CN102342032B - Method for performing COMP operation and transmitting feedback information in a wireless communication system - Google Patents

Method for performing COMP operation and transmitting feedback information in a wireless communication system Download PDF

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CN102342032B
CN102342032B CN201080010700.9A CN201080010700A CN102342032B CN 102342032 B CN102342032 B CN 102342032B CN 201080010700 A CN201080010700 A CN 201080010700A CN 102342032 B CN102342032 B CN 102342032B
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noise
pmi
information
interference
interference variance
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CN102342032A (en
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徐健
具滋昊
任彬哲
郑载薰
高贤秀
李文一
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LG Electronics Inc
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LG Electronics Inc
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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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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    • H04W16/28—Cell structures using beam steering

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Abstract

A method for performing a Coordinated Multi-Point (COMP) operation and transmitting feedback information in a wireless communication system is disclosed. The method includes measuring interference levels or noise and interference variances of reference signals received from one or more neighbor cells, and transmitting to a serving Base Station (BS) information about the measured interference levels or noise and interference variances, and information about a Precoding Matrix Index (PMI) that a mobile station (MS) wants to restrict or recommend for a neighbor cell performing the CoMP operation.

Description

For carry out the method and apparatus of COMP operation and transmission feedback information at wireless communication system
Technical field
The present invention relates to wireless communication system, especially, relate to the method (CoMP) operating for carry out coordinate multipoint (coordinated Multi-Point) at wireless communication system.
Background technology
To improve, on cell edge, user's throughput is as object, and CoMP system is designed to senior multiple-input and multiple-output (MIMO) to be applied to many cell environments.The use of CoMP system can reduce presence of intercell interference in many cell environments.In this CoMP system, multi-cell base station (BS) can be supported associating transfer of data to subscriber equipment (UE).
Each BS can support to use one or more UE of same radio frequency resource simultaneously, UE1 to UEK, thus improve systematic function.In addition, BS can operate with space division multiple access (SDMA) by the channel condition information (CSI) based between BS and UE.
There is the CoMP scheme of two types: the Combined Treatment (joint processing) based on data sharing (JP) and cooperative scheduling/wave beam formation (CS/CB).
Fig. 1 illustrates in the Node B of evolution the concept of CoMP between (in eNB) CoMP and eNB.
With reference to figure 1, under many cell environments, exist in eNB 110 and 120 and eNB between 130.In Long Term Evolution (LTE), in eNB, cover multiple communities or sector.There is relation in eNB in the community that the eNB under UE covers and UE.In other words, the ShieNBNei community, community under the identical eNB of management UE community, and ShieNBJian community, community under the eNB different from the eNB of UE.Intercourse information (for example, data and CSI) in identical eNBNei community via x2 interface etc.In different e NBZhong community via backhaul 140 exchange messages.
As illustrated in fig. 1, single cell mimo user 150 in single subdistrict or sector can Yu Gai community or sector in service eNB communication, and many cell mimos user 160 on cell edge can communicate by letter with the multiple service eNB in multiple communities or sector.
Concise and to the point description can be as the spatial channel matrix of feedback information.
Spatial channel matrix H (i, k) can be given:
Figure BPA00001426085900021
Here h r, t(i, k) represent this spatial channel matrix H (i, k) element, Nr represents to receive the number of (Rx) antenna, Nt represents to send the number of (Tx) antenna, and r represents the index of Rx antenna, and t represents the index of Tx antenna, i represents the index of Orthodoxy Frequency Division Multiplex (OFDM) or single carrier-Orthodoxy Frequency Division Multiplex (SC-OFDM) symbol, and represents the index of subcarrier.
The element h of this spatial channel matrix H (i, k) r, t(i, k) is illustrated in the channel status between r Rx antenna and t Tx antenna.
Applicable to space channel covariance of the present invention (covariance) matrix, R can be expressed as:
R = E [ H i , k H i , k H ]
Here H represents this spatial channel matrix, E[] represent mean value, i represents notation index, and k represents sub-carrier indices.
Singular value decomposition (SVD) is in the important Factorization (factorization) of rectangular matrix, signal process and statistics in have many application.For any rectangular matrix, SVD is the summary of the spectral theorem (spectral theorem) of matrix.Spectral theorem shows that radix (base) that can use characteristic value carries out diagonalization at the tenth of the twelve Earthly Branches (unitarily diagonalize) to orthogonal square matrix.Signaling channel matrix H is m × m matrix with real number or complex item.Then, this channel matrix H can be expressed as the product of three following matrixes.
H m×m＝U m×m∑ m×nV n×n H
Here U and V are unitary matrice, and ∑ is m × n diagonal matrix with non-negative singular value.For singular value,
Σ = diag ( σ 1 . . . σ r ) , σ i = λ i ,
This Factorization is that the product of three matrixes is known as SVD.Can be applied to any matrix at SVD, and Eigenvalues Decomposition (EVD) only can be applied in the meaning of orthogonal square matrix, SVD is that non-normal open is used.However, these two decomposition are correlated with.
If this channel matrix H is positive (positive), clear and definite (definite) Hermite (Hermitian) matrix, all characteristic values of this channel matrix H are nonnegative real numbers.The singular value of this channel matrix H and singular vector are its characteristic value and characteristic vector.
EVD can be expressed as:
HH H＝(U∑V H)(U∑V H) H＝U∑∑ TU H
H HH＝(U∑V H) H(U∑V H) H＝V∑ T∑V
Here characteristic value can be λ 1..., λ r.
Conventionally, MS only sends to eNB using pre-coding matrix index (PMI) as feedback information, and therefore, it is difficult for eNB, PMI being arranged to order of priority.Therefore,, due to the difficulty aspect PMI sequence, CoMP operates the puzzlement that is subject to lowering efficiency with accuracy.
Summary of the invention
Technical problem
An object of the present invention is of being designed to address this problem carried out the method for CoMP operation and for sending the method for CoMP feedback information in wireless communication system.
The another object of the present invention that is designed to address this problem is the MS device of carrying out CoMP operation and send CoMP feedback information in wireless communication system.
The a further object of the present invention that is designed to address this problem is in wireless communication system, to carry out BS device and the MS device of CoMP operation.
It should be appreciated by those skilled in the art, the object that can realize by means of the present invention has been not limited to special those that describe hereinbefore, and the above object that the present invention can realize will more be expressly understood with other objects from the detailed description of carrying out together with appended accompanying drawing below.
Technical scheme
Object of the present invention can realize by the method that is provided in wireless communication system sending at MS place CoMP feedback information, in wireless communication system, CoMP operation is carried out in one or more base stations, and the method comprises: MS is intended for to carry out the special neighbourhood community restriction of CoMP operation or PMI (pre-coding matrix index) the group information of recommending sends to serving BS (BS); With signal strength signal intensity yield value or interference level yield value are sent to serving BS broadcasts, the difference between signal strength signal intensity or the interference level calculating when the signal strength signal intensity that this signal strength signal intensity yield value or interference level yield value calculate while being applied to special neighbourhood community with PMI group or interference level and PMI group are applied to special neighbourhood community is corresponding.
Object of the present invention can realize by the method that is provided in wireless communication system sending at MS place CoMP feedback information, in this wireless communication system, CoMP operation is carried out in one or more base stations, and the method comprises: use the reference signal receiving from one or more neighbor cells to measure the Noise and Interference variance corresponding to signal strength signal intensity or interference level; With send the Noise and Interference variance information of Noise and Interference variance that comprises measurement to serving BS (BS), and be intended for the relevant information of the pre-coding matrix index (PMI) carrying out the special neighbourhood community restriction of CoMP operation or recommend with MS.
In another aspect of the present invention, provide herein the MS device in the wireless communication system of carrying out CoMP operation, comprise: measurement module, for using the reference signal measurement receiving from one or more neighbor cells to comprise the Noise and Interference variance yields of signal strength signal intensity or interference level; And transport module, for send the Noise and Interference variance information of Noise and Interference variance yields that comprises measurement to serving BS (BS), and be intended for the relevant information of the pre-coding matrix index (PMI) carrying out the special neighbourhood community restriction of CoMP operation or recommend with MS.
Beneficial effect
According to the present invention, UE and BS can carry out CoMP operation more effectively.
It should be appreciated by those skilled in the art, the effect that can realize by means of the present invention is not limited at special those that describe above, and above advantage of the present invention will more be expressly understood with other advantages from the following detailed description of carrying out together with appended accompanying drawing.
Accompanying drawing explanation
Appended accompanying drawing is included to provide further to be understood the present invention, and it illustrates embodiments of the invention, and works to explain the principle of the invention together with specification.
In the accompanying drawings:
Fig. 1 illustrates in the Node B of evolution the concept of CoMP between (in eNB) CoMP and eNB.
Fig. 2 illustrates in mobile communication system, for example, and the universal signal transmission method of the physical channel using in third generation partner program (3GPP) Long Term Evolution (LTE) system and this physical channel of use.
Fig. 3 illustrates the concept of the operation of the coordinate multipoint (CoMP) between the Node B (eNB) of subscriber equipment (UE) and evolution according to the present invention.
Fig. 4 is the block diagram illustrating according to the configuration of the UE device of an example embodiment of the present invention.
Embodiment
At length be introduced example embodiment of the present invention referring now to appended accompanying drawing.Provide detailed description with reference to appended accompanying drawing below, it is intended to explain example embodiment of the present invention, rather than unique embodiment that can realize according to the present invention is shown.Following detailed description comprises for to the specific detail that the invention provides thorough understanding.But, it will be apparent to one skilled in the art that without such specific detail and also can put into practice the present invention.For example, under being the hypothesis of third generation partner program Long Term Evolution (3GPP LTE) system, mobile communication system provides following detailed description.But except the certain features of 3GPP LTE system, this description is applicable to any other mobile communication system.
In some cases, known structure and equipment are omitted, or illustrate with the block diagram form of the key character that focuses on this structure and equipment, to can not make concept indigestion of the present invention.Run through the Reference numeral that this specification is identical and will be used in reference to identical or similar part.
In the following description, " mobile radio station (MS) " supposes to refer to mobile or fixing ustomer premises access equipment, such as subscriber equipment (UE), and " base station (BS) " supposes to refer to any node of the network terminal of communicating by letter with MS, such as the Node B (eNB or e Node B) of Node B and evolution.
In mobile communication system, MS can be on down link receives information from BS, and MS can be in up link transmission information to BS.The information that is sent or received by MS comprises data and control information.According to the type of the information that sends or receive by MS and object, there are various physical channels.
Fig. 2 illustrates in mobile communication system, for example, and the universal signal transmission method of the physical channel using in 3GPP LTE system and this physical channel of use.
With reference to figure 2, once switch on power, or in the time that MS enters community at first, MS carries out search of initial zone at step S201, relates to its timing is synchronizeed with eNB.For search of initial zone, MS can be synchronizeed with eNB, and by receiving main synchronizing channel (P-SCH) and secondary synchronization channel (S-SCH) acquired information, such as cell identifier (ID).Then, MS can be at Physical Broadcast Channel (PBCH) Shang Cong community receiving broadcasting information.Meanwhile, MS can determine downlink channel status by receiving downlink reference signal during search of initial zone (DL RS).
After search of initial zone, MS can be received physical downlink control channel (PDCCH) and be received physical down link sharing channel (PDSCH) by the information based on PDCCH at step S202, obtains more particular system information.
On the other hand, if MS accesses eNB at first, if or MS not for the radio resource of signal transmission, it can carry out the random access procedure to eNB at step S203 to S206.For random access, MS can be upper using predetermined sequence as the leading eNB that sends at Physical Random Access Channel (PRACH) at step S203, and receive the response message for random access at PDCCH with on corresponding to the PDSCH of PDCCH at step S204.In the case of except the random access based on competition switching, MS can be by further transmitting PRACH and carrying out competition solution process at step S206 reception PDCCH and relevant PDSCH thereof at step S205.
After previous process, as conventional downlink/uplink signals transmission, MS can receive PDCCH and PDSCH at step S207, and transmits physical uplink link sharing channel (PUSCH) and physical uplink control channel (PUCCH) at step S208.Here, send to the uplink control information of BS from MS, or can comprise down link or up link acknowledgement/non-acknowledgement (ACK/NACK) signal, CQI (CQI), pre-coding matrix index (PMI) and/or order designator (RI) from the down link control information that MS sends to BS.The MS that is applicable to operate in 3GPP LTE system can send control information on PUSCH and/or PUCCH, such as CQI, PMI and/or RI.
In the time using with geographic significance, the term " eNB " using herein can exchange with " community " or " sector ".Service eNB (or community) can be considered to provide main services to MS, and with the eNB (or community) of coordinate multipoint (CoMP) scheme sending and receiving control information.In this article, service eNB (community) is called grappling (anchor) eNB (or community).This service eNB can send the information receiving from adjacent eNB (or community).If used with geographic significance, term " adjacent eNB " also can be called " neighbor cell ".CoMP group refers to can carry out CoMP operation Yi Zu community.
In many cell environments, the use of CoMP brings the improvement of the communication performance of MS on cell edge.CoMP scheme is categorized as the data sharing based on cooperation multiple-input and multiple-output (MIMO) technology that is called Combined Treatment (JP), and seek to reduce the cooperative scheduling of presence of intercell interference/wave beam and form (CS/CB), such as the poorest companion (worst companion) or best companion (best companion).According to the poorest companion's scheme, MS will cause the PMI of poor interference,, for the community of carrying out CoMP operation (hereinafter, be called CoMP community) the poorest companion PMI report to service eNB, make community use suboptimum (sub-optimal) PMI disturbing PMI except the poorest.Therefore, presence of intercell interference is lowered.In contrast, preferably companion's scheme by will causing the PMI of least interference by MS, that is, reports to service eNB to make CoMP community use best companion PMI for the best companion PMI of CoMP community, reduces presence of intercell interference.
For effective realization of CoMP scheme, there are the needs to definition metrical information, this metrical information comprises the interference level (or signal strength signal intensity) of the neighbor cell of being measured by MS and is sent to the feedback information of eNB by MS.When the measuring process of MS and all operations were step relevant with CoMP activity group (active set) are when designated, can carry out effective CoMP operation.CoMP activity group is one group of transfer point, and this transfer point is served specific MS, and carries out actual CoMP transmission.
In CoMP scheme, in the situation of CS/CB, MS can send to service eNB to be intended for it with neighbor cell (CoMP the neighbor cell in brief) restriction of CoMP operation and/or the relevant information of PMI of recommending.In the time that multiple MS operate with CoMP, the PMI that they are intended for the restriction of CoMP neighbor cell and/or recommendation can increase on number.Then, preferably PMI selectional restriction and/or that recommend is carried out in CoMP neighbor cell among the PMI restriction receiving from MS and/or that recommend.Therefore, consider that MS is for the restriction of PMI and/or the request of recommendation, order of priority can be arranged by PMI restriction and/or that recommend in CoMP neighbor cell.But, worthless be only the PMI information based on receiving from MS sort restriction and/or recommend PMI.
In this article, the invention provides for allowing CoMP neighbor cell effectively PMI to be arranged the method for order of priority.One of method is that additional information is sent to service eNB by MS except PMI information.This additional information can send on the opportunity such as following: 1) when CoMP group is configured, and 2) when in the time that CoMP operating period PMI information is sent out.
To first describe in the time that CoMP group is configured for send the method for additional information from MS below.
The metrical information of interference level (or signal level) that can be based on comprising neighbor cell is by MS etc. configuration CoMP group.Due to the neighbor cell configuration CoMP group directly to affect MS, be flexibly so CoMP assembly is put.MS can be with reference to neighbor cell list in the time measuring interference level of neighbor cell etc.This neighbor lists can receive from serving BS broadcasts in advance, for configuration CoMP group.Alternatively, MS can spontaneously produce neighbor cell list by measuring neighbor cell.
The metrical information relevant with the interference level of the neighbor cell of measuring for MS configuration CoMP group can be expressed as various types of values.Represent that type comprises reference signal received power (RSRP), the reference signal quality of reception (RSRQ), reference signal strength indicator (RSSI), propagation delay (PD), the carrier wave of neighbor cell that makes to make good use of PMI or poor PMI with interference plus noise than (CINR) or Signal to Interference plus Noise Ratio (SINR), the CINR of Serving cell or SINR improve, the CINR that the CINR of its indication by Serving cell measured by making when neighbor cell make good use of PMI or do not use poor PMI when or SINR are previous with this Serving cell or SINR measurement etc. are compared and the channel status of definite Serving cell is enhanced what degree that reaches.Among them, CINR or SINR improvement value can help neighbor cell sequence PMI.MS can generation value, CINR or the SINR of measured Serving cell when this value is not used the poor PMI of MS restriction corresponding to the good PMI that uses MS to recommend when neighbor cell or its, and neighbor cell application MS recommend or the PMI of MS restriction before poor between the CINR of Serving cell or SINR, and this value is sent to service eNB by MS.Once receive information from service eNB, neighbor cell can recognize the channel status of service eNB has improved how many from CINR or SINR difference, and therefore easily PMI is arranged to order of priority.
By this way, MS can use corresponding to CINR or the SINR improvement of pilot power level, RSRP etc. and be worth to measure the channel quality states between MSHe community in LTE system.RSRP is the linear averaging of distributing to the power of resource element, is mapped to this resource element for measuring at predetermined frequency bandwidth small area special datum signal.Can determine according to the received energy of the significant character period except Cyclic Prefix (CP) power of each resource element in Resource Block.RSRP can be applied to MS under RRC idle condition and RRC connection status.If MS is with the operation of receive diversity scheme, the RSRP value of report is the linear averaging of the performance number of diversity branch (diversity branch).
Except relevant MS is intended for the information of PMI of neighbor cell restriction and/or recommendation, MS can send to service eNB by other various types of measurements described above.Meanwhile, MS even can send to service eNB by various types of measurements in CoMP operating period.Especially, MS can measure again in CoMP operating period interference level of CoMP neighbor cell etc., and other various types of measurements are sent to service eNB.
Measurement (for example, RSRP etc.) based on its neighbor cell, MS can organize needed information reporting to service eNB by being used for configuring CoMP.The information of report can comprise the community ID of neighbor cell and the one or more previous measurement of neighbor cell.Spontaneously produce at MS under the situation of neighbor cell list, it can directly send to service eNB by the community ID of the neighbor cell of measurement.
On the other hand, if service eNB sends to MS by neighbor cell list, MS can send with the predefined procedure of community ID the RSRP of neighbor cell, or further the community ID of neighbor cell is sent to service eNB together with measuring.Further can expect, MS arranges the index corresponding to community ID with the order of interference level, and sends to service eNB together with this index is measured with the interference level that is mapped to this index.
Service eNB can receive with MS and be intended for the relevant information of the PMI of CoMP neighbor cell restriction and/or recommendation from MS, and about the information of the interference level of CoMP neighbor cell.Then, this service eNB can send to CoMP neighbor cell by the PMI information of reception and interference level information.PMI restriction and/or that recommend can be determined based on PMI information and interference level information in each CoMP neighbor cell, and PMI is arranged to order of priority.CoMP neighbor cell can only be counted and be determined PMI restriction and/or that recommend by PMI without interference level information.More specifically, the counting of the PMI that CoMP neighbor cell can be based on for limiting and/or the recommend PMI that sorts.But, when a small amount of MS relates to CoMP operation, or restriction and/or recommend counting equal on PMI in, order of priority can not arranged to PMI in CoMP neighbor cell.However, CoMP neighbor cell can be defined as recommending and/or the maximum PMI of limit request.Therefore the expense, producing to eNB from MS transmission additional feedback control information can reduce.
To be described in CoMP operating period and send the situation of PMI information and additional information below.
When carry out CoMP operation in the situation that CoMP group is configured, or carry out CoMP operation in the situation that not configuring CoMP group time, MS can select PMI restriction and/or that recommend for disturbing neighbor cell, and the PMI of selection is sent to service eNB.In the time that MS sends to service eNB by PMI to carries out CS/CB scheme in CoMP operating period, service eNB can be used the interference level information receiving from MS during configuration CoMP group, makes CoMP neighbor cell arrange order of priority to PMI.Especially, if the interference level information for neighbor cell measurement is used during CoMP assembly is put, MS can only send to service eNB by the PMI information for neighbor cell in CoMP operating period.Therefore, with feedback overhead still less, PMI is arranged to order of priority.
Meanwhile, MS can send interference level information with together with PMI information for CoMP neighbor cell in CoMP operating period.The interference level information (the initial relevant information in the CoMP system that does not configure CoMP group) of reporting for configuration CoMP group can not reflect time dependent interference level.Therefore, MS sends PMI information and interference level information together.PMI information and interference level information can send in the same or different transmission period.
Additional interference level information can be expressed as various types of measured values, is similar to the value of the relevant neighbor cell of being measured by MS during configuration CoMP group.As statement before, represent type comprise RSRP, RSRQ, RSSI, PD, for the CINR or the SINR that make CINR that the neighbor cell of making good use of PMI or poor PMI measures or SINR, Serving cell improve, the CINR that the CINR of its indication by the Serving cell measured by making when neighbor cell make good use of PMI or do not use poor PMI when or SINR are previous with Serving cell or SINR measurement etc. are compared and the channel status of definite Serving cell is enhanced what degree that reaches.Among them, CINR or SINR improvement value can help neighbor cell sequence PMI.MS can generation value, measured CINR or SINR when this value is not used the poor PMI of MS restriction corresponding to the good PMI that uses MS to recommend when neighbor cell or its, and neighbor cell application MS recommend or the PMI of MS restriction before CINR or SINR between poor, and this value is sent to service eNB by MS.Once receive information from service eNB, neighbor cell can recognize the channel status of service eNB has improved how many from CINR or SINR difference, and therefore easily PMI is arranged to order of priority.By this way, MS can measure when poor between the interference level of the Serving cell in its PMI group time and the interference level of the Serving cell in the time that neighbor cell is not applied PMI and organized of neighbor cell applicative notifications.
Except being used for sending the method for PMI information and interference level information from MS in CoMP operating period, can expect the method for sending PMI information and Noise and Interference variance information.In order to help CoMP neighbor cell to arrange order of priority to PMI, MS is further transmitted noise and interference variance information except PMI information.Thereby CoMP neighbor cell is PMI selectional restriction and/or that recommend effectively, and further they is arranged to order of priority.
Below, by describing the method that by MS, PMI information and noise and interference variance information is sent to service eNB, as feedback transmission scheme.First the feedback information of, definition being measured and being sent by MS.
Ws represents the PMI selecting for the MS of Serving cell,
Figure BPA00001426085900131
represent the Serving cell measured by MS Noise and Interference variance ( can be the signal strength signal intensity of the Serving cell measured by MS),
Figure BPA00001426085900133
represent the PMI that MS is intended for the restriction of CoMP neighbor cell and/or recommends,
Figure BPA00001426085900134
represent the Noise and Interference variance of remaining non-CoMP community,
Figure BPA00001426085900135
represent in the time that PMI restriction and/or that recommend is applied to CoMP neighbor cell, the Noise and Interference variance (signal strength signal intensity of CoMP neighbor cell or interference strength) of CoMP neighbor cell,
Figure BPA00001426085900136
represent when the Noise and Interference variance of PMI restriction and/or that recommend CoMP neighbor cell when being applied to CoMP neighbor cell and in the time that PMI restriction and/or that recommend is not applied to CoMP neighbor cell poor between the Noise and Interference variance of CoMP neighbor cell,, the variation (variation of the CoMP neighbor cell aspect signal strength signal intensity or interference strength) of the CoMP neighbor cell aspect Noise and Interference variance
Figure BPA00001426085900137
represent the Noise and Interference variance of CoMP neighbor cell in the time that the PMI of restriction is applied to CoMP neighbor cell,
Figure BPA00001426085900138
represent the Noise and Interference variance of CoMP neighbor cell in the time that the PMI recommending is applied to CoMP neighbor cell,
Figure BPA00001426085900139
poor (variation of the CoMP neighbor cell aspect Noise and Interference variance) when representing the Noise and Interference variance of CoMP neighbor cell in the time that the PMI of restriction is applied to CoMP neighbor cell and work as the PMI limiting not to be applied to CoMP neighbor cell between the Noise and Interference variance of CoMP neighbor cell
Figure BPA000014260859001310
poor (variation of the CoMP neighbor cell aspect Noise and Interference variance) when representing the Noise and Interference variance of CoMP neighbor cell in the time that the PMI recommending is applied to CoMP neighbor cell and work as the PMI recommending not to be applied to CoMP neighbor cell between the Noise and Interference variance of CoMP neighbor cell
Figure BPA00001426085900141
represent the Noise and Interference variance of whole communities that MS can measure in the time that PMI restriction and/or that recommend is applied to each CoMP neighbor cell, and
Figure BPA00001426085900142
represent the Noise and Interference variance when PMI restriction and/or that recommend whole communities that MS can measure when being applied to CoMP neighbor cell, and poor between the Noise and Interference variance of whole communities that MS can measure in the time that PMI restriction and/or that recommend is not applied to CoMP neighbor cell.
Exemplary according to sending to the type of Noise and Interference variance yields of service eNB from MS and the transmission of feedback information scheme of dividing by describing in more detail.
One of transmission of feedback information scheme,, one of Noise and Interference variance information transmission scheme be the MS of cell edge except MS request for the restriction of CoMP neighbor cell and/or the PMI of recommendation, can also be by the Noise and Interference variance about remaining non-CoMP community
Figure BPA00001426085900143
send to service eNB,
Another Noise and Interference variance information transmission scheme is the Noise and Interference variance except the PMI of the restriction for CoMP neighbor cell and/or recommendation and remaining non-CoMP community
Figure BPA00001426085900144
outside, MS can also work as PMI restriction or that recommend when being applied to CoMP neighbor cell by the Noise and Interference variance of CoMP neighbor cell
Figure BPA00001426085900145
send to service eNB, N is illustrated in the index of interfered cell among CoMP neighbor cell, and
Figure BPA00001426085900146
represent the Noise and Interference variance of specific CoMP neighbor cell.
Figure BPA00001426085900147
expression can be from
Figure BPA00001426085900148
derive, its be illustrated in when the Noise and Interference variance of PMI restriction or that recommend CoMP neighbor cell when being applied to CoMP neighbor cell and in the time that PMI restriction or that recommend is not applied to CoMP neighbor cell poor between the Noise and Interference variance of CoMP neighbor cell.In a word, MS can by restriction and/or recommend PMI,
Figure BPA00001426085900149
with
Figure BPA000014260859001410
(or
Figure BPA000014260859001411
) send to service eNB, or by PMI restriction and/or that recommend,
Figure BPA000014260859001412
with all send to service eNB.
In the 3rd Noise and Interference variance information transmission scheme, except the PMI restriction for CoMP neighbor cell and/or that recommend and the Noise and Interference variance of remaining non-CoMP community
Figure BPA00001426085900151
outside, MS can be by the Noise and Interference variance of CoMP neighbor cell in the time that the PMI of restriction is employed
Figure BPA00001426085900152
noise and Interference variance with CoMP neighbor cell in the time that the PMI recommending is applied to CoMP neighbor cell send to service eNB.Replace in
Figure BPA00001426085900154
with
Figure BPA00001426085900155
mS can be by
Figure BPA00001426085900156
with between poor
Figure BPA00001426085900158
send to service eNB.Or MS can by restriction and/or recommend PMI,
Figure BPA00001426085900159
with
Figure BPA000014260859001510
all send to service eNB.
In the 4th Noise and Interference variance information transmission scheme, except the PMI restriction for CoMP neighbor cell and/or that recommend and the Noise and Interference variance of remaining non-CoMP community outside, MS can be by the Noise and Interference variance of whole communities in the time that the PMI of restriction or recommendation is applied to each CoMP neighbor cell
Figure BPA000014260859001512
or
Figure BPA000014260859001513
and before restriction or the PMI that recommends are applied to each CoMP neighbor cell whole poor between the Noise and Interference variance of communities
Figure BPA000014260859001514
send to service eNB.In other words, MS can further send
Figure BPA000014260859001515
or
Figure BPA000014260859001516
Figure BPA000014260859001517
be illustrated in the variation of the Noise and Interference variance aspect of the whole communities that affect MS, rather than the variation of the Noise and Interference variance aspect of independent specific CoMP neighbor cell.
Can further expect as the 5th Noise and Interference variance information transmission scheme, except PMI, the Noise and Interference variance of the Serving cell restriction for CoMP neighbor cell and/or that recommend
Figure BPA000014260859001518
the Noise and Interference variance of remaining non-CoMP community
Figure BPA000014260859001519
outside, MS can be by
Figure BPA000014260859001520
send to service eNB.Or MS can be by PMI and CINR the value restriction for CoMP neighbor cell and/or that recommend
Figure BPA000014260859001521
send to service eNB.The in the situation that of CS/CB, once receive PMI and CINR value
Figure BPA000014260859001523
with
Figure BPA000014260859001524
service eNB can be calculated based on the information receiving
Figure BPA000014260859001525
the in the situation that of JP, service eNB can be calculated CINR σ s 2 + σ N 2 σ v 2 .
According to this transmission plan, MS can send to service eNB by the feedback information of reduction.In addition, MS can use and restriction and/or the PMI that recommends is applied to the Noise and Interference variance of CoMP neighbor cell in the situation of CoMP neighbor cell and restriction and/or the PMI that recommends is not applied to poor between the Noise and Interference variance of CoMP neighbor cell in the situation of CoMP neighbor cell
Figure BPA00001426085900161
cINR is sent to service eNB.More specifically, MS can by restriction and/or recommend PMI,
Figure BPA00001426085900162
with
Figure BPA00001426085900163
send to service eNB.Or MS can by restriction and/or recommend PMI,
Figure BPA00001426085900164
Figure BPA00001426085900165
with
Figure BPA00001426085900166
Figure BPA00001426085900167
send to service eNB.
In the 6th Noise and Interference variance information transmission scheme, the in the situation that of single cell operation, MS can be based on
Figure BPA00001426085900168
further send the information about CoMP neighbor cell, it is sent to service eNB from MS.That is to say, MS can further will send to service eNB about the interference level information of CoMP neighbor cell.In the time that MS measures the signal strength signal intensity of multiple communities, due to expense or some other factors, it may be in the Noise and Interference variance of measuring non-CoMP neighbor cell have any problem in aspect.Then Duo community CoMP operating period, MS can still feed back the value of measuring for transmission of feedback information during single cell operation.Single community feedback information expands to many communities feedback information and causes feedback information more effectively to transmit.Therefore, can be reduced in significantly the interference level of measuring CoMP neighbor cell under many cell environments and the expense that sends feedback information.
For example, except based on single subdistrict, Serving cell
Figure BPA000014260859001610
outside, MS can send the signal strength signal intensity with the normalized CoMP of the signal strength signal intensity neighbor cell of Serving cell
Figure BPA000014260859001611
jP (Combined Treatment) and Cs/CB are by using these values to carry out well.
As mentioned above, the method for transmitted noise and interference variance information is exemplary.MS can, with the various composite types of the channel condition information (such as this Noise and Interference variance information) of measurement, feed back serving BS broadcasts.
Table 1 is listed the exemplary value about neighbor cell measurement by MS below.
Table 1
Figure BPA00001426085900171
Figure BPA00001426085900181
Table 1 illustrates the transmission of the information of exemplary measurement.MS can feed back to serving BS broadcasts by the value of measurement with different combination types.
Fig. 3 illustrates the concept of the operation of the CoMP between MS and BS according to the present invention.
In the illustrational situation of Fig. 3, there are nine neighbor cells altogether for the MS at cell edge, community A is to community I.Among them, three neighbor cells, community A, community B and community C relate to CS/CB or PMI restriction and/or recommend.The MS at cell edge being served by community A is subject to community B and community C disturbs, and wants to limit respectively PMI W2 and the W3 for community B and community C among available PMI.Remaining six non-CoMP communities, community D to the Noise and Interference variance of community I by
Figure BPA00001426085900191
represent.In the time sending the PMI W2 of the restriction for community B of MS request, MS can further send the Noise and Interference variance of community B
Figure BPA00001426085900192
should
Figure BPA00001426085900193
shi community B is using PMI W 2measured under the situation that aspect is restricted.Alternatively, MS can further be sent in the B of community restriction and use the Noise and Interference variance of community B measured in the situation of PMI W2, does not limit poor between the Noise and Interference variance of community B measured in the situation that uses PMI W2 in the B of He community
Figure BPA00001426085900194
the Noise and Interference variance of the situation Xia community B of the PMI making at application restric-tion by
Figure BPA00001426085900195
represent, and make application recommend PMI situation Xia community B Noise and Interference variance by
Figure BPA00001426085900196
represent.Then,
Figure BPA00001426085900197
with
Figure BPA00001426085900198
between difference can be expressed as in the case of PMI restriction or that recommend is applied to the B of community, all communities, community A to the variation of the Noise and Interference variance aspect of community I can be by represent.
MS can send to service eNB with various combinations by these various types of measurements with PMI information.For example, MS can send the PMI for the restriction of community B, W 2, and the Noise and Interference variance of remaining non-CoMP community
Figure BPA000014260859001911
except W 2with
Figure BPA000014260859001912
outside, MS further limits PMI W in the B of Jiang community 2the Noise and Interference variance of situation Xia community B and/or variation aspect the Noise and Interference variance based on PMI restriction
Figure BPA000014260859001914
send to service eNB.In another method, MS can be by the PMI of the restriction for community B, W 2,
Figure BPA000014260859001915
and
Figure BPA000014260859001916
with
Figure BPA000014260859001917
in at least one send to service eNB.
Similarly, about community C, MS can send the PMI for the restriction of community C, W 3, and the Noise and Interference variance of remaining non-CoMP community
Figure BPA00001426085900201
be coated with W 3with
Figure BPA00001426085900202
outside, MS further limits PMI W in the C of Jiang community 3the Noise and Interference variance of situation Xia community B
Figure BPA00001426085900203
and/or according to using and do not use PMI W 3the variation of the Noise and Interference variance aspect of community C
Figure BPA00001426085900204
send to service eNB.In another method, MS can be by the PMI of the restriction for community C, W 3,
Figure BPA00001426085900205
and
Figure BPA00001426085900206
in at least one send to service eNB.
Once receive information described above, service eNB can be calculated poor aspect CINR, PMI restriction and/or that recommend being applied to CoMP neighbor cell and the PMI limiting and/or recommend not being applied to the Δ CINR between CoMP neighbor cell, thereby realize, PMI is arranged to order of priority and effective CS/CB.
In the time that CSI feedback information is sent to service eNB, MS can be transmission normalization CSI feedback information.
MS can for example, report to service eNB by the CSI in addition of the transmission property (, CQI, PMI and RI) except recommending.Conventionally, quantizing CSI feedback and simulate CSI feedback is available as CSI feedback scheme.No matter these CSI feedback kind, MS can comprise spatial channel matrix H at the CSI that reports to Serving cell, or space channel covariance matrix R.Especially, MS can be using spatial channel matrix H or space channel covariance matrix R as CSI feedback information, and additional noise change information (for example, interference level) sends to service eNB.That is to say, MS can send to service eNB by Noise and Interference variance information together with spatial channel matrix H or space channel covariance matrix R.
In order to send more exactly and more effectively CSI, MS can normalization CSI.Normalization can be on the basis of element, or carries out on the column vector basis of spatial channel matrix H and/or space channel covariance matrix R.
Per-column vectorial normalization will be described below.
Can use the maximum execute vector normalization of the norm (norm) of matrix column.Except channel matrix H and/or covariance matrix R, can also be to there is the row normalization Noise and Interference variance of maximum norm.After normalization, every row can send in two kinds of modes.
A kind of is that the weight factor of the norm of each normalized row (weight factor) is sent to service eNB together with CSI feedback information.Service eNB and MS share the code book for example, with norm (, norm=1).Service eNB can obtain phase information from the channel matrix H and/or the covariance matrix R that are received from MS, and determines the amplitude (magnitude) at the upper every row of planisphere (constellation) according to the weight factor of the norm of row.The unique value of weight factor can in statu quo send or send with the form of quantized value.In addition, only send the variation with respect to the weight factor of weight factor 1.
Another mode is that service eNB and MS have the code book corresponding to multiple norms, and service eNB can obtain the amplitude information phase information and planisphere from the channel matrix H and/or the covariance matrix R that are received from MS.Accuracy of estimation improves along with the number of predefined code book.
Describe for send the method for normalized channel matrix H and/or covariance matrix R from MS giving an example now.Having in the 4x4MIMO system of four Tx antennas of eNB and four Rx antennas of MS, MS can send to service eNB by following 4x4 channel matrix H.
[equation 1]
Figure BPA00001426085900221
The norm of supposing row is | v 1|=2, | v 2|=1, | v 3|=1, | v 4|=0.5, can be with the maximum of norm, that is, and the norm normalization channel matrix H of first row.The normalized norm of the row that obtain is respectively 1,0.5,0.5 and 0.25, and MS can send to service eNB by the weighing vector of non-1 norm.
Except weight factor is transferred to service eNB, MS can be by channel matrix value is mapped as to the value in code book shared between service eNB and MS, and channel matrix value is notified to service eNB.For example, there are four code books for predetermined norm
Code book norm=1={ w 1..., w n}
Figure BPA00001426085900222
with
Figure BPA00001426085900223
Figure BPA00001426085900224
Channel matrix H is by the first normalization with the maximum of norm of row.In the example providing as equation 1, the normalized norm value of being mapped as code book of first row norm=1={ w 1..., w nin one, normalized norm value of being mapped as of secondary series
Figure BPA00001426085900225
in one.
Tertial normalized norm value of being mapped as
Figure BPA00001426085900226
in one, and the 4th row normalized norm value of being mapped as
Figure BPA00001426085900227
in one.After mapping, MS can feed back to service eNB by the index corresponding with the value of mapping.
The present invention can be expanded channel matrix H for transmitting multiple eNB or the Noise and Interference variance of covariance matrix R and other eNB.In this case, can use the maximum of the row of all channel matrixes or covariance matrix to carry out normalization.
Fig. 4 is according to the block diagram of the MS device of an example embodiment of the present invention.
With reference to figure 4, the MS device that CoMP enables in wireless communication system comprises processor 410, memory cell 420, Tx module 430 and Rx module 440.
Processor 410 comprises measurement module 411.This measurement module 411 can be measured Noise and Interference variance or the interference level from the reference signal of one or more neighbor cells.
Memory cell 420 can be stored the information receiving from eNB, and the measurement producing from measurement module 411 for predetermined amount of time.Memory cell 420 can by with another element, be replaced such as buffer (not shown).
Tx module 430 can be by the interference level of measuring with measurement module 411 or the relevant information of Noise and Interference variance, and about sending to service eNB for the information of the restriction of special neighbourhood community and/or the PMI that recommends.
Rx module 440 can receiving control information, data etc.
Pattern of the present invention
To realize best mode of the present invention, various embodiment are described.
Industrial applicibility
Be applicable to various wireless communication systems according to the present invention for the method for carrying out CoMP operation and transmission feedback information.
It will be apparent to one skilled in the art that and do not depart from spirit of the present invention or scope, can carry out in the present invention various modifications and variations.Therefore, this invention is intended to cover the modifications and variations of the present invention that are included within claims and its equivalent scope.

Claims (16)

1. for locate to send a method for coordinate multipoint (CoMP) feedback information at mobile radio station (MS) at wireless communication system, in this wireless communication system, CoMP operation is carried out in one or more base stations, and the method comprises:
MS is intended for carrying out the special neighbourhood community restriction of CoMP operation or PMI (pre-coding matrix index) the group information of recommending sends to serving BS (BS); With
The value of the difference between the signal strength signal intensity of calculating when being applied to this special neighbourhood community when PMI group or interference level and the signal strength signal intensity or the interference level that calculate in the time that this PMI group is not applied to this special neighbourhood community is sent to serving BS broadcasts.
2. according to the process of claim 1 wherein that this signal strength signal intensity or interference level are expressed as Signal to Interference plus Noise Ratio (SINR), reference signal received power (RSRP), the reference signal quality of reception (RSRQ), reference signal strength indicator (RSSI), propagation delay (PD) and carrier wave and interference plus noise than any one in (CINR).
3. for locate to send a method for feedback information at mobile radio station (MS) at wireless communication system, this wireless communication system is carried out coordinate multipoint (CoMP) operation, and the method comprises:
Use the reference signal receiving from one or more neighbor cells, measure the Noise and Interference variance corresponding to signal strength signal intensity or interference level; With
Send and comprise the Noise and Interference variance information of measured Noise and Interference variance to serving BS (BS), and be intended for the relevant information of the pre-coding matrix index (PMI) carrying out the special neighbourhood community restriction of CoMP operation or recommend with MS.
4. according to the method for claim 3, wherein this Noise and Interference variance information comprises the first Noise and Interference variance information, this first Noise and Interference variance information be applied to carrying out CoMP operation as restriction or the PMI that recommends special neighbourhood community time difference between the Noise and Interference variance yields that calculates and the Noise and Interference variance yields that calculates in the time that restriction or the PMI that recommends are not applied to carrying out the special neighbourhood community that CoMP operates corresponding.
5. according to the method for claim 3, wherein this Noise and Interference variance information comprises the second Noise and Interference variance of the one or more communities for not carrying out CoMP operation.
6. according to the method for claim 5, wherein this Noise and Interference variance information further comprises the 3rd Noise and Interference variance information, and the 3rd Noise and Interference variance information is corresponding to the value that is applied to calculating under the situation of the special neighbourhood community of carrying out CoMP operation at the PMI of restriction or recommendation.
7. according to the method for claim 5, wherein this Noise and Interference variance information further comprises the 4th Noise and Interference variance information, and it is corresponding that the 4th Noise and Interference variance information and the PMI of restriction or recommendation are applied to difference between Noise and Interference variance yields that the PMI of the Noise and Interference variance yields that calculates under the situation of the special neighbourhood community of carrying out CoMP operation and restriction or recommendation is not applied to calculating under the situation of the special neighbourhood community of carrying out CoMP operation.
8. according to the method for claim 5, wherein this Noise and Interference variance information further comprises the 5th Noise and Interference variance information, and it is corresponding that the PMI that the 5th Noise and Interference variance information and the PMI of restriction are applied to the Noise and Interference variance yields that calculates under the situation of the special neighbourhood community of carrying out CoMP operation and recommendation is applied to the Noise and Interference variance yields that calculates under the situation of the special neighbourhood community of carrying out CoMP operation.
9. according to the method for claim 5, wherein this Noise and Interference variance information further comprises the 6th Noise and Interference variance information, and the 6th Noise and Interference variance information comprises with the PMI of restriction and is applied to carrying out the corresponding value of difference between the Noise and Interference variance yields that the PMI of the Noise and Interference variance yields that calculates under the situation of special neighbourhood community of CoMP operation and recommendation is applied to calculating under the situation of the special neighbourhood community of carrying out CoMP operation.
10. according to the method for claim 5, wherein this Noise and Interference variance information further comprises the 7th Noise and Interference variance information, and it is corresponding that the 7th Noise and Interference variance information and the PMI of restriction or recommendation are applied to the Noise and Interference variance yields that calculates under the situation of whole communities of carrying out CoMP operation.
11. according to the method for claim 5, wherein this Noise and Interference variance information further comprises the 8th Noise and Interference variance information, and it is corresponding that the PMI that the 8th Noise and Interference variance information and the PMI of restriction or recommendation are applied to the Noise and Interference variance yields that calculates under the situation of whole communities of carrying out CoMP operation and restriction or recommendation is applied to operating difference between the Noise and Interference variance yields calculating before whole communities of CoMP operation.
12. according to the method for claim 5, and wherein this Noise and Interference variance information further comprises the information relevant with the Noise and Interference variance yields of Serving cell.
13. according to the method for claim 12, wherein this Noise and Interference variance information further comprises the information about value, use noise and the variance yields of Serving cell, and with lower one: the Noise and Interference variance yields of not carrying out one or more communities of CoMP operation, restriction or the PMI recommending are applied to the Noise and Interference variance yields calculating under the situation of the special neighbourhood community of carrying out CoMP operation, represent this value.
14. according to the method for claim 12, wherein this Noise and Interference variance information further comprises the information about value, use noise and the variance yields of Serving cell, and with lower one: the Noise and Interference variance yields of not carrying out one or more communities of CoMP operation, restriction or the PMI recommending are applied to carrying out the noise that calculates under the situation of special neighbourhood community of CoMP operation and the PMI of variance yields and restriction or recommendation is applied to carrying out the difference between noise and the variance yields calculating before the special neighbourhood community of CoMP operation, represent this value.
15. 1 kinds at wireless communication system, in base station, (BS) locates to carry out the method for coordinate multipoint (CoMP) operation, and the method comprises:
Receive the relevant information of pre-coding matrix index (PMI) that is intended for the restriction of one or more neighbor cells with MS or recommend from MS, and Noise and Interference variance information, this Noise and Interference variance information comprises signal strength signal intensity or the interference level of one or more neighbor cells of being measured by MS; With
PMI information based on receiving and the Noise and Interference variance of reception, produce the information of the sequence of the PMI about limiting or recommend.
Mobile radio station (MS) device in the wireless communication system of 16. 1 kinds of execution coordinate multipoint (CoMP) operation, this MS device comprises:
Measurement module, for using the reference signal measurement receiving from one or more neighbor cells to comprise the Noise and Interference variance yields of signal strength signal intensity or interference level; With
Transport module, for sending and comprise the Noise and Interference variance information of measured Noise and Interference variance yields to serving BS (BS), and be intended for the relevant information of the pre-coding matrix index (PMI) carrying out the special neighbourhood community restriction of CoMP operation or recommend with MS.
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