CN106792734B - Utilize the heterogeneous network disturbance coordination method of three-dimensional statistic channel information - Google Patents
Utilize the heterogeneous network disturbance coordination method of three-dimensional statistic channel information Download PDFInfo
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- CN106792734B CN106792734B CN201710052439.2A CN201710052439A CN106792734B CN 106792734 B CN106792734 B CN 106792734B CN 201710052439 A CN201710052439 A CN 201710052439A CN 106792734 B CN106792734 B CN 106792734B
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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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- 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
- H04W16/18—Network planning tools
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/225—Calculation of statistics, e.g. average, variance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
- H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
Abstract
The invention discloses a kind of heterogeneous network downlink interference collaboration methods using three-dimensional statistic channel information, there are several low-power wireless access node share spectrum resources in macrocell base stations coverage area in heterogeneous network, macrocell base stations use uniform planar antenna array, macrocell base stations successively carry out the step of macrocellular interference coordination successively carries out low-power access node interference coordination to each low-power access node again to each low-power access node according to first using known statistic channel information, or interference coordination is carried out according to first successively the step of low-power access node interference coordination successively carries out macrocellular interference coordination to each low-power access node again is carried out to each low-power access node；After interference coordination, macrocell base stations only service it remaining user in user's set and service.The present invention have required channel information amount it is small, the low advantage of computation complexity, can flexible setting difference thresholding meet different QoS of customer, be effectively reduced heterogeneous network interlayer interference.
Description
Technical field
The present invention relates to a kind of heterogeneous network downlink transmission systems that uniform planar antenna array is used in macrocell base stations, especially
It is related to a kind of heterogeneous network disturbance coordination method using statistic channel information.
Background technique
With the development of advanced information society, the sharp increase of all kinds of intelligent mobile terminal quantity, to wireless communication system
Transmission rate more stringent requirements are proposed.Cell splitting be it is a kind of it is traditional, it is direct and it is effective improve network capacity method.
Plot area is reduced and is increased new cell base station by this method, is shortened base station at a distance from user, is increased cell density.
However, extending at high cost using macrocell base stations progress network and being limited by space.If by with the small-sized of lower-wattage
Change base station (Small Cell) to be deployed under the coverage area of classical macro-cellular base station, forming has the different of different access nodes
Network forming network will efficiently solve above-mentioned contradiction.Effective supplement of the Small Cell as macrocell base stations, shortens network
At a distance from user, to carry out wireless communication using high band, simultaneously because by the way of disposing with frequency
Increase the reusability of radio resource.The characteristics of minimizing volume simultaneously enables Small Cell flexible deployment in portfolio
Demand compares the hot spot region of concentration, realizes the effect for promoting network capacity and coverage area.Base station deployment at hundred even on
The extensive MIMO (multiple-input multiple-output) of thousand antennas is another raising network transmission speed
With the effective ways of covering.The spatial resolution of extensive MIMO significantly increases compared with existing MIMO, can depth excavated space
Dimension resource allows multiple users in network to utilize the space freedom of extensive MIMO offer on same running time-frequency resource
Degree is communicated simultaneously with base station, to increase substantially spectrum efficiency under conditions of not needing and increasing bandwidth.In addition, big rule
Transmission power can be greatly reduced in mould MIMO, realized by the device of low cost, low-power consumption, really realize green communications.
Wireless communication spectrum efficiency and power efficiency can be substantially improved in extensive MIMO and heterogeneous network, it is considered to be structure
Build the key technology of the following high-effect green mobile communication system.However, in practical applications, extensive mimo wireless communication face
Face numerous challenges, one of them is exactly the antenna amount that can configure of base station by base station space and the shadow of carrier frequency
It rings.In order to overcome limitation of the limited space to extensive mimo wireless communication system, and further digging utilization vertical dimensions
Space resources, there has been proposed the large-scale antenna array in base station configuration two-dimensional grid arrangement, referred to as 3D-MIMO in recent years.
The acquisition of channel information is another challenge that extensive MIMO faces.Existing extensive MIMO transmission scheme is mostly by upper
Line link orthogonal guide frequency and TDD system uplink and downlink channel reciprocity, base station acquisition multi-user's uplink and downlink channel parameter valuation, and with
This implements uplink receiving processing and downlink precoding transmission.However, this scheme be difficult to adapt to high speed mobile communication scene and
FDD system.The statistic behavior information of channel is that approximation is constant within the quite a while, and accuracy is relatively high, is utilized
The transmission plan of statistical channel status information have realize simple, feedback quantity is small, strong robustness, can be suitable for simultaneously TDD and
The advantages of FDD system is the effective ways for overcoming the problems, such as channel information acquisition.In addition, the introducing of Small Cell is being passed
While defeated rate gain, the problem of cross-layer is interfered in heterogeneous network is also brought.When in heterogeneous network in order to increase network
The service quality of handling capacity and network, when being constantly increasing the deployment density of Small Cell, this problem can be more serious
Meeting is so that cause extra energy consumption when network is in the low-load stage.Therefore, it is used for macrocell base stations uniformly flat
The heterogeneous network downlink transmission system of surface antenna battle array explores the disturbance coordination method for utilizing statistical channel status information, to building
Practical extensive MIMO heterogeneous network has important theoretical value and practical significance.
Summary of the invention
Goal of the invention: being directed to the above-mentioned prior art, and the present invention is the isomery that macrocell base stations use uniform planar antenna array
Network downstream Transmission system provides a kind of disturbance coordination method using three-dimensional statistic channel information, can be believed according to statistical channel
Breath measures interlayer interference, and biggish macrocell user will be interfered to be offloaded to low-power access node or collect from macrocellular service user
It is deleted in conjunction, biggish low-power access node power will be interfered to reduce or be set as dormant state, with lower complexity drop
Low interlayer interference improves edge customer rate.
Technical solution: a kind of heterogeneous network downlink interference collaboration method using three-dimensional statistic channel information, heterogeneous network
There are multiple low-power wireless access node share spectrum resources in middle macrocell base stations coverage area；Macrocell base stations are using equal
Even planar array antenna, including MvRow antenna array vertical direction array element, the every row M of horizontal directionhA array element, total transmission power Pm；It is low
Power access node i configurationRoot antenna, total transmission powerIt is up to Ps max, minimum Ps min；Macrocell base stations are first
By the total transmission power of each low-power access nodeIt is initialized as maximum transmission power Ps max, wherein NsIt is different
Low-power wireless access node number in network forming network, by the low-power access node set of suspend modeIt is initialized as empty set, then benefit
The user that each low-power access node and macrocell base stations service on same running time-frequency resource is calculated with three-dimensional statistic channel information
SetIn each user key parameter；Then according to first successively to low-power access node i, i=1 ..., NsCarry out macrocellular
Interference coordination again successively to low-power access node i, i=1 ..., NsThe step of carrying out low-power access node interference coordination, or
According to first successively to low-power access node i, i=1 ..., NsLow-power access node interference coordination is carried out again successively to low function
Rate access node i, i=1 ..., NsThe step of carrying out macrocellular interference coordination carries out interference coordination；It is only right after interference coordination
SetIn remaining macrocell user serviced, will gatherIn low-power access node be disposed as suspend mode shape
State；
The three-dimensional statistic channel information includes: macrocell base stations and macrocell user k, k=1 ..., KmBetween channel it is big
Scale fading factor βm,k, wherein KmFor setMiddle user's number；Macrocell user k, k=1 ..., KmVertical transmission it is related
Battle arrayCorrelation Matrix is sent with levelWherein matrix
Normalization channel matrix between macrocell base stations and user k meetsIts m row n-th
Element [the H of columnm,k]m,nThe channel coefficients between bay and user k arranged for base station m row n-th, subscript ()HIt represents
Conjugate transposition, E { } representative are averaged, and tr { } represents the mark for seeking matrix；Low-power access node i, i=1 ..., NsWith this
The minimum value of the large-scale fading factor of channel between node usersAnd macrocell base stations and low-power access node i, i
=1 ..., NsBetween channel the large-scale fading factorIt is vertical to send Correlation MatrixIt is sent out with level
Send Correlation MatrixWherein matrixFor macrocell base stations and low-power access node
Any user of iBetween normalization channel matrix, m row n-th arrange elementFor base station m
Channel coefficients between the bay that row n-th arranges and the user,It is taken on same running time-frequency resource for low-power access node i
The number of users of business；Low-power access node i, i=1 ..., NsWith macrocell user k, k=1 ..., KmBetween the large scale of channel decline
Fall the factor
The macrocell base stations calculate each low-power access node and set using three-dimensional statistic channel informationIn it is each macro
The key parameter of phone user includes:
1) to setIn macrocell user k, k=1 ..., Km, calculateAndWhereinWithRespectively Mv×MvAnd Mh×MhDFT matrix, m row n-th arrange member
Element is respectivelyWith
2) to setIn macrocell user k, k=1 ..., Km, calculateAndWhereinWithRespectively ΛH,m,kA-th of diagonal element and ΛV,m,kB-th of diagonal element；
3) to low-power access node i, i=1 ..., Ns, calculateAnd
4) to low-power access node i, i=1 ..., Ns, find out respectivelyWithMaximum diagonal elementWithAndWithIn diagonal element withWithRatio is greater than or equal to a certain pre-set threshold delta4Pair
Angle member, is denoted as setWithI.e.Wherein,WithRespectivelyM-th diagonal element andN-th of diagonal element；
The macrocellular interference coordination of the low-power access node i carries out as follows:
A1) if low-power access nodeThen enter step a2)；Otherwise, terminate the macrocellular interference association of the node
It adjusts；
A2) from setIn find out all satisfactionsAndMacrocell user, be denoted as setI.e.SetMiddle number of users is denoted asAnd enable l=1；
A3) if setIn first of macrocell user kl, gather in the service user of macrocell base stationsIn, then it counts
It is average to the interference signal average energy of low-power access node i and each user's useful signal of low-power access node i to calculate it
The ratio between energyOtherwise a8 is entered step)；
A4) if macrocell user klA certain preset is less than or equal to the interference metric values of low-power access node i
Threshold delta1, go to step a8)；Otherwise, by macrocell user klFrom setIn leave out, and enter step a5)；
A5 it) is being not belonging to gatherLow-power access node in find out and macrocell user klBetween channel large scale
The maximum low-power access node of fading factor, is denoted as node r；
A6 macrocell user k) is calculatedlIt is averaged energy by received useful signal under low-power access node r service scenario
It measures and it is by the ratio between useful signal average energy received under macrocell base stations service scenario
A7) if macrocell user klUnloading metric to low-power access node r is greater than or equal to a certain preset
Threshold delta2, then by macrocell user klIt is offloaded to low-power access node r, by the node serve；
A8 l=l+1) is enabled；IfThen go to step a3), the otherwise macrocellular interference coordination of end node i；
The low-power access node interference coordination of the low-power access node i carries out as follows:
B1) if low-power access nodeThen enter step b2)；Otherwise, terminate the low-power access section of the node
Point interference coordination；
B2) to all macrocell usersCalculate low-power access node i to its interference signal average energy with
The ratio between received useful signal average energy
B3) in all macrocell usersIn find outMaximum user is denoted as user ki, i.e.,
B4) ifLess than or equal to a certain pre-set threshold delta3, then terminate the low-power access section of the node
Point interference coordination；Otherwise, by the transmission power of low-power access node iBeing reduced to can satisfyLess than or equal to thresholding
Value δ3Maximum transmission power
B5) if the transmission power of low-power access node iMore than or equal to the minimum transmitting function of low-power access node
Rate Ps min, then terminate the low-power access node interference coordination of the node；Otherwise, low-power access node i is added and is gatheredAnd terminate the low-power access node interference coordination of the node.
Further, step a3 in the macrocellular interference coordination of low-power access node i) in macrocell user klTo low function
The interference signal average energy of rate access node i and the ratio between each user's useful signal average energy of low-power access node iCalculation method are as follows:
Further, step a6 in the macrocellular interference coordination of low-power access node i) macrocell user klBy low-power
Under access node r service scenario received useful signal average energy and its by received under macrocell base stations service scenario
The ratio between useful signal average energyCalculation method be
Further, step b2 in the low-power access node interference coordination of low-power access node i) in low-power access
The ratio between the useful signal average energy that node i receives the interference signal average energy and macrocell user k of macrocell user kCalculation method be
Further, the low-power access node interference coordination step b4 of low-power access node i) in meetIt is less than
Or it is equal to threshold delta3Maximum transmission powerFor
The utility model has the advantages that the present invention is that macrocell base stations are mentioned using the heterogeneous network downlink transmission system of uniform planar antenna array
For a kind of disturbance coordination method using three-dimensional statistic channel information, this method is had the advantages that
1, this method only needs the statistical information of channel, and required channel information amount is small, is suitable for various typical channel radios
Letter system；
2, computation complexities are low, are easily achieved for interlayer interference measurement in this method etc.；
3, this method can meet different use according to the requirement of system and QoS of customer, flexible setting difference thresholding
Family service quality and throughput of system.
Specific embodiment
Method of the invention mainly comprises the steps that
Step 1: by the transmission power of each low-power access nodeIt is initialized as maximum transmission power
Ps max, by the low-power access node set of suspend modeIt is initialized as empty set；
Step 2: carrying out each low-power access node and macrocell base stations in same time-frequency using three-dimensional statistic channel information
The user's set serviced in resourceIn each user key parameter calculating, comprising:
1) to setIn macrocell user k, k=1 ..., Km, calculateAndWherein, KmFor setMiddle user's number,WithRespectively Mv×MvAnd Mh×Mh's
DFT matrix, the element that m row n-th arranges are respectivelyWithMvFor macrocell base stations vertical direction bay line number, MhFor macrocell base stations water
Bay number square into every row,WithIt is respectively macro
The vertical transmission Correlation Matrix of phone user k and horizontal transmission Correlation Matrix, matrixFor macrocell base stations and macrocellular
Normalization channel matrix between user k meetsElement [the H of its m row n-th columnm,k]m,n
The channel coefficients between bay and user k arranged for macrocell base stations m row n-th, subscript ()HRepresent conjugate transposition, E
{ } representative is averaged, and tr { } represents the mark for seeking matrix；
2) to setIn macrocell user k, k=1 ..., Km, calculateAndWhereinWithRespectively ΛH,m,kA-th of diagonal element and ΛV,m,kB-th of diagonal element；
3) to low-power access node i, i=1 ..., Ns, calculateAnd
Wherein,WithRespectively macrocell base stations and low-power access save
The vertical transmission Correlation Matrix of channel and horizontal transmission Correlation Matrix, matrix between point iFor macrocell base stations and low function
Any user of rate access node iBetween normalization channel matrix, m row n-th arrange elementChannel coefficients between the bay arranged for base station m row n-th and the user,Exist for low-power access node i
The number of users serviced on same running time-frequency resource；
4) to low-power access node i, i=1 ..., Ns, find out respectivelyWithMaximum diagonal elementWithThen it finds out respectivelyWithIn diagonal element withWithRatio is greater than or equal to a certain pre-set door
Limit value δ4Diagonal element, be denoted as setWithI.e.
Wherein,WithRespectivelyM-th diagonal element andN-th of diagonal element；
Step 3: according to first successively to low-power access node i, i=1 ..., NsCarry out macrocellular interference coordination again successively
To low-power access node i, i=1 ..., NsThe step of carrying out low-power access node interference coordination, or according to first successively to low
Power access node i, i=1 ..., NsLow-power access node interference coordination is carried out again successively to low-power access node i, i=
1,…,NsThe step of carrying out macrocellular interference coordination carries out interference coordination.
The macrocellular interference coordination of the low-power access node i carries out as follows:
A1) if low-power access nodeThen enter step a2)；Otherwise, terminate the macrocellular interference association of the node
It adjusts；
A2) from setIn find out all satisfactionsAndUser, be denoted as setI.e.SetMiddle number of users is denoted asAnd enable l=1；
A3) if setIn first of macrocell user, it is assumed that be user kl, collect in the service user of macrocell base stations
It closesIn, then its interference signal average energy and low-power access node i to low-power access node i is calculated using following formula
The ratio between each user's useful signal average energy
Wherein, PmFor macrocell base stations total transmission power,The channel between macrocell base stations and low-power access node i
The large-scale fading factor,By low-power access node i and the node service the large-scale fading of channel between user because
The minimum value of son,For the antenna number of low-power access node i configuration；Otherwise a8 is entered step)；
A4) ifGo to step a8)；Otherwise, by macrocell user klFrom setIn leave out, and enter step
Rapid a5)；
A5 it) is being not belonging to gatherLow-power access node in find out and macrocell user klBetween channel large scale
The maximum low-power access node of fading factor, is denoted as node r；
A6) macrocell user k is calculated using following formulalBy received useful letter under low-power access node r service scenario
Number average energy and its by the ratio between useful signal average energy received under macrocell base stations service scenario
Wherein,For the number of users that low-power access node r is serviced on same running time-frequency resource,For low-power access
The antenna number of node r configuration,For the total transmission power of low-power access node r,For low-power access node r with it is macro
Phone user klBetween channel the large-scale fading factor,For macrocell base stations and macrocell user klBetween channel large scale
Fading factor；
A7) ifThen by macrocell user klIt is offloaded to low-power access node r, by the node serve；
A8 l=l+1) is enabled；IfThen go to step a3), otherwise terminate the macrocellular interference coordination of low power nodes i；
The low-power access node interference coordination of the low-power access node i carries out as follows:
B1) if low-power access nodeThen enter step b2)；Otherwise, terminate the low-power access section of the node
Point interference coordination；
B2) to all macrocell usersIt is flat to its interference signal that low-power access node i is calculated using following formula
Equal the ratio between energy and received useful signal average energy
Wherein,The large-scale fading factor of channel, β between low-power access node i and macrocell user km,kIt is macro
The large-scale fading factor of channel between cellular base station and macrocell user k；
B3) in all macrocell usersIn find outMaximum user is denoted as user ki, i.e.,
B4) ifThen terminate the low-power access node interference coordination of the node；Otherwise, low-power is accessed and is saved
The transmission power of point iIt is reduced toWherein
Wherein,For low-power access node i and macrocell user kiBetween channel the large-scale fading factor,For
Macrocell base stations and macrocell user kiBetween channel the large-scale fading factor；
B5) if the transmission power of low-power access node iGreater than the minimum transmission power P of low-power access nodes min,
Then terminate the low-power access node interference coordination of the node；Otherwise, low-power access node i is added and is gatheredAnd terminate
The low-power access node interference coordination of the node.
For the technical solution in the present invention is more clearly understood, this programme is specifically described below:
Consider an isomery downlink transfer network, accesses and save there are multiple low-power wireless in macrocell base stations coverage area
Point share spectrum resources；Macrocell base stations use uniform planar antenna array, including MvRow antenna array vertical direction array element, level side
To every row MhA array element, total transmission power Pm, user that macrocell base stations service on same running time-frequency resource setMiddle use
Amount is Km；Low-power access node i configurationRoot antenna, total transmission powerIt is up to Ps max, minimum Ps min,
The number of users serviced on same running time-frequency resource isAfter the heterogeneous network completes interference coordination, macrocell base stations will be to setIn remaining macrocell user serviced, gatherIn low-power access node will be arranged to dormant state.
Macrocell base stations need the three-dimensional statistic channel information of each macrocell user known and each low-power access node, packet
It includes: macrocell base stations and macrocell user k, k=1 ..., KmBetween channel large-scale fading factor-betam,k；Macrocell user k, k
=1 ..., KmVertical transmission Correlation MatrixCorrelation Matrix is sent with levelWherein matrixNormalization channel between macrocell base stations and user k
Matrix meetsElement [the H of its m row n-th columnm,k]m,nThe day arranged for base station m row n-th
Channel coefficients between linear array member and user k, subscript ()HConjugate transposition is represented, E { } representative is averaged, and tr { } is represented
Seek the mark of matrix；Low-power access node i, i=1 ..., NsThe minimum of the large-scale fading factor of channel between the node users
ValueMacrocell base stations and low-power access node i, i=1 ..., NsBetween channel the large-scale fading factorVertically
Send Correlation MatrixCorrelation Matrix is sent with levelWherein matrixFor any user of macrocell base stations and low-power access node iBetween normalization channel
Matrix, the element that m row n-th arrangesChannel system between the bay arranged for base station m row n-th and the user
Number；Low-power access node i, i=1 ..., NsWith macrocell user k, k=1 ..., KmBetween channel the large-scale fading factor
The specific disturbance coordination method using three-dimensional statistic channel information the following steps are included:
Step 1: each low-power access node is sent powerIt is initialized as maximum transmission power Ps max,
By the low-power access node set of suspend modeIt is initialized as empty set；
Step 2: carrying out each low-power access node and macrocell base stations in same time-frequency using three-dimensional statistic channel information
The user's set serviced in resourceIn each user key parameter calculating, comprising:
1) to setIn macrocell user k, k=1 ..., Km, calculateAndWherein,WithRespectively Mv×MvAnd Mh×MhDFT matrix, m row n-th arrange member
Element is respectivelyWith
2) to setIn macrocell user k, k=1 ..., Km, calculateAndWhereinWithRespectively ΛH,m,kA-th of diagonal element and ΛV,m,kB-th it is diagonal
Member；
3) to low-power access node i, i=1 ..., Ns, calculateAnd
4) to low-power access node i, i=1 ..., Ns, find out respectivelyWithMaximum diagonal elementWithThen it finds out respectivelyWithIn diagonal element withWithRatio is greater than or equal to a certain pre-set door
Limit value δ4Diagonal element, be denoted as setWithI.e.
Wherein,WithRespectivelyM-th diagonal element andN-th of diagonal element；
Step 3: according to first successively to low-power access node i, i=1 ..., NsCarry out macrocellular interference coordination again successively
To low-power access node i, i=1 ..., NsThe step of carrying out low-power access node interference coordination, or according to first successively to low
Power access node i, i=1 ..., NsLow-power access node interference coordination is carried out again successively to low-power access node i, i=
1,…,NsThe step of carrying out macrocellular interference coordination carries out interference coordination.
The macrocellular interference coordination of the low-power access node i carries out as follows:
A1) if low-power access nodeThen enter step a2)；Otherwise, terminate the macrocellular interference association of the node
It adjusts；
A2) from setIn find out all satisfactionsAndUser, be denoted as setI.e.SetMiddle number of users is denoted asAnd enable l=1；
A3) if setIn first of macrocell user, it is assumed that be user kl, collect in the service user of macrocell base stations
It closesIn, then its interference signal average energy and low-power access node i to low-power access node i is calculated using following formula
The ratio between each user's useful signal average energy
Otherwise a8 is entered step)；
A4) ifGo to step a8)；Otherwise, by macrocell user klFrom setIn leave out, and enter step
Rapid a5)；
A5 it) is being not belonging to gatherLow-power access node in find out and macrocell user klBetween the large scale of channel decline
The maximum low-power access node of the factor is fallen, node r is denoted as；
A6) macrocell user k is calculated using following formulalBy received useful letter under low-power access node r service scenario
Number average energy and its by the ratio between useful signal average energy received under macrocell base stations service scenario
A7) ifThen by macrocell user klIt is offloaded to low-power access node r, by the node serve；
A8 l=l+1) is enabled；IfThen go to step a3), otherwise terminate the macrocellular interference coordination of low power nodes i；
The low-power access node interference coordination of the low-power access node i carries out as follows:
B1) if low-power access nodeThen enter step b2)；Otherwise, terminate the low-power access section of the node
Point interference coordination；
B2) to all macrocell usersIt is flat to its interference signal that low-power access node i is calculated using following formula
Equal the ratio between energy and received useful signal average energy
B3) in all macrocell usersIn find outMaximum user is denoted as user ki, i.e.,
B4) ifThen terminate the low-power access node interference coordination of the node；Otherwise, low-power is accessed and is saved
The transmission power of point iIt is reduced toWherein
B5) if the transmission power of low-power access node iGreater than the minimum transmission power P of low-power access nodes min,
Then terminate the low-power access node interference coordination of the node；Otherwise, low-power access node i is added and is gatheredAnd terminate
The low-power access node interference coordination of the node.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (5)
1. a kind of heterogeneous network downlink interference collaboration method using three-dimensional statistic channel information, it is characterised in that: heterogeneous network
There are multiple low-power wireless access node share spectrum resources in middle macrocell base stations coverage area；Macrocell base stations are using equal
Even planar array antenna, including MvRow antenna array vertical direction array element, the every row M of horizontal directionhA array element, total transmission power Pm；It is low
Power access node i configurationRoot antenna, total transmission powerIt is up to Ps max, minimum Ps min；Macrocell base stations are first
By the total transmission power of each low-power access nodeIt is initialized as maximum transmission power Ps max, wherein NsIt is different
Low-power wireless access node number in network forming network, by the low-power access node set of suspend modeIt is initialized as empty set, then benefit
The user that each low-power access node and macrocell base stations service on same running time-frequency resource is calculated with three-dimensional statistic channel information
SetIn each user key parameter；Then according to first successively to low-power access node i, i=1 ..., NsCarry out macrocellular
Interference coordination again successively to low-power access node i, i=1 ..., NsThe step of carrying out low-power access node interference coordination, or
According to first successively to low-power access node i, i=1 ..., NsLow-power access node interference coordination is carried out again successively to low function
Rate access node i, i=1 ..., NsThe step of carrying out macrocellular interference coordination carries out interference coordination；It is only right after interference coordination
SetIn remaining macrocell user serviced, will gatherIn low-power access node be disposed as suspend mode shape
State；
The three-dimensional statistic channel information includes: macrocell base stations and macrocell user k, k=1 ..., KmBetween channel large scale
Fading factor βm,k, wherein KmFor setMiddle user's number；Macrocell user k, k=1 ..., KmVertical transmission Correlation MatrixCorrelation Matrix is sent with levelWherein matrixFor
Normalization channel matrix between macrocell base stations and user k meetsIts m row n-th column
Element [Hm,k]m,nThe channel coefficients between bay and user k arranged for base station m row n-th, subscript ()HIt represents altogether
Yoke transposition, E { } representative are averaged, and tr { } represents the mark for seeking matrix；Low-power access node i, i=1 ..., NsWith the section
The minimum value of the large-scale fading factor of channel between point userAnd macrocell base stations and low-power access node i, i=
1,…,NsBetween channel the large-scale fading factorIt is vertical to send Correlation MatrixIt is sent with level
Correlation MatrixWherein matrixIt is macrocell base stations with low-power access node i's
Any user j,Between normalization channel matrix, m row n-th arrange elementFor base station m row
Channel coefficients between the bay and the user of n-th column,It is serviced on same running time-frequency resource for low-power access node i
Number of users；Low-power access node i, i=1 ..., NsWith macrocell user k, k=1 ..., KmBetween channel large-scale fading
The factor
The macrocell base stations calculate each low-power access node and set using three-dimensional statistic channel informationIn each macrocellular
The key parameter of user includes:
1) to setIn macrocell user k, k=1 ..., Km, calculateAndWhereinWithRespectively Mv×MvAnd Mh×MhDFT matrix, m row n-th arrange member
Element is respectivelyWith
2) to setIn macrocell user k, k=1 ..., Km, calculateAndWhereinWithRespectively ΛH,m,kA-th of diagonal element and ΛV,m,kB-th of diagonal element；
3) to low-power access node i, i=1 ..., Ns, calculateAnd
4) to low-power access node i, i=1 ..., Ns, find out respectivelyWithMaximum diagonal elementWithAndWithIn diagonal element withWithRatio is greater than or equal to a certain pre-set threshold delta4Diagonal element, note
For setWithI.e.Wherein,WithRespectivelyM-th diagonal element andN-th of diagonal element；
The macrocellular interference coordination of the low-power access node i carries out as follows:
A1) if low-power access nodeThen enter step a2)；Otherwise, terminate the macrocellular interference coordination of the node；
A2) from setIn find out all satisfactionsAndMacrocell user, be denoted as setI.e.SetMiddle number of users is denoted asAnd enable l=1；
A3) if setIn first of macrocell user kl, gather in the service user of macrocell base stationsIn, then calculate it
Each user's useful signal average energy of interference signal average energy and low-power access node i to low-power access node i
The ratio betweenOtherwise a8 is entered step)；
A4) if macrocell user klA certain pre-set thresholding is less than or equal to the interference metric values of low-power access node i
Value δ1, go to step a8)；Otherwise, by macrocell user klFrom setIn leave out, and enter step a5)；
A5 it) is being not belonging to gatherLow-power access node in find out and macrocell user klBetween channel large-scale fading because
The maximum low-power access node of son, is denoted as node r；
A6 macrocell user k) is calculatedlBy received useful signal average energy under low-power access node r service scenario and its
By the ratio between useful signal average energy received under macrocell base stations service scenario
A7) if macrocell user klUnloading metric to low-power access node r is greater than or equal to a certain pre-set thresholding
Value δ2, then by macrocell user klIt is offloaded to low-power access node r, by the node serve；
A8 l=l+1) is enabled；IfThen go to step a3), the otherwise macrocellular interference coordination of end node i；
The low-power access node interference coordination of the low-power access node i carries out as follows:
B1) if low-power access nodeThen enter step b2)；Otherwise, the low-power access node for terminating the node is dry
Disturb coordination；
B2) to all macrocell usersLow-power access node i is calculated to connect its interference signal average energy with it
The ratio between useful signal average energy received
B3) in all macrocell usersIn find outMaximum user is denoted as user ki, i.e.,
B4) ifLess than or equal to a certain pre-set threshold delta3, then terminate the low-power access node interference of the node
Coordinate；Otherwise, by the transmission power of low-power access node iBeing reduced to can satisfyLess than or equal to threshold delta3's
Maximum transmission power
B5) if the transmission power of low-power access node iMore than or equal to the minimum transmission power of low-power access node
Ps min, then terminate the low-power access node interference coordination of the node；Otherwise, low-power access node i is added and is gathered
And terminate the low-power access node interference coordination of the node.
2. the heterogeneous network downlink interference collaboration method according to claim 1 using three-dimensional statistic channel information, special
Sign is: step a3 in the macrocellular interference coordination of low-power access node i) in macrocell user klTo low-power access node
The interference signal average energy of i and the ratio between each user's useful signal average energy of low-power access node iCalculating side
Method are as follows:
Wherein,For the number of users that low-power access node i is serviced on same running time-frequency resource,WithRespectivelyTheA diagonal element and?A diagonal element.
3. the heterogeneous network downlink interference collaboration method according to claim 1 using three-dimensional statistic channel information, special
Sign is: step a6 in the macrocellular interference coordination of low-power access node i) macrocell user klBy low-power access node r
Under service scenario received useful signal average energy and its by received useful signal under macrocell base stations service scenario
The ratio between average energyCalculation method be
Wherein,For the number of users that low-power access node r is serviced on same running time-frequency resource,WithRespectively?A diagonal element and?A diagonal element.
4. the heterogeneous network downlink interference collaboration method according to claim 1 using three-dimensional statistic channel information, special
Sign is: step b2 in the low-power access node interference coordination of low-power access node i) in low-power access node i to macro
The ratio between the useful signal average energy that the interference signal average energy and macrocell user k of phone user k receivesMeter
Calculation method is
Wherein,WithRespectively ΛH,m,kHkA diagonal element and ΛV,m,kVkA diagonal element.
5. the heterogeneous network downlink interference collaboration method according to claim 1 using three-dimensional statistic channel information, special
Sign is: the low-power access node interference coordination step b4 of low-power access node i) in meetLess than or equal to thresholding
Value δ3Maximum transmission powerFor
Wherein,WithRespectively?A diagonal element and?A diagonal element.
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