CN104205980A - Method and apparatus for interference control in wireless communication system - Google Patents

Method and apparatus for interference control in wireless communication system Download PDF

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Publication number
CN104205980A
CN104205980A CN201280071710.2A CN201280071710A CN104205980A CN 104205980 A CN104205980 A CN 104205980A CN 201280071710 A CN201280071710 A CN 201280071710A CN 104205980 A CN104205980 A CN 104205980A
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China
Prior art keywords
base station
coding matrix
feedback information
information
subscriber equipment
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Chinese (zh)
Inventor
姜蕾
雷鸣
金石
戴咏玉
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NEC China Co Ltd
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NEC China Co Ltd
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    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Abstract

The present invention relates to a method and apparatus for interference control in a wireless communication system. According to an embodiment of the present invention, a method for operating a base station is provided. The method comprises the stesp of receiving first feedback information from each of a first group of user equipment served by a first base station, wherein the first feedback information includes at least information indicative of a first precoding matrix included in a first cluster and information indicative of a second cluster that includes a second precoding matrix different from the first precoding matrix; exchanging feedback information with a second base station, wherein the second base station receives from each of a second group of user equipment served by the second base station second feedback information, the second feedback information including at least information indicative of a first precoding matrix and information indicative of a cluster that includes a second precoding matrix different from the first precoding matrix; coordinately scheduling, at least based on the first feedback information and the second feedback information, the first group of user equipment and the second group of user equipment.

Description

Be used for the method and apparatus of the interference control of wireless communication system
Technical field
Present invention relates in general to a kind of communication system, relate in particular to a kind of method and apparatus of the interference control for wireless communication system
Background technology
In radio communication, because it provides compared with conventional a single aerial system the spectrum efficiency that obviously promotes to some extent and the ability of link reliability, multi-user's multiple-input and multiple-output (MIMO) transmission technology has obtained suitable concern in recent years.It becomes the key technology using in third generation partner program (3GPP) standard of Long Term Evolution (LTE)/LTE-Advanced (LTE-A) Long Term Evolution.
The collaboration MIMO treatment technology of the cooperation based on multiple base stations is proposed to eliminate the interference of minizone and to improve Signal Interference and Noise Ratio (SINR).Cooperative base station exchange channel condition information (CSI) and transmission data are processed to carry out collaboratively MIMO.
In order to improve network capacity and to reduce the presence of intercell interference between the macro base station of nodes higher deployment density, there is the network that formed by the mixed form of macrocell and low-power and low cost node or WAP (wireless access point), it is known as heterogeneous network.There are many deployment scenario for HetNet.For example, for indoor scenario, the Femto cell that can use its through-put power to be connected with macrocell lower than 100mW and via digital subscriber line (DSL); Can use the indoor relaying of its through-put power lower than 100mW; Indoor long haul radio head end (the RRH)/hot-zone (Hotzone) such as indoor femto base station (pico) that uses its through-put power to be connected with macrocell lower than 100mW and via the high speed backhaul such as optical fiber.In outdoor situation, can use the outdoor relaying with 250mW-2W through-put power; Can use the outdoor RRH/ hot-zone such as outdoor femto base station that there is 250mW-2W through-put power and be connected with macrocell via the high speed backhaul such as optical fiber.Conventionally, such small-sized, low power base station can be known as low power base station, and the macro base station in itself and HetNet forms contrast.
In HetNet, macro base station and be deployed in (multiple) low power base station at the covering edge of this macro base station can cooperative operation with the virtual MIMO system as being equal to.Expect the solution of the interference control for wireless communication system that a kind of HetNet of being applicable to situation is provided.
Summary of the invention
In order to solve the problems of the prior art, aim to provide a kind of solution of the interference control for wireless communication system improving to some extent according to one or more methods of the present invention and device embodiment.
According to an aspect of the present invention, embodiments of the invention provide a kind of method for base station is operated.The method comprises: each subscriber equipment from the first user equipment group being served by the first base station receives the first feedback information, and this first feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from the first pre-coding matrix; With the second base station exchange feedback information, wherein this second base station each subscriber equipment from second group of user equipment of being served by the second base station receives the second feedback information, and this second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from the first pre-coding matrix; At least based on this first feedback information and the second feedback information, first user equipment group and the second group of user equipment are carried out to cooperative scheduling.
According to another aspect of the present invention, embodiments of the invention provide a kind of base station.This base station comprises: receiving element, each subscriber equipment being configured to the first user equipment group from being served by this base station receives the first feedback information, and this feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from the first pre-coding matrix; Crosspoint, be configured to and other base station exchange feedback information, wherein this other base station each subscriber equipment from second group of user equipment of being served by this other base station receives the second feedback information, and this second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from the first pre-coding matrix; Scheduling unit, it is configured at least based on this first feedback information and the second feedback information, first user equipment group and the second group of user equipment be carried out to cooperative scheduling.
The other aspect according to the present invention, embodiments of the invention provide a kind of device for base station is operated.This device comprises: receive the device of the first feedback information for each subscriber equipment of the first user equipment group from being served by the first base station, this first feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from the first pre-coding matrix; Be used for the device with the second base station exchange feedback information, wherein this second base station each subscriber equipment from second group of user equipment of being served by the second base station receives the second feedback information, and this second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from the first pre-coding matrix; For at least first user equipment group and the second group of user equipment being carried out based on this first feedback information and the second feedback information the device of cooperative scheduling.
The other aspect according to the present invention, embodiments of the invention provide a kind of method for subscriber equipment is operated, comprise: to the base station report feedback information of serving for this subscriber equipment, wherein this feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from this first pre-coding matrix.
The other aspect according to the present invention, embodiments of the invention provide a kind of subscriber equipment.This subscriber equipment comprises: reporting unit, be configured to the base station report feedback information of serving for this subscriber equipment, wherein this feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from this first pre-coding matrix.
The other aspect according to the present invention, embodiments of the invention provide a kind of device for subscriber equipment is operated.This device comprises: for the device of the base station report feedback information to serving for this subscriber equipment, wherein this feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from this first pre-coding matrix.
Brief description of the drawings
The inventive features that is regarded as characteristic of the present invention provides in claims.But the present invention, its Implementation Modes, other target, Characteristics and advantages will be better understood by reading the detailed description of exemplary embodiment being carried out below with reference to accompanying drawing, wherein:
Fig. 1 indicative icon can implement therein according to the example of the wireless communication system of the embodiment of the embodiment of the present invention;
Fig. 2 indicative icon according to the flow chart for method that the subscriber equipment of wireless communication system is operated of the embodiment of the present invention;
Fig. 3 indicative icon the wave beam of code book based on oversampled discrete Fourier transform (DFT) form pattern;
Fig. 4 indicative icon according to the flow chart for method that the base station of wireless communication system is operated of the embodiment of the present invention;
Fig. 5 has schematically shown according to the block diagram of the subscriber equipment of the embodiment of the present invention;
Fig. 6 has schematically shown according to the block diagram of the base station of the embodiment of the present invention.
Embodiment
Subsequently, with reference to accompanying drawing, embodiments of the invention are described.In the following description, many details have been set forth to more all sidedly the present invention is understood.But, it will be apparent to one skilled in the art that embodiments of the present invention can not have these details.In addition, should be understood that, the present invention is not limited to as specific embodiment described here.In contrast, any combination of following characteristics and key element can be considered to the present invention implemented and put into practice, and no matter whether they relate to different embodiment.Therefore, unless otherwise clearly instruction in the claims, otherwise the only object for illustrating of following aspect, feature, embodiment and advantage, and be not appreciated that key element or the restriction of claims.
Fig. 1 indicative icon can implement therein according to the example of the wireless communication system of the embodiment of the embodiment of the present invention.
With reference to figure 1, HetNet 100 is made up of macro base station 110 and for example at least one low power base station of RRH node 120 as shown.Macro base station 110 and RRH node 120 can be respectively its oneself subscriber equipment and serve.RRH node 120 is connected with macro base station 110 via the backhaul of for example optical fiber.Should be noted that, although adopt the example of RRH node as low power base station, but be not limited to RRH node according to the low power base station of one or more embodiment of the present invention, but comprise the arbitrarily suitable low power base station such as femto base station, relay, femto base station etc.
Do not lose any generality, consider the situation that wherein macro base station 110 and RRH node are served for its oneself subscriber equipment in identical Radio Spectrum Resource, above-mentioned identical Radio Spectrum Resource for example occupies identical transmission bandwidth or subband.Suppose that macro base station 110 is equipped with N mindividual antenna, RRH node 120 has N rRHindividual antenna, each subscriber equipment is equipped with individual antenna.Macro base station 110 and RRH node 120 have its oneself code book, and they are represented as respectively C 1and C 2.C 1and C 2all by known to all subscriber equipmenies in macro base station 110 and RRH node 120 and HetNet 100.
The group of user equipment of being served by macro base station 110 can be by I={1, and 2 ..., i ..., K 1represented, and the group of user equipment of being served by RRH node 120 can be by J={1, and 2 ..., j ..., K 2represented.Subscriber equipment in HetNet 100 can be assigned to one of grand groups of users and RRH groups of users based on predefine rule.For example, such distribution can be based on maximum reference signal received power (RSRP).Subscriber equipment k receives reference signal from macro base station 110 and RRH node 120 respectively.Received power from the reference signal of macro base station 110 is from RRH node 120 be if met k=1 ..., K, subscriber equipment k is assigned to grand groups of users; If met k=1 ..., K, user k is assigned to RRH groups of users; And if meet subscriber equipment can be by Random assignment to any one in Zhe Liangge group.
In the time that the type (that is, which group this subscriber equipment belongs to) of subscriber equipment is able to be determined, its feedback information of this subscriber devices compute and send it to its serving BS to be further processed.
According to one or more embodiment of the present invention, introduce additional feedback information, and can jointly and side by side carry out to select to improve to disturb for the macro base station such as macro base station 110 and such as the wave beam of the low power base station of RRH node 120 and subscriber equipment and control.In addition, each embodiment of the present invention supports the more performance of balance for the subscriber equipment of being served by macro base station and the subscriber equipment of being served by low power base station.
With reference to figure 2-6, will be described in detail each embodiment of the present invention.
Fig. 2 indicative icon according to the flow chart for method 200 that the subscriber equipment of wireless communication system is operated of the embodiment of the present invention.
With reference to figure 2, at step S210, report as the feedback information being calculated to its serving BS from user terminal.
According to one or more embodiment of the present invention, this feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from this first pre-coding matrix.
In one embodiment of the invention, the first pre-coding matrix is the pre-coding matrix of supporting the highest power received at subscriber equipment place, and the second pre-coding matrix is the pre-coding matrix of following of the interference minimum of support to described the first pre-coding matrix.
In one embodiment of the invention, pre-coding matrix is according to making the cross-correlation in same cluster maximize and make the minimized standard of crosscorrelation between different clusters be grouped into different clusters.
The over-sampling DFT code book of for example considering to have over-sampling factor 4, it can be divided into 4 clusters according to above standard.Fig. 3 schematically illustrates the beam forming pattern of the code book of the discrete Fourier transform (DFT) based on over-sampling.Cluster index (CI) be 0,1,2,3 and cluster can be expressed as followsin:
C ( 0 ) = { w 1 , w 2 . . . w 4 } C ( 1 ) = { w 5 , w 6 . . . w 8 } C ( 2 ) = { w 9 , w 10 . . . w 12 } C ( 3 ) = { w 13 , w 14 . . . w 16 } - - - 1 )
Wherein pre-coding matrix (vector) k in this code book is represented as
w k = [ 1 , e jπk / 8 , e j 2 πk / 8 , e j 3 πk / 8 ] T / 2 .
At grand groups of users I to code book C 1adopt M 1under the condition of-cluster grouping scheme, each cluster having quantity is T i, m=4 (m=0,1 ..., M 1-1) precoding vectors w n, wherein n ∈ Ω i, m={ Z i, m-1+ 1 ..., Z i, m-1+ T i, m, Z i, 0=0 and as for low power nodes, low power nodes groups of users J is to code book C 2adopt M 2-cluster grouping scheme, each cluster having quantity is T j, m=4 (m=0,1 ..., M 2-1) precoding vectors w k, wherein k ∈ Ω j, m={ Z j, m-1+ 1 ..., Z j, m-1+ T j, m, Z j, 0=0 and
For grand subscriber equipment i, the first precoding matrix indicators (PMI) is represented as PMI i, 1and the 2nd PMI is represented as PMI i, 2, and CI i, 1, CI i, 2represent the CI that it is corresponding.Like this, according to one or more embodiment of the present invention, the feedback information of grand subscriber equipment i can obtainedly be (PMI i, 1, CI i, 2), wherein
PMI i , 1 = arg max n ∈ [ 1 , . . . Z I , M 1 ] ( | h 1 , i w n | 2 ) - - - 2 )
PMI i , 2 = arg min k ∈ [ 1 , . . . Z J , M 2 ] ( | h 2 , i w k | 2 ) - - - - 3 )
Wherein and represent to comprise by making the maximized rule of received signal power from macro base station code book C 1selected the first pre-coding matrix cluster, and to comprise rule by making minimum interference and from macro base station code book C 1selected the second pre-coding matrix cluster; || be the magnitude of scalar.
For low power nodes subscriber equipment j, the first precoding matrix indicators (PMI) is represented as PMI j, 1, the 2nd PMI is represented as PMI j, 2, and CI j, 1, CI j, 2represent the CI that it is corresponding.Like this, according to one or more embodiment of the present invention, the feedback information of low power nodes subscriber equipment j can obtainedly be (PMI j, 1, CI j, 2), wherein
PMI j , 1 = arg max k ∈ [ 1 , . . . Z J , M 2 ] ( | h 2 , j w k | 2 ) - - - - 4 )
PMI j , 2 = arg min n ∈ [ 1 , . . . Z I , M 1 ] ( | h 1 , j w n | 2 ) - - - 5 )
Wherein and represent to comprise by making the maximized rule of received signal power from macro base station code book C 2selected the first pre-coding matrix cluster, and to comprise rule by making minimum interference and from macro base station code book C 1selected the second pre-coding matrix cluster; || be the magnitude of scalar.
In one or more embodiment of the present invention, this feedback information further comprises the information of the SINR of equipment for indicating user.
In embodiments of the present invention, the SINR of grand subscriber equipment i will be fed back to macro base station:
SINR i = min k ∈ Ω J , CI i , 2 ( P 1 ρ 1 , i | h 1 , i w PMI i , 1 | 2 σ i 2 + P 2 ρ 2 , i | h 2 , i w k | 2 ) - - - 6 )
The SINR of low power nodes subscriber equipment j will be fed back to low power base station:
SINR j = min n ∈ Ω I , CI j , 2 ( P 2 ρ 2 , j | h 2 , j w PMI j , 1 | 2 σ j 2 + P 1 ρ 1 , j | h 1 , j w n | 2 ) - - - 7 )
Wherein ρ m, n(m ∈ { 1,2}, n ∈ I ∪ J) represents the extensive decay of the Range-based between m base station and nth user's equipment; P 1and P 2represent to meet P 1> P 2macro base station and the delivering power of low power base station; from macro base station to grand subscriber equipment i and the channel vector of low power nodes subscriber equipment j, and represent from low power base station to grand subscriber equipment i and the channel vector of low power nodes subscriber equipment j; || be the magnitude of scalar.
Fig. 4 schematically illustrates the flow chart for method 400 that the base station of wireless communication system is operated according to the embodiment of the present invention.
With reference to figure 4, at step S410, receive the first feedback information from each subscriber equipment of the first user equipment group that served by the first base station.This first feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix.
In one embodiment of the invention, the first pre-coding matrix is the pre-coding matrix of supporting the highest power received at subscriber equipment place, and the second pre-coding matrix is the pre-coding matrix of following of the interference minimum of support to described the first pre-coding matrix.
In one embodiment of the invention, pre-coding matrix is according to making the cross-correlation in same cluster maximize and make the minimized standard of crosscorrelation between different clusters be grouped into different clusters.
In an embodiment of the present invention, be under the condition of macro base station in the first base station, as discussed above, the first feedback information of grand subscriber equipment i can obtainedly be (PMI i, 1, CI i, 2).Under the condition that is low power base station in the first base station, as discussed above, the first feedback information of low power nodes subscriber equipment j can obtainedly be (PMI j, 1, CI j, 2).
In one or more embodiment of the present invention, this feedback information further comprises the information of the SINR that indicates respective user equipment.
In embodiments of the present invention, the SINR of grand subscriber equipment i can be represented as equation 6); And the SINR of low power nodes subscriber equipment j can be represented as equation 7).
At step S420, the first base station and the second base station exchange feedback information.
Similarly, the second base station each subscriber equipment from second group of user equipment of being served by the second base station receives the second feedback information.Identical with the first feedback information, the second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from the first pre-coding matrix.
According to embodiments of the invention, the first base station sends the first feedback information and receives the second feedback information from the second base station to the second base station.This exchange process can be carried out via the backhaul between the first base station and the second base station.Subsequently, the first base station (such as selected base station from the set of macro base station and low power base station) and the second base station (such as other base station in described set) can share mutually their user equipment information.
In step S430, at least based on this first feedback information and the second feedback information, first user equipment group and the second group of user equipment are carried out to cooperative scheduling.
According to one or more embodiment of the present invention, match from described the first selected first user equipment of group and from selected the second user device responsive of described the second group in following determining:
1) the second cluster of first terminal equals the first cluster of the second subscriber equipment; And
2) the first cluster of first terminal equals the second cluster of described the second subscriber equipment.
Especially, after exchange process, the first base station (such as selected base station from the set of macro base station and low power base station) and the second base station (such as other base station in described set) all preserves all feedback informations from first user equipment group and the second subscriber equipment.In one example, according to exchanged feedback information (PMI i, 1, CI i, 2) and (PMI j, 1, CI j, 2), macro base station and low power base station can obtain (CI i, 1, CI i, 2) and (CI j, 1, CI j, 2).If CI i, 1=CI j, 2and CI i, 2=CI j, 1, by macro base station and low power base station, the two is determined and is represented as Q in subscriber equipment pairing (i, j) (m).As a result, as the set of determined all subscriber equipmenies can be represented as Q={Q (1)... Q (m)... Q (M), wherein M represents the maximum quantity of subscriber equipment pairing.
According to one or more embodiment of the present invention, by the first base station and the second base station, the two is selected to carry out cooperative scheduling in the pairing of first user equipment and the second subscriber equipment.
Based on identical predetermined algorithm, the first base station and the second base station can determine that subscriber equipment matches according to the set of all subscriber equipmenies pairing, and subsequently determined subscriber equipment are carried out to cooperative scheduling to transmit and distribute corresponding resource, scheduling and encoding scheme etc.
As example, can usage ratio fair scheduling algorithm be identified for the subscriber equipment pairing (i*, j*) of cooperative scheduling.For each Q (m)(m=1 .., M), can calculate fair proportionality factor.
According to this proportional fair scheduling, grand subscriber equipment i is at the current transmission rate R of time slot t i(t) can be as follows according to the SINR reporting in feedback information icalculate:
R i(t)＝log 2(1+SINR i) 8)
Subsequently, calculate the passing average transmission rate of grand subscriber equipment i at time slot (t+1)
R ‾ i ( t + 1 ) = ( 1 - 1 T c ) R ‾ i ( t ) + 1 T c R i ( t ) , i = i * ( 1 - 1 T c ) R ‾ i ( t ) , i ≠ i * - - - 9 )
Wherein T cit is time window size.
The fair proportionality factor of grand subscriber equipment i can be represented as
Similarly, the fair proportionality factor of low power nodes subscriber equipment j can be represented as wherein
R j(t)＝log 2(1+SINR j) 10)
R ‾ j ( t + 1 ) = ( 1 - 1 T c ) R ‾ j ( t ) + 1 T c R j ( t ) , j = j * ( 1 - 1 T c ) R ‾ j ( t ) , j ≠ j * - - - 11 )
Wherein SINR jin the feedback information of low power nodes subscriber equipment j, report; And T cit is time window size.
In embodiments of the present invention, Q (m)in the fair proportionality factor sum of two subscriber equipmenies be used to determine subscriber equipment pairing (i*, j*):
( i * , j * ) = arg max i ∈ I , j ∈ J [ R i ( t ) R ‾ i ( t ) + R j ( t ) R ‾ j ( t ) ] - - - 12 )
In another embodiment of the invention, consider overall transmission rate and the population mean transmission rate of grand subscriber equipment and low power nodes subscriber equipment, subscriber equipment pairing (i*, j*) can be determined as follows:
( i * , j * ) = arg max i ∈ I , j ∈ J [ R i ( t ) R ‾ i ( t ) + R j ( t ) R ‾ j ( t ) ] - - - 13 )
One or more embodiment more than according to the present invention, are carried out consideration such as the fairness between two kinds of dissimilar subscriber equipmenies of grand subscriber equipment and low power nodes subscriber equipment, and therefore can in HetNet, realize the performance of relative equilibrium.In addition, owing to having set up in one or more embodiments such as the high speed of backhaul, DSL etc. between the first base station and the second base station and having connected reliably, so the increase of institute's exchange message will can not cause obvious performance degradation between the first and second base stations (such as macro base station and RRH node).
With reference to figure 2 and Fig. 4, the processing according to one or more embodiment of the present invention is described.
It should be noted in the discussion above that above description is only exemplary and be not intended to limit the invention.In other embodiments of the invention, the method can have more or less or different steps, and the numbering that step is carried out is only in order to make to describe more concisely and obviously more clear, and not the order between each step is strictly limited; Simultaneously the order of step may with describe different.For example, in certain embodiments, above one or more optional steps can be omitted.The specific embodiment of each step can with describe different.Within all these variations all fall into the spirit and scope of the present invention.
Fig. 5 schematically shows according to the simplified block diagram of the subscriber equipment of the embodiment of the present invention.
Conventionally, each embodiment of UE 500 can include but not limited to cell phone, there is the PDA of wireless communication ability, have wireless communication ability pocket computer, have wireless communication ability image capture device (such as digital camera), there is the game station of wireless communication ability, and integrate portable unit or the terminal of the combination of these functions.
UE 500 is suitable for communicating with one or more base stations in wireless communication system via its aerial array 550.
UE 500 comprises data processor (DP) 510, is coupled to/is embedded into the memory (MEM) 520 of DP 510, and aerial array 550 is coupled to the suitable RF reflector TX/ receiver RX module 540 of DP 510.RF TX/RX module 540 is for carrying out two-way wireless communication with at least one base station.MEM 520 storage programs (PROG) 530.
PROG 530 is believed to comprise program command, in the time that program command is carried out by DP 510, can make UE 500 to operate according to exemplary embodiment of the invention, as method 200 as shown in Figure 3 discussed here.
MEM 520 can have and is anyly suitable for the type of local technical environment and can utilizes any applicable data storage technology to realize, as non-limiting example, these data storage technologies are for example memory device, magnetic storage apparatus and system, light storage device and system, read-only storage and the removable memories of based semiconductor.Although only at a MEM shown in UE 500, in UE 500, can there are several physically different memory cells.
DP 510 carries out as calculated with reference to described any requirement of Fig. 1 and 2.DP 510 can be any type that is suitable for local technical environment, and it can comprise one or more all-purpose computers, special-purpose computer, microprocessor, DSP and the processor based on polycaryon processor framework as non-limiting example.
Subscriber equipment 500 comprises reporting unit (not shown in Fig. 5).This report unit is configured to the base station reporting user facility feedback information of serving for described subscriber equipment, and wherein this feedback information at least comprises that the information of instruction first included pre-coding matrix in the first cluster and instruction comprise the information of the second cluster of second pre-coding matrix different from described the first pre-coding matrix.Can will be appreciated that, the function of this report unit can be implemented by the one or more suitable module of subscriber equipment as described above.
Fig. 6 schematically shows according to the simplified block diagram of the base station of the embodiment of the present invention.
Base station 600 is suitable for communicating with UE group in wireless communication system.As previously discussed, base station 600 can be macro base station (for example, grand eNB) or low power base station (for example, RRH node, femto base station, relay, femto base station etc.).
Base station 600 comprises data processor (DP) 610, is coupled to/is embedded into the memory (MEM) 620 of DP 610, and aerial array 650 is coupled to the suitable RF reflector TX/ receiver RX module 640 of DP 610.RF TX/RX module 640 is for carrying out two-way wireless communication with at least one UE.MEM 620 storage programs (PROG) 630.
PROG 630 is believed to comprise program command, in the time that program command is carried out by DP 610, can make base station 600 to operate according to exemplary embodiment of the invention, as method 400 as shown in Figure 4 discussed here.
MEM 620 can have and is anyly suitable for the type of local technical environment and can utilizes any applicable data storage technology to realize, as non-limiting example, these data storage technologies are for example memory device, magnetic storage apparatus and system, light storage device and system, read-only storage and the removable memories of based semiconductor.Although only at a MEM shown in base station 600, in base station 600, can there are several physically different memory cells.
DP 610 carries out and requires arbitrarily as described in reference to Figure 4 to calculate.DP 610 can be any type that is suitable for local technical environment, and it can comprise one or more all-purpose computers, special-purpose computer, microprocessor, DSP and the processor based on polycaryon processor framework as non-limiting example.
Base station 600 comprises receiving element, crosspoint and scheduling unit (not shown in Fig. 6).This receiving element be configured to the first user equipment group from being served by base station 600 each receive the first feedback information, this first feedback information at least comprises that the information of instruction first included pre-coding matrix in the first cluster and instruction comprise the information of the second cluster of second pre-coding matrix different from the first pre-coding matrix.This crosspoint is configured to and other base station exchange feedback information, wherein each from second group of user equipment of being served by this other base station of this other base station receives the second feedback information, and this second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from the first pre-coding matrix.This scheduling unit is configured at least based on this first feedback information and the second feedback information, first user equipment group and the second group of user equipment be carried out to cooperative scheduling.Can will be appreciated that, the function of this receiving element, crosspoint and scheduling unit can be implemented by the one or more suitable module of base station 600 as described above.
Generally speaking, each embodiment can combine to realize with hardware or special circuit, software, logic or its.For example, some aspects can be implemented with hardware, and other side can or can be implemented by controller, microcontroller or the performed software of other computing equipment with firmware, although the present invention is not limited to this.Although the various aspects of illustrative embodiments of the present invention can be illustrated and be described as block diagram and signaling diagram, also should understand these frames described herein, device, system, technology or method and can be implemented in hardware, software, firmware, special circuit or logic, common hardware or controller or other computing equipment or its some combination as non-limiting example.
Thus, should be appreciated that at least some aspect of illustrative embodiments of the present invention can realize with various assemblies, such as integrated circuit (IC) chip and module.As known in the field, the design of integrated circuit is supermatic process substantially.
The present invention can also realize with computer program, and it comprises can realize all features of method as described herein and can realize the method in the time being loaded in computer system.
Illustrate particularly and illustrated the present invention with reference to preferred embodiment.It should be appreciated by those skilled in the art, can carry out various changes and not deviate from the spirit and scope of the present invention the present invention in form and details.

Claims (26)

1. the method for the first base station is operated, comprising:
Each subscriber equipment from the first user equipment group being served by described the first base station receives the first feedback information, and described the first feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix;
With the second base station exchange feedback information, wherein said the second base station each subscriber equipment from second group of user equipment of being served by described the second base station receives the second feedback information, and described the second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from described the first pre-coding matrix;
At least based on described the first feedback information and described the second feedback information, described first user equipment group and described the second group of user equipment are carried out to cooperative scheduling.
2. according to the process of claim 1 wherein
The first pre-coding matrix is the pre-coding matrix that is supported in the highest power received at respective user equipment place;
The second pre-coding matrix is the pre-coding matrix of following of the interference minimum of support to described the first pre-coding matrix.
3. according to the method for claim 1 or 2, wherein
Described the first feedback information further comprises the information of the Signal Interference and Noise Ratio of the each subscriber equipment in described the first group of instruction, and
Described the second feedback information further comprises the information of the Signal Interference and Noise Ratio of the each subscriber equipment in described the second group of instruction.
4. according to the method for claim 1 or 2, wherein
Pre-coding matrix is according to making the cross-correlation in same cluster maximize and the minimized standard of crosscorrelation between different clusters is grouped in different clusters.
5. according to the method for claim 1 or 2, wherein described first user equipment group and described the second group of user equipment are carried out to cooperative scheduling and comprise:
In response to definite the following, and to from described the first selected first user equipment of group and match from selected the second subscriber equipment of described the second group:
Described second cluster of described first terminal equals described first cluster of described the second subscriber equipment; With
Described first cluster of described first terminal equals described second cluster of described the second subscriber equipment.
6. according to the method for claim 5, wherein described first user equipment group and described the second group of user equipment are carried out to cooperative scheduling and comprise:
Select the pairing of first user equipment and the second subscriber equipment to carry out cooperative scheduling.
7. according to the method for claim 1 or 2, wherein comprise with the second base station exchange feedback information:
Send described the first feedback information and receive described the second feedback information via back haul link.
8. according to the method for claim 1 or 2, wherein
Described the first base station is a selected base station from the set of macro base station and low power base station, and
Described the second base station is another base station in described set.
9. a base station, comprising:
Receiving element, each subscriber equipment being configured to the first user equipment group from being served by described base station receives the first feedback information, and described feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix;
Crosspoint, be configured to and other base station exchange feedback information, wherein said other base station each subscriber equipment from second group of user equipment of being served by described other base station receives the second feedback information, and described the second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from described the first pre-coding matrix;
Scheduling unit, is configured at least based on described the first feedback information and described the second feedback information, described first user equipment group and described the second group of user equipment be carried out to cooperative scheduling.
10. according to the base station of claim 9, wherein
The first pre-coding matrix is the pre-coding matrix that is supported in the highest power received at respective user equipment place;
The second pre-coding matrix is the pre-coding matrix of following of the interference minimum of support to described the first pre-coding matrix.
11. according to the base station of claim 9 or 10, wherein
Described the first feedback information further comprises the information of the Signal Interference and Noise Ratio of the each subscriber equipment in described the first group of instruction, and
Described the second feedback information further comprises the information of the Signal Interference and Noise Ratio of the each subscriber equipment in described the second group of instruction.
12. according to the base station of claim 9 or 10, wherein
Pre-coding matrix is according to making the cross-correlation in same cluster maximize and the minimized standard of crosscorrelation between different clusters is grouped in different clusters.
13. according to the base station of claim 9 or 10, wherein
Described scheduling unit is further configured in response to definite the following from described the first selected first user equipment of group and match from selected the second subscriber equipment of described the second group:
Described second cluster of described first terminal equals described first cluster of described the second subscriber equipment; With
Described first cluster of described first terminal equals described second cluster of described the second subscriber equipment.
14. according to the base station of claim 13, wherein
Described scheduling unit is further configured to select the pairing of first user equipment and the second subscriber equipment to carry out cooperative scheduling.
15. according to the base station of claim 9 or 10, wherein
Described crosspoint is configured to send described the first feedback information and receive described the second feedback information via back haul link.
16. according to the base station of claim 9 or 10, wherein
Described base station is a selected base station from the set of macro base station and low power base station, and
Described other base station is another base station in described set.
17. 1 kinds of methods for subscriber equipment is operated, comprising:
To the base station report feedback information that is the service of described subscriber equipment, wherein said feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix.
18. according to the method for claim 17, wherein
The first pre-coding matrix is the pre-coding matrix that is supported in the highest power received at described subscriber equipment place;
The second pre-coding matrix is the pre-coding matrix of following of the interference minimum of support to described the first pre-coding matrix.
19. according to the method for claim 17 or 18, wherein
Described feedback information further comprises the information of the Signal Interference and Noise Ratio of indicating described subscriber equipment.
20. according to the method for claim 17 or 18, wherein
Pre-coding matrix is according to making the cross-correlation in same cluster maximize and the minimized standard of crosscorrelation between different clusters is grouped in different clusters.
21. 1 kinds of subscriber equipmenies, comprising:
Reporting unit, be configured to the base station report feedback information for the service of described subscriber equipment, wherein said feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix.
22. according to the subscriber equipment of claim 21, wherein
The first pre-coding matrix is the pre-coding matrix that is supported in the highest power received at described subscriber equipment place;
The second pre-coding matrix is the pre-coding matrix of following of the interference minimum of support to described the first pre-coding matrix.
23. according to the subscriber equipment of claim 21 or 22, wherein
Described feedback information further comprises the information of the Signal Interference and Noise Ratio of indicating described subscriber equipment.
24. according to the subscriber equipment of claim 21 or 22, wherein
Pre-coding matrix is according to making the cross-correlation in same cluster maximize and the minimized standard of crosscorrelation between different clusters is grouped in different clusters.
25. 1 kinds of devices for the first base station is operated, comprising:
For receive the device of the first feedback information from each subscriber equipment of the first user equipment group that served by described the first base station, described the first feedback information at least comprises that instruction is included in the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix;
Be used for the device with the second base station exchange feedback information, wherein said the second base station each subscriber equipment from second group of user equipment of being served by described the second base station receives the second feedback information, and described the second feedback information at least comprises the information of indicating the information of the first pre-coding matrix and instruction to comprise the cluster of second pre-coding matrix different from described the first pre-coding matrix;
For at least described first user equipment group and described the second group of user equipment being carried out based on described the first feedback information and described the second feedback information the device of cooperative scheduling.
26. 1 kinds of devices for subscriber equipment is operated, comprising:
For the device of base station report feedback information to be the service of described subscriber equipment, wherein said feedback information at least comprises the information that the information of the first pre-coding matrix in the first cluster and instruction comprise the second cluster of second pre-coding matrix different from described the first pre-coding matrix that is included in of indicating.
CN201280071710.2A 2012-06-07 2012-06-07 Method and apparatus for interference control in wireless communication system Pending CN104205980A (en)

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