CN103716079B - Method and apparatus for coordinated multipoint downlink transmission between two cells - Google Patents
Method and apparatus for coordinated multipoint downlink transmission between two cells Download PDFInfo
- Publication number
- CN103716079B CN103716079B CN201210376884.1A CN201210376884A CN103716079B CN 103716079 B CN103716079 B CN 103716079B CN 201210376884 A CN201210376884 A CN 201210376884A CN 103716079 B CN103716079 B CN 103716079B
- Authority
- CN
- China
- Prior art keywords
- vector
- user equipment
- community
- user
- base station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H04B7/022—Site diversity; Macro-diversity
-
- 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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
-
- 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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
- H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
- H04J11/0033—Interference mitigation or co-ordination of multi-user interference at the transmitter by pre-cancellation of known interference, e.g. using a matched filter, dirty paper coder or Thomlinson-Harashima precoder
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a method and apparatus for coordinated multipoint downlink transmission between two cells. A reference vector is determined in base stations of all cells; channel vectors of all user equipment in cells are obtained, wherein the channel vectors express effective downlink channels when receiving vectors are used to enable interferences from other base stations to be aligned at the reference vector; one or more user equipment is selected according to the reference vector, the channel vectors and a preset scheduling criterion; and according to the reference vector, the channel vectors and a preset beam forming criterion, precoding vectors for downlink transmission of the selected one or more user equipment are determined. Therefore, the interferences from other base stations can be aligned at the reference vector and a desired signal can be arranged at a spatial dimension different from the reference vector, so that the inter cell interference can be reduced and all the base stations can implement multi-user scheduling and sending terminal beam forming independently and thus the multi-user diversity gain and the beam forming gain can be obtained effectively.
Description
Technical field
The present invention relates to cordless communication network, more particularly, to minizone coordinate multipoint downlink transfer technology.
Background technology
MIMO technique (Multiple Input Multiple Output, MIMO) because its need not be extra band
Wide or transmit power just can dramatically increase data throughout and improve link reliability and attracted extensive concern.MIMO technology
Adopted by many wireless communication standards, such as IEEE 802.11n, 3GPP-LTE (the 3rdGeneration
Partnership ProjectLong Term Evolution) and WiMAX (Worldwide Interoperability
ForMicrowave Access) etc..In conventional cellular systems, each user equipment (UserEquipement, UE) receives
The interference of the base station from the desired signal of its serving BS (Base Station, BS) and in neighbor cell, this kind of dry
Disturb and be referred to as presence of intercell interference (inter cell interference, ICI).Therefore, the downlink of conventional cellular systems
Capacity is limited by ICI interference level.As a kind of distributed MIMO technology, coordinate multipoint (Coordinated
Multipoint, CoMP) scheme can mitigate ICI by the cooperation of multiple base stations.
Downlink CoMP transmission scheme is broadly divided into two classes：Joint transmission (jointtransmission, JT) and cooperation
Scheduling/cooperative beam figuration (coordinatedscheduling/beam-forming, CS/CB).In joint transmission scheme,
User profile is shared in base station in same CoMP cluster, including channel condition information (Channel StateInformation,
) and user data CSI.Although joint transmission scheme is capable of higher performance improving, there is also many problems, such as
Higher backbone network (backhaul) for exchanging channel condition information and user data requires, user scheduling and transmission prelist
The higher computation complexity that code design is brought and the synchronization between the base station in same CoMP cluster etc..In contrast,
CS/CB scheme because its need not between the base station in same CoMP cluster exchanging user data and the requirement to backbone network can be reduced.
Recently, for Single User MIMO system, that is, the situation for only one of which user in each cell is it is proposed that disturb
Alignment (Interference Alignment, IA).Interference alignment refers in the case of known channel matrix, by transmitting terminal
Precoding, the desired signal of each receiving terminal and interference signal are spatially separated from.For example, the interference of each receiving terminal is limited
System is in the part in receipt signal space, and the other parts in receipt signal space are left for desired signal.Interference alignment tool
Have the advantages that complexity is low, performance is good.
However, in actual mimo system, having multiple users in each cell, and base station generally adopts multi-user
MIMO rather than Single User MIMO are to service multiple users simultaneously.Further, since the quantity of user that base station services is subject to base simultaneously
The restriction of station antenna quantity, therefore base station can only service a part of user on a running time-frequency resource.In other words, base station needs to apply
Row user scheduling selects a part of user to service with each.Thus, existing interference alignment can not be directly applied for reality
The multi-user MIMO system on border.
Content of the invention
For above-mentioned technical problem, it is an object of the invention to provide a kind of cooperative scheduling/cooperation based on interference alignment
Beamforming scheme, to realize interference alignment and cooperative scheduling/cooperative beam figuration in multi-user MIMO system, thus not
Only effectively reduce presence of intercell interference additionally it is possible to obtain multi-user diversity gain and beam forming gain.
In the solution of the present invention, in the base station in each cell, determine a reference vector；Obtain each user in cell
The channel vector of equipment, it represents that the interference from other base stations snaps to the effective when receiving vectorial of reference vector using order
Down channel；One or more user equipmenies are selected according to reference vector, channel vector and predetermined dispatching criterion；According to ginseng
Examine vector, channel vector and predetermined wave beam forming criterion, determine in selected one or more user equipmenies
The precoding vector of the downlink transfer of each.
Thereby, it is possible to the interference from other base stations being snapped to the first reference vector and being placed on not desired signal
It is same as on the Spatial Dimension of the first reference vector, that is, so that interference and desired signal are spatially separated from, this can not only reduce
Presence of intercell interference, also enables each base station independently to implement multi-subscriber dispatching and transmitting terminal wave beam forming, successfully will
Multiple cell multi-subscriber dispatching be reduced to single cell multi-subscriber dispatching such that it is able to need not be higher complexity be just obtained in that multiplex
Family diversity gain and beam forming gain.
In one example, each cell will share same reference vector；In another example, determined by each cell
Reference vector can be different.
According to an aspect of the invention, it is provided it is little to be used for described first in a kind of first base station in first community
The method of the coordinate multipoint downlink transfer between area and second community, second in wherein said first base station and described second community
Base station is equipped with multiple antennas.The method comprising the steps of：A. determine the first reference vector；B. obtain corresponding to described
First channel vector of each of the multiple user equipmenies in first community user, described first channel vector represents corresponding
Effective down channel when receiving vector using first for the user equipment, described first reception vector is according to will be from described
The interference of the second base station snaps to the interference alignment criterion of described first reference vector and determines；C. according to described first reference
Described first channel vector of the plurality of user equipment in vectorial, described first community and predetermined scheduling are accurate
Then, one or more user equipmenies are selected from the plurality of user equipment in described first community；And D. is according to described
First reference vector, described first channel vector of selected one or more user equipmenies and predetermined wave beam
Figuration criterion, determines that first of the downlink transfer for each of described selected one or more user equipmenies prelists
Code vector.
According to a specific embodiment of the present invention, described first reference vector is the plurality of in described first community
The right side of the down channel matrix of one of the multiple user equipmenies in user equipment and described second community user equipment is unusual
Vector.In one example, a user equipment can be randomly selected, and by the down channel matrix of this user equipment
Big right singular vector corresponding to singular value is as the first reference vector.In another example, as described first with reference to
The singular value corresponding to right singular vector of amount can be the plurality of user equipment and described second in described first community
Maximum in the singular value of down channel matrix of all user equipmenies in the plurality of user equipment in cell.
According to a specific embodiment of the present invention, methods described includes in described step A：A1. determine described first
Maximum singular value in the singular value of down channel matrix of all user equipmenies in the plurality of user equipment in cell
And corresponding right singular vector, and send it to described second base station；A2. receive described second from described second base station little
In the singular value of down channel matrix of all user equipmenies in the plurality of user equipment in area maximum singular value with
And corresponding right singular vector；And A3. according to determined by described singular value and corresponding right singular vector and connect
The described singular value received and corresponding right singular vector, determine described first reference vector.
According to a specific embodiment of the present invention, described interference alignment criterion can be represented with equation below：
Wherein, brefRepresent described first reference vector, w[i, j]Represent in the described user equipment of described first community j
The first reception vector of user equipment i,Represent the described second base station extremely described first community in described second community 3-j
The down channel matrix of the described user equipment i of j.As can be seen here, each user equipment is so designed that reception vector will to be derived from
The interference of other cells snaps on the direction of the first reference vector.
According to the present invention, the first of the efficient channel representing each user equipment can be obtained in stepb in many ways
Channel vector.
According to a specific embodiment of the present invention, methods described includes in described step B：B11. obtain this user to set
Standby down channel matrix and described second base station to this user equipment interference down channel matrix；And B12. is according to institute
State the first reference vector, acquired down channel matrix, acquired interference down channel matrix, determine this user equipment
Described first channel vector.For example, channel by channel reciprocity (channelreciprocity) or can be passed through in base station
Feed back (channel feedback) and obtain down channel matrix and the interference down channel matrix of user equipment.
According to another specific embodiment of the present invention, methods described includes in described step B：B21. to described first
The plurality of user equipment of cell sends described first reference vector；And B22. is from the plurality of use of described first community
Each of family equipment receives described first channel vector of this user equipment.Correspondingly, each user equipment is receiving arrival
From after described first reference vector of base station, down channel matrix according to itself and interference down channel matrix, determine the
One channel vector simultaneously sends it to base station.Compared to down channel matrix and the interference down channel matrix of user equipment, the
The quantity of information of one reference vector and the first channel vector is less, and this is advantageous for channel feedback.
According to a specific embodiment of the present invention, in described step C, using iteration zero forcing algorithm, from described first
One or more of user equipmenies are selected in the plurality of user equipment in cell.
According to a specific embodiment of the present invention, described dispatching criterion be maximum rate scheduling, proportional fairness dispatch,
Or polling dispatching.
According to a specific embodiment of the present invention, described wave beam forming criterion is ZF or least mean-square error.
According to another aspect of the present invention, there is provided in a kind of first base station in first community, be used for described first
The device of the coordinate multipoint downlink transfer between cell and second community, in wherein said first base station and described second community
Two base stations are equipped with multiple antennas, and described device includes：First determining unit, it obtains the first reference vector；Acquiring unit,
Its obtain corresponding to each of the multiple user equipmenies in described first community user the first channel vector, described first
Channel vector represents effective down channel when receiving vector using first for the corresponding user equipment, and described first receives vector
It is to be determined according to the interference alignment criterion that the interference from described second base station is snapped to described first reference vector；Choosing
Select unit, it is according to described first channel of the plurality of user equipment in described first reference vector, described first community
Vector and predetermined dispatching criterion, select one or many from the plurality of user equipment in described first community
Individual user equipment；And second determining unit, it is according to described first reference vector, selected one or more user equipmenies
Described first channel vector and predetermined wave beam forming criterion, determine for described selected one or more
First precoding vector of the downlink transfer of each of user equipment.
Brief description
Read the following detailed description to non-limiting example by referring to accompanying drawing, the present invention's is other special
Levy, objects and advantages will become more apparent upon.
Fig. 1 shows the schematic diagram of two cell cooperative downlink transfer；
Fig. 2 shows the flow process of the method for coordinate multipoint downlink transfer of a specific embodiment according to the present invention
Figure；
Fig. 3 shows the frame of the device for coordinate multipoint downlink transfer of a specific embodiment according to the present invention
Figure.
Specific embodiment
Fig. 1 shows the schematic diagram of two cell cooperative downlink transfer.In general, two cells of coordination downlink transmission are carried out
It is adjacent cell.As shown in figure 1, cell 110 is adjacent with cell 120, the downlink transfer in this two cell is mutually produced to other side
Raw interference.Cell 110 includes base station 130 and multiple user equipment, such as user equipment 151 and 152, wherein base station 130
Strengthen node B (enhanced Node B, eNB) in this way.Similarly, cell 120 includes base station 140 and multiple user equipment,
Such as user equipment 153 and 154.Additionally, base station 130 and base station 140 are equipped with multiple antennas, each user equipment is also equipped with
Multiple antennas.
In this, it is assumed that base station 130 and base station 140 are equipped with M antenna, each user equipment is equipped with N number of antenna.It is worth
It is to be noted that although it is assumed herein that the antenna number provisioned in two base stations is identical and each user equipment provisioned in antenna number also phase
With it should be appreciated to those skilled in the art that the method according to the invention and device can also apply to two base stations and each
User equipment is equipped with the situation of the antenna of varying number.It is furthermore assumed that each cell comprises K user equipment.This area
Technical staff it is also understood that, in real system the quantity of the user equipment that each cell comprises be often different and meeting
Change over, and methods and apparatus of the present invention is also applied for such situation.
Hereinafter, by base station j, the down channel matrix of the user equipment i in this cell is labeled asBy another base
The interference down channel matrix of 3-j to this user equipment i of standing is labeled asAs shown in figure 1, in cell 110 (i.e. cell 1)
Each user equipment is serviced by base station 130, and the down channel matrix of the K user equipment in its place cell 110 for the base station 130 divides
It is notMeanwhile, the downstream signal of base station 140 can interfere to each user equipment in cell 110, base station
The interference down channel matrix of the 140 K user equipmenies in cell 110 isSimilarly, cell 120 is (i.e.
Cell 2) in each user equipment serviced by base station 140, K user equipment Dao its place cell 120 in for the base station 140 descending
Channel matrix is respectivelyMeanwhile, the downstream signal of base station 130 can be made to each user equipment in cell 120
Become interference, the interference down channel matrix of the K user equipment in cell 120 for the base station 130 is
Fig. 2 shows the flow process of the method for coordinate multipoint downlink transfer of a specific embodiment according to the present invention
Figure；Fig. 3 shows the block diagram of the device for coordinate multipoint downlink transfer of a specific embodiment according to the present invention.Each
It is designed with the device 300 for coordinate multipoint downlink transfer in base station.As shown in figure 3, device 300 includes the first determining unit
310th, acquiring unit 320, select unit 330 and the second determining unit 340..
With reference to Fig. 2 and Fig. 3, in step S210, the first determining unit 310 determines the first reference vector bref.
According to a specific embodiment of the present invention, the first reference vector is K user equipment and cell in cell 110
The right singular vector of the down channel matrix of one of K user equipment in 120 user equipment.
In one example, randomly choose a user equipment, and by the down channel matrix of this user equipment
Big right singular vector corresponding to singular value (i.e. the 1st singular value) is as the first reference vector.Specifically, if selected for little
User equipment i in area j, and the down channel of this user equipmentSingular value decomposition (the singular of choosing
Valuedecomposition, SVD) be
Then will be used for disturbing the first reference vector of alignment to be defined as
In another example, so determine the first reference vector so that the right side as described first reference vector is unusual
Singular value corresponding to vector be all user equipmenies the singular value of down channel matrix in maximum.Specifically, according to
Lower formula determines the first reference vector bref：
Wherein,Represent m-th singular value of the user equipment i in cell j.
According to a specific embodiment of the present invention, above-mentioned steps S210 include：Determine described in described first community
Maximum singular value and the corresponding right side in the singular value of down channel matrix of all user equipmenies in multiple user equipmenies
Singular vector, and send it to described second base station；Receive the plurality of in described second community from described second base station
In the singular value of down channel matrix of all user equipmenies in user equipment, maximum singular value and the corresponding right side are unusual
Vector；And according to determined by described singular value and corresponding right singular vector and the described singular value that received with
And corresponding right singular vector, by described first reference vector be defined as determined by described singular value and received described strange
That larger corresponding right singular vector in different value.
In other words, first, each base station is found out in the singular value of down channel matrix of all user equipmenies of this cell
Maximum that and corresponding singular vector, and send it to another base station；Secondly, each base station is little by comparing this
Maximum singular value in the singular value of down channel matrix of all user equipmenies in area and from another base station received strange
Different value (maximum singular value in the singular value of the down channel matrix of its all user equipment for another cell) and find two
That of maximum in the singular value of down channel matrix of all user equipmenies in individual cell.
By this way, each base station only needs to know the down channel matrix of the user equipment in this cell, and need not
Know the down channel matrix of the user equipment in another cell.
With continued reference to Fig. 2 and Fig. 3, in step S220, acquiring unit 320 obtains corresponding to many in described first community
First channel vector of each of individual user equipment user, described first channel vector represents that corresponding user equipment makes
Receive effective down channel during vector with first, described first reception vector is according to by the interference from described second base station
Snap to the interference alignment criterion of described first reference vector and determine.
It should be noted that each user equipment actually might not receive vector using first receiving from base station
Desired signal.User equipment can independently design it with the first reception vector and receive vector, such as pass through ZF (zero-
Forcing), maximum-ratio combing (maximum (maximum ratio combining) or least mean-square error (minimum
Mean squareerror, MMSE) etc. mode.
According to a specific embodiment of the present invention, described interference alignment criterion is represented with equation below：
Wherein w[i,j]Represent the first reception vector of the user equipment i in cell j.
Determining that first receives vectorial w[i, j]Afterwards, can be identified below represent effective down channel the first channel to
Amount：
WhereinRepresent first channel vector of the user equipment i in cell j.
According to a specific embodiment of the present invention, the first reception of the user equipment in this cell can be determined by base station
Vector, then determine the first channel vector.According to a specific embodiment of the present invention, each can be determined certainly by user equipment
First reception of body is vectorial, then determine the first channel vector.
In the case of being determined by base station, step S220 includes：For described first community, (such as cell j's) is described many
Each of individual user equipment user equipment, (for example base station j) obtains the down channel of this user equipment to described first base station
MatrixAnd described second base station (such as base station 3-j) is to the interference down channel matrix of this user equipmentAnd
According to described first reference vector bref, and acquired interference down channel matrixDetermine the first reception vector w[i , j], then according to acquired down channel matrixAnd determined by first receive vectorial w[i, j], determine that this user sets
The first standby channel vector
In the case of being determined by user equipment, step S220 includes：(such as base station j) is to described for described first base station
(the plurality of user equipment of such as cell j) sends described first reference vector b to one cellref；And from described first community
Each of the plurality of user equipment receive described first channel vector of this user equipment.Correspondingly, in cell j
User equipment i is receiving described first reference vector b from base station jrefAfterwards, according to the first reference vector being received
bref, and its disturb down channel matrixDetermine the first reception vector w[i, j], then according to its down channel matrixAnd determined by the one one receive vectorial w[i, j], determine its first channel vectorAnd by this first channel to
Amount is sent to base station j.
With continued reference to Fig. 2 and Fig. 3, in step S230, select unit 330 according to described first reference vector, described
First channel vector of the plurality of user equipment in one cell and predetermined dispatching criterion are little from described first
One or more user equipmenies are selected in the plurality of user equipment in area.
According to a specific embodiment of the present invention, in above-mentioned steps S230, using iteration zero forcing algorithm, from described
One or more of user equipmenies are selected in the plurality of user equipment in one cell.Additionally, described dispatching criterion is
Big speed (maximum rate) scheduling, proportional fairness (proportional fairness) scheduling or poll (round
Robin) scheduling etc..
Taking maximum rate scheduling as a example illustrate below base station how using iteration break zero algorithm from this cell in many
One or more user equipmenies are selected, selected one or more user equipmenies are constituted for downlink transfer in individual user equipment
A user equipment subset.Iteration is broken zero algorithm and is included three phases：
1) initialize, orderAnd(will user equipment subset initial
Turn to sky), whereinIndex for illusory user equipment；
2) in the 1st iteration (i.e. i=1), select illusory user equipment as first user equipment selected,
And update user equipment subset, matrix as followsQ1And maximum rate C1：
Csum=log2(1+Pτ)
Wherein τ is the norm squared of the first reference vector, that is, τ=| | bref||2；
3) for iteration afterwards, i.e. i=2：M
A) for each l ∈ ΩS, carry out following process：
1. makeFollowing renewal matrixQ1
Wherein, rI, i=| | qi||；
2. calculate corresponding maximum rate, ifThen
B) according to maximum rate dispatching criterion, find out the user equipment treating selection, that is,
vi=arg max { Ci(l), l ∈ ΩC}
Ci=max { Ci(l), l ∈ ΩC}
If c) Ci≤Csum, algorithm terminates, and otherwise, updates user equipment subset, matrix as followsQiAnd it is maximum fast
Rate Ci：
ΩS=ΩS∪{vi, ΩC=ΩC\{vi, Csum=Ci.
With continued reference to Fig. 2 and Fig. 3, in step S240, the second determining unit 340 is according to described first reference vector, institute
Described first channel vector of one or more user equipmenies selecting and predetermined wave beam forming criterion, determine and use
The first precoding vector in the downlink transfer of each of described selected one or more user equipmenies.
For example, described wave beam forming criterion can be ZF (zero-forcing), can be determined with equation below and use
Precoding vector in wave beam forming：
Wherein t[i, j]It is the precoding vector of the downlink transfer for the user equipment i in cell j, α[i, j]It is normalization
The factor with normalization precoding vector, that is, so that | | t[i, j]||2=1, symbolRepresent pseudoinverse (pseudo inverse).
Alternatively, described wave beam forming criterion can also be least mean-square error.
Those skilled in the art will be understood that above-described embodiment is all illustrative and not restrictive.In different embodiments
The different technologies feature of middle appearance can be combined, to obtain beneficial effect.Those skilled in the art are in studying accompanying drawing, explanation
On the basis of book and claims, will be understood that and realize the embodiment of other changes of disclosed embodiment.In right
In claim, term " inclusion " is not precluded from other devices or step；Indefinite article " one " is not excluded for multiple；Term " the
One ", " second " is used for indicating title not for any specific order of expression.Any reference in claim is all not
Should be understood limiting of its scope.Some technical characteristics occur in different dependent claims and are not meant to not
These technical characteristics can be combined to obtain beneficial effect.
Claims (10)
1. the coordinate multipoint being used between described first community and second community in a kind of first base station in first community is descending
The method of transmission, the second base station in wherein said first base station and described second community is equipped with multiple antennas, described side
Method comprises the following steps：
A. determine the first reference vector, wherein said first reference vector is the plurality of user equipment in described first community
Institute is right with the maximum singular value of the down channel matrix of one of the multiple user equipmenies in described second community user equipment
The right singular vector answered；
B. obtain the first channel vector corresponding to each of the multiple user equipmenies in described first community user, described
First channel vector represents effective down channel when receiving vector using first for the corresponding user equipment, described first reception
Vector is to be determined according to the interference alignment criterion that the interference from described second base station snaps to described first reference vector
's；
C. described first channel according to the plurality of user equipment in described first reference vector, described first community to
Amount and predetermined dispatching criterion, select one or more from the plurality of user equipment in described first community
User equipment；And
D. according to described first reference vector, described first channel vector of selected one or more user equipmenies and
Predetermined wave beam forming criterion, determines descending for each of described selected one or more user equipmenies
First precoding vector of transmission.
2. method according to claim 1 is it is characterised in that the right singular vector institute as described first reference vector is right
The singular value answered is that the plurality of user in the plurality of user equipment and described second community in described first community sets
Maximum in the singular value of down channel matrix of all user equipmenies in standby.
3. method according to claim 2 is it is characterised in that include in described step A：
A1. determine the strange of the down channel matrix of all user equipmenies in the plurality of user equipment in described first community
Maximum singular value and corresponding right singular vector in different value, and send it to described second base station；
A2. receive under all user equipmenies the plurality of user equipment in described second community from described second base station
Maximum singular value and corresponding right singular vector in the singular value of row channel matrix；And
A3. according to determined by described singular value and corresponding right singular vector and the described singular value being received and
Corresponding right singular vector, determines described first reference vector.
4. method according to claim 1 is it is characterised in that described interference alignment criterion is represented with equation below：
Wherein, brefRepresent described first reference vector, w[i,j]Represent in the plurality of user equipment of described first community j
The first reception vector of user equipment i,Represent that described second base station in described second community 3-j is little to described first
The down channel matrix of the described user equipment i of area j.
5. method according to claim 1 is it is characterised in that include in described step B：For described first community
Each of the plurality of user equipment user equipment,
B11. the down channel matrix of this user equipment and described second base station are obtained to the descending letter of interference of this user equipment
Road matrix；And
B12. according to described first reference vector, acquired down channel matrix, acquired interference down channel matrix, really
Described first channel vector of this user equipment fixed.
6. method according to claim 1 is it is characterised in that include in described step B：
B21. send described first reference vector to the plurality of user equipment of described first community；And
B22. described first letter of this user equipment is received from each of the plurality of user equipment of described first community
Road vector.
7. method according to claim 1 is it is characterised in that in described step C, using iteration zero forcing algorithm, from institute
State in the plurality of user equipment in first community and select one or more of user equipmenies.
8. method according to claim 1 is it is characterised in that described dispatching criterion is maximum rate scheduling, equitable proportion
Property scheduling or polling dispatching.
9. method according to claim 1 is it is characterised in that described wave beam forming criterion is ZF or lowest mean square misses
Difference.
10. the coordinate multipoint being used between described first community and second community in a kind of first base station in first community is descending
The device of transmission, the second base station in wherein said first base station and described second community is equipped with multiple antennas, described dress
Put including：
- the first determining unit, it determines the first reference vector, and wherein said first reference vector is the institute in described first community
State one of multiple user equipmenies in the multiple user equipmenies and described second community down channel matrix of user equipment
Right singular vector corresponding to maximum singular value；
- acquiring unit, it obtains the first letter corresponding to each of the multiple user equipmenies in described first community user
Road vector, described first channel vector represents effective down channel when receiving vector using first for the corresponding user equipment,
Described first reception vector is right according to the interference that the interference from described second base station snaps to described first reference vector
Neat criterion and determine；
- select unit, it is according to described of the plurality of user equipment in described first reference vector, described first community
One channel vector and predetermined dispatching criterion, select one from the plurality of user equipment in described first community
Individual or multiple user equipmenies；And
- the second determining unit, its according to described first reference vector, selected one or more user equipmenies described first
Channel vector and predetermined wave beam forming criterion, determine in described selected one or more user equipmenies
The downlink transfer of each the first precoding vector.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210376884.1A CN103716079B (en) | 2012-09-28 | 2012-09-28 | Method and apparatus for coordinated multipoint downlink transmission between two cells |
| PCT/IB2013/002095 WO2014049416A2 (en) | 2012-09-28 | 2013-09-02 | Method and apparatus for coordinated multipoint downlink transmission between two cells |
| TW102132424A TW201424290A (en) | 2012-09-28 | 2013-09-09 | Method and apparatus for coordinated multipoint downlink transmission between two cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210376884.1A CN103716079B (en) | 2012-09-28 | 2012-09-28 | Method and apparatus for coordinated multipoint downlink transmission between two cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103716079A CN103716079A (en) | 2014-04-09 |
| CN103716079B true CN103716079B (en) | 2017-02-15 |
Family
ID=49725156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210376884.1A Active CN103716079B (en) | 2012-09-28 | 2012-09-28 | Method and apparatus for coordinated multipoint downlink transmission between two cells |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103716079B (en) |
| TW (1) | TW201424290A (en) |
| WO (1) | WO2014049416A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104394572A (en) * | 2014-11-13 | 2015-03-04 | 北京邮电大学 | Beam forming and interference aligning relay transmission device based on optimal relay selection |
| CN105790804B (en) * | 2016-01-29 | 2018-06-26 | 西安交通大学 | A kind of double cell cooperative force zero method for precoding based on local channel correlation |
| US10110357B2 (en) | 2016-11-03 | 2018-10-23 | Industrial Technology Research Institute | Cooperative communication method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010085092A3 (en) * | 2009-01-22 | 2010-10-28 | Lg Electronics Inc. | Method and apparatus of transmitting data in coordinated multi-cell wireless communication system |
| WO2011078571A2 (en) * | 2009-12-22 | 2011-06-30 | 엘지전자 주식회사 | Apparatus for performing comp communication using a precoded sounding reference signal, and method for same |
| WO2012104676A1 (en) * | 2011-02-01 | 2012-08-09 | Research In Motion Limited | Mixed rank downlink multi-user interference alignment scheme |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101587563B1 (en) * | 2009-09-01 | 2016-02-02 | 삼성전자주식회사 | Communication system and method of performing interference alignment |
-
2012
- 2012-09-28 CN CN201210376884.1A patent/CN103716079B/en active Active
-
2013
- 2013-09-02 WO PCT/IB2013/002095 patent/WO2014049416A2/en active Application Filing
- 2013-09-09 TW TW102132424A patent/TW201424290A/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010085092A3 (en) * | 2009-01-22 | 2010-10-28 | Lg Electronics Inc. | Method and apparatus of transmitting data in coordinated multi-cell wireless communication system |
| WO2011078571A2 (en) * | 2009-12-22 | 2011-06-30 | 엘지전자 주식회사 | Apparatus for performing comp communication using a precoded sounding reference signal, and method for same |
| WO2012104676A1 (en) * | 2011-02-01 | 2012-08-09 | Research In Motion Limited | Mixed rank downlink multi-user interference alignment scheme |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103716079A (en) | 2014-04-09 |
| TW201424290A (en) | 2014-06-16 |
| WO2014049416A2 (en) | 2014-04-03 |
| WO2014049416A3 (en) | 2014-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2314116B1 (en) | Method of joint resource allocation and clustering of base stations | |
| Zhang et al. | Cochannel interference mitigation and cooperative processing in downlink multicell multiuser MIMO networks | |
| Jang et al. | CoMP-CSB for ICI nulling with user selection | |
| CN105723627B (en) | Method and apparatus for multiresolution precoding matrix indicators feedback | |
| Baker | From LTE-advanced to the future | |
| US8498193B2 (en) | Method for selection of an optimized number of subscribers in mobile radio systems | |
| EP2929633B1 (en) | Coordinated transmission and reception in a wireless telecommunications network | |
| CN103442366B (en) | A kind of cognitive radio users space division multiplexing method based on interference alignment | |
| KR102306100B1 (en) | Apparatus for processing transmission/reception signal for interference alignment in a mu-mimo interference broadcasting channel and method thereof | |
| CN101925070B (en) | Resource allocation method for cognitive system based on space multiplexing | |
| CN102227949B (en) | Method and equipment for controlling co-channel interference in wireless communication system | |
| CN101741446A (en) | Multiple-input multiple-output method and device | |
| CN102186212A (en) | Intercell cooperation scheduling method, system and user equipment | |
| CN104135315B (en) | Descending CoMP mixing collaboration communication method based on LTE Advanced systems | |
| Guo et al. | Adaptive SU/MU‐MIMO scheduling schemes for LTE‐A downlink transmission | |
| Mauricio et al. | A low complexity solution for resource allocation and SDMA grouping in massive MIMO systems | |
| Atzeni et al. | Distributed joint receiver design for uplink cell-free massive MIMO | |
| CN103716079B (en) | Method and apparatus for coordinated multipoint downlink transmission between two cells | |
| CN101989869B (en) | Joint pre-coding and power control method for multi-antenna cellular network | |
| Apelfröjd et al. | Design and measurement-based evaluations of coherent JT CoMP: a study of precoding, user grouping and resource allocation using predicted CSI | |
| Zhao et al. | Multi-user MAC protocol for WLANs in MmWave massive MIMO systems with mobile edge computing | |
| CN102752071B (en) | Downlink precoding method and central processing node for multipoint cooperative system | |
| CN106341168B (en) | Method for precoding, method for sending information and its device | |
| CN107911867B (en) | Downlink transmission and interference coordination method of cellular and D2D hybrid communication network | |
| Feng et al. | Overlapped clustering for comp transmissions in massively dense wireless networks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |