower bound beA Tsb；Indicate that e is to belong toPositive integer.P1{τk,α=
eTsbIndicate feedback delay τk,α=eTsbProbability, can calculate in the following way：
E. when the fairness doctrine designs dispatching algorithm in proportion, utility function can be enabled
Correspondingly, the optimization problem of selection authorized user feedback CSI can be expressed as：
Wherein：X=[x1,x2,...,xK]T,I=[I1,I2,...,IK]T。
By the way that the one of variable of fixation is solved about another variable the problem of, above-mentioned optimization problem can be split
It is divided into following two sub-problems：
Wherein：
Wherein：
For SOP1, which can be solved by following algorithm：
Step 1：Iterations n=1, initialization iteration stopping thresholding ε, iteration step length u ∈ (0,1), utility function are set
IncrementIt is randomly provided the indicator variable of each user resources distributionWithGiven authorized user feeds back CSI
Indicator variable vector I.
Step 2：It computes repeatedlyWithAnd substep is executed, untilWherein
(a) subband in each subframe is allocated by following rule： Wherein k* indicates that s-th of subband in the α subframe in current downlink transmission stage is assigned to user
k*。
(b) it according to resource allocation result in (a), uses
Calculate the transmission rate that user accumulates in next effective downlink transfer stage on all subframes and all subbands.
(c) increment of utility function is updated：
Step 3：Algorithm terminates, output resource distribution instruction variable vector xopt=x(n)；Occur in above-mentioned algorithm description
(·)(n)Indicate the value that variable () is arranged in nth iteration.
For SOP2, which can be solved by following algorithm：
Step 1：The indicator variable of given each user resources distribution, is denoted as xk。
Step 2：According to the indicator variable xk of each user, calculateWith
Step 3：By βk,1/βk,0User is ranked up from big to small, and the indicator variable I of preceding Nsel user is setk
=1, the indicator variable of other users is 0.
Step 4：Algorithm terminates, and exports the indicator variable vector I that optimal authorized user feeds back CSIopt=I.
So former optimization problem can solve authorized user feedback CSI by the algorithm iteration of simultaneous SOP1 and SOP2
Indicator variable vector.Derivation algorithm DUS (Dynamic user selection) solution flow is as shown in fig. 7, its step
It is as follows：
Step 1：The CSI Matrix Cs for obtaining user and the time delay matrix d for corresponding to CSI are needed executing the preceding base station of scheduling decision.
Step 2：Iterations indicator variable n=1 is set, initialization iteration stopping thresholding ε, iteration step length u ∈ (0,1),
The increment of utility functionIt is randomly provided the indicator variable of each user resources distributionWithIt is fed back with authorized user
The indicator variable vector I of CSI(n)。
Step 3：It computes repeatedlyWithAnd repeat following sub-step
Suddenly, until
(a) subband in each subframe is allocated by following rule：
(b) it according to the resource allocation result in (a), calculates
With
(c) it pressesUser is ranked up from big to small, and preceding N is setselThe indicator variable of a userThe indicator variable of other users is 0.
(d) result of decision that CSI is fed back according to selection authorized user in the distribution of resource block in (a) and (c), according toIt calculates user and effectively transmits rank in next downlink
The transmission rate accumulated on all subframes and all subbands in section.
(e) utility function increment is updated：
Step 5：Algorithm terminates, and exports the indicator variable vector I that optimal authorized user feeds back CSIopt=I(n)。
The advantageous effect of present embodiment technical solution can be verified by following emulation.
We assume that there are one base station and multiple users in LTE-U autonomous systems, and with Wi-Fi systems Sharing Center frequency
For the bandwidth of the 20MHz of 5.75GHz, which is divided into 20 subbands of non-overlapping copies by LTE-U autonomous systems.LTE-U is only
The length T of subframe in erection systemsbWith the number of sub frames N of a busy channel continuously transmittedsb(uplink effectively transmission and downlink have
The number of sub frames for imitating transmission is identical) it is respectively 1ms and 3.The long Z of contention window of LTE-U autonomous systems is sized to 64.In order to
The time-varying Rayleigh declines for simulating different user, consider that user uses different movement speed vk=0.6+0.14 (k-1)
m/s.About the channel gain of user, it is similar to document " Joint evaluation ofchannel feedback
schemes,rate adaptation,and scheduling in OFDMA downlinks with feedback
(author S.Guharoy etc. is published in IEEE Trans.Veh.Technol.vol.62, no.4, pp.1719- to delays "
1732,2013), the channel gain mean value of all users is both configured to Ωk=Ω, in the present embodiment Ω=7.78dB.For
Data rate in LTE-U autonomous systems, bibliography " Evolveduniversal terrestrial radio access
(E-UTRA):Physical layerprocess " (LTE-U Forum, Tech.Spe.36.300v.13.3.0), it will be assumed that
There are 15 kinds of different rates, respectively rn, n=1,2 ..., 15.According to document " Performance
characteristics of cellular systems with different link adaptation
(author K.Baum etc. is published in IEEE Trans.Veh.Technol., vol.52, no.6, pp.1497- to strategies "
1507,2003), with the relevant thresholding of rate adaptation byIt acquires, whereinFor reality
Coding loss in coding.The feedback door of Threshold Feedback scheme is limited to λ=0.2.The parameter setting of Wi-Fi systems follows IEEE
802.11ac standards, the contention window of the maximum minimum for keeping out of the way exponent number and Wi-Fi of duration, the Wi-Fi of backoff period, which is grown, is respectively
9us, 5 and 32.Bibliography " Modeling ofsynchronization and energy performance ofFBE-
(author J.Li etc. is published in The Journal to and LBE-based standalone LTE-U networks "
OfEngineering, vol.2017, no.7,2017), in simulations, busy channel when Wi-Fi transmission collisions are arranged in we
Duration Tc wDuration with Wi-Fi success busy channels is respectively 284.72us and 540.72us.For the algorithm carried, u is set
=0.1 and ε=0.001.In order to ensure the accuracy of numerical result and simulation result, our simulation result is 5000 downlinks
The average value of experiment is repeated with uplink.
It, can be by when actually distribution resource makees data transmission in order to embody the advantage of channel-quality feedback user choosing method
Resource allocation is carried out according to the algorithm of SOP1 and then counts handling capacity.To be presented in Fig. 6 carried algorithm and compare algorithm
The result of LTE-U autonomous system handling capacities.It is different from carried algorithm, comparison algorithm is used when selection authorizes feedback CSI user
Random selection user carries out the scheme of CSI feedback.With the increase of number of users, each user is by the frequency of selection feedback CSI
It can reduce, correspondingly feedback delay will increase, and cause user is properly received when the transmission data of base station probability and LTE-U independent
The downlink throughput capacity of system can all decline.But compared with using comparison algorithm, when LTE-U autonomous systems use the selection proposed
Downlink throughput capacity declines the alleviation that can obtain bigger after authorizing the method for feedback CSI user.By taking K=10 as an example, work as Nw=6
When, carried algorithm makes the downlink throughput capacity of system improve 4.6% than comparison algorithm；And work as NwWhen=10, carried algorithm compares
5.5% is improved than algorithm.
The above-mentioned description to embodiment can be understood and applied the invention for ease of those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (7)
- Independently exempting from the method for licensed band cell mobile communication systems selection authorized user's feedback CSI 1. a kind of, including walks as follows Suddenly：(1) base station in LTE-U autonomous systems receives CSI that user has fed back and when base station's access channel carries out downlink transfer The feedback delay of each user CSI is extrapolated, and then builds and obtains CSI matrixes and feedback delay matrix；(2) model that selection authorized user feeds back CSI is established, the model is determined by Optimization Solution for the base station of LTE-U autonomous systems Plan selects the user of next sub-authorization feedback CSI, to generate authorization signaling and be sent to each user；(3) user parses the authorization signaling received, for being selected the user authorized then according to phase in authorization signaling The time-frequency location answered detects reference signal in channel and obtains CSI, so by sub-frame of uplink by CSI feedback to base station.
- 2. according to the method described in claim 1, it is characterized in that：About each user's CSI feedback time delay in the step (1) Reckoning is that the difference according to the channel measurement instances specified in authorization signaling with base station to user's actual transmissions data moment carries out It calculates.
- 3. according to the method described in claim 1, it is characterized in that：The size of the CSI matrixes is K × S, feedback delay matrix Size be K × N, K is the number of users for being currently accessed base station, and S is the number of sub-bands in channel, and N is to account for base station the last time With the sub-frame number of channel, in corresponding subband when the element value in CSI matrixes is corresponding user's the last time feedback channel gain On CSI, the element value in feedback delay matrix is nearest to base station at the time of obtaining CSI from corresponding user's the last time measurement The time delay of subframe start time is corresponded in busy channel.
- 4. according to the method described in claim 1, it is characterized in that：The authorization signaling contains detection reference signal and feedback The user list of time-frequency location and base station selected next sub-authorization feedback CSI of both CSI behaviors in channel.
- 5. according to the method described in claim 1, it is characterized in that：Selection authorized user is established in the step (2) feeds back CSI Model, detailed process is as follows：2.1 base stations count current Wi-Fi number of nodes N by intercepting the control frame and data frame frame originating point information of Wi-Fi nodeswAnd Calculate the probability τ that gives out a contract for a project of each Wi-Fi nodesw；2.2 base stations are according to the N obtained in the MAC layer parameter and step 2.1 of LTE-U autonomous systemswAnd τw, it is only to calculate LTE-U The probability distribution of erection system channel competition time delay；2.3 obtain base station according to the probability distribution of LTE-U autonomous system channel competition time delays, by calculating accesses channel next time Start the probability that each subframe is conflicted by Wi-Fi；2.4 determine the number of users upper limit of the lower sub-authorization feedback CSI in base station；2.5, according to the probability distribution of LTE-U autonomous system channel competition time delays, CSI matrixes and feedback delay matrix, evaluate Each user is being authorized to and two kinds of uncommitted feedback CSI accesses channel in base station and starts each son in each subframe next time Take desired message transmission rate；2.6 data based on above-mentioned acquisition are established and feed back CSI for base station selected authorized user with drag；Wherein：Indicate when independent variable beIn the case of k-th of user resource allocation utility function, IkFor The base station selected indicator variable and I for authorizing k-th of user feedback CSIk=0 or 1, Ik=1 indicates that k-th of user is authorized to instead Present CSI, Ik=0 indicates k-th of user uncommitted feedback CSI, NselThe number of users of CSI is fed back for the lower sub-authorization in base station The upper limit,It accesses channel next time for base station and starts s-th of subband of the α subframe and be pre-assigned to the instruction of k-th user and become Amount andOr 1,It then indicates that base station accesses channel and starts s-th of subband of the α subframe next time and is assigned to K user,It then indicates that base station accesses channel and starts s-th of subband of the α subframe next time to be not allocated to k-th User,For corresponding indicator variable IkIn the case of k-th of user it is pre- by running time-frequency resource when channel is accessed in base station next time The handling capacity obtained it is expected in distribution, and K is the number of users for being currently accessed base station, and α and s are natural number and 1≤α≤Nd, 1≤s ≤ S, S are the number of sub-bands in channel, NdFor the sub-frame number of base station busy channel next time.
- 6. according to the method described in claim 5, it is characterized in that：The step 2.1 calculates each Wi-Fi by following formula The probability τ that gives out a contract for a project of nodew：
- 7. according to the method described in claim 5, it is characterized in that：The handling capacityCalculation expression it is as follows：Wherein：B is channel width, pc,αIndicate that base station accesses channel and starts the probability that the α subframe is conflicted by Wi-Fi next time,For corresponding indicator variable IkIn the case of k-th of user access channel next time in base station and start s in the α subframe Desired message transmission rate on height band.
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