CN102739344A - Method for reporting channel state information, device thereof and system thereof - Google Patents

Abstract

The invention discloses a method for reporting channel state information. The method comprises that: when reporting CSI is needed, UE reports indication information used for indicating a main service node precoding weight value and/or indication information used for indicating each coordinated node phase correction weight value in a multi-point coordinated report node set to a network side. The invention also discloses a device for reporting the channel state information and a system thereof, CSI feedback overhead is reduced, a problem of unable correlation reception caused by that different transmission layers use a same phase correction weight value can be avoided, a good phase correction effect is realized, and in the condition that the number of transmission layers is larger than 1, an interference brought by different transmission layers between nodes can be effectively avoided. In the invention, the UE can report the CSI based on a multi-coordinated transmission mode indicated by the network side, and the unification of JP and CS/CB feedback modes is facilitated.

Description

A kind of method of reporting status information of channel and device, system

Technical field

The present invention relates to senior Long Term Evolution (LTE-A; Advanced Long-Term Evolution) multipoint cooperative of system transmission (CoMP; Coordinated Multi-Point transmission/reception) technology; Relate in particular to method and device, the system of a kind of reporting status information of channel (CSI, Channel State Information).

Background technology

Along with the proposition of LTE-A demand, people more and more pay attention to node average spectral efficiency (ase) and node edge spectrum efficiency.Because the provisional capital up and down of LTE-A system is with OFDM (OFDM; Orthogonal Frequency Division Multiplexing) or with certain of OFDM be deformed into basic multiple access multiplexing mode, with traditional be the wireless communication system difference of basic multiple access multiplexing mode with code division multiple access (CDMA, Code Division Multiple Access); The LTE-A system does not have processing gain; Intra-node is because complete frequency division quadrature, thus there is interference problem hardly, but thorny relatively in the interference at node edge place; Therefore, the spectrum efficiency of node edge is paid close attention to by people most.

At present, the processing of among the LTE-A node edge place being disturbed mainly contains three kinds of methods: interference randomization, interference eliminated and interference coordination (hiding), wherein; The method of interference randomization generally adopts the straight perhaps method of frame hopping that expands when frequency hopping; Alleviate the interference between the node, need not the network planning, need the support of signaling hardly; But can only alleviate interference, can not fundamentally eliminate the interference between the node; The method of interference eliminated is eliminated interference through adopting some algorithms, generally needs extra physical entity, like multi-antenna technology etc., could realize the elimination to interference; The method of interference coordination (hiding) is through exchange message between node; Make each node according to the information of other nodes and the situation of self, adopt some algorithms to select adequate resources to transmit automatically, realize the efficient utilization of resource between node; Alleviate the chance that the resource collision utilizes between node; Reach the purpose of node edge performance boost, avoid occurring the identical running time-frequency resource of contention between node as far as possible, disturb thereby avoid producing between the node.

At present, the CoMP technology mainly comprises two big types: the Combined Treatment of multipoint cooperative (JP, Joint Processing) and cooperative scheduling/cooperative beam figuration (CS/CB; Coordinated Scheduling and/or Beamforming), wherein, under the JP mode; Data are shared at a plurality of transmission nodes; Through data sharing, that realizes disturbing avoiding and eliminating between the node, and multipoint cooperative Combined Treatment mode further can be divided into many cooperative nodes joint transmission (JT; Joint transmission) and many cooperative nodes fast cell switch (FCS, Fast Cell Switch); Under the CS/CB mode, data are not shared between a plurality of cooperative nodes, and through the cooperation in spatial domain, that realizes disturbing avoiding and eliminating between the node.

For JT, owing to be the user device transmissions data jointly between the node, and the channel that data experienced of different node transmission is separate; If data between nodes is not carried out the adjustment of phase place; Then can't realize the relevant merging of transmission data between the node, can cause the decreased performance of cooperating, therefore; In order to realize the correlation reception of signal between the cooperative node, need be to carrying out phasing between the node.

Phasing between the existing node is based on node and carries out phasing, i.e. each node corresponding phase factor.This mode exists as follows in the multilayer transmission: the weights of different transport layer corresponding phase correction factors are different; Phase correction factor of each node feedback; Can't realize the correlation reception of different transport layers, thereby cause the different transport layers between the node can produce interference; If based on the comprehensive channel that forms between each cooperative node and UE; The overall channel that is promptly formed by a plurality of cooperative nodes is provided with phase correction factor, at this moment; Phase correction factor can't adapt to the adjustment of transmit leg to the cooperative node set; When the cooperative node set changes, cause the feedback phase correction factor can not adapt to the characteristic of new set, if be directed against different transport layer independent feedback phase correction factors respectively; Expense can be bigger on the one hand, also can't avoid the interference of different transport layers between different nodes simultaneously.

In the existing C SI report method; When adopting the JP mode to transmit; In order to realize the associated transport of signal between node; Subscriber equipment (UE, User Equipment) need report multipoint cooperative to report the precoding weights indication information of main service node and other each nodes in the set respectively and report phasing weights indication information that multipoint cooperative reports each node in the set to network side, and expense is big when causing UE to report CSI.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method and device, system of reporting status information of channel, to solve the big problem of expense that existing CSI reports mode to exist.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides the method for a kind of CSI of reporting, said method comprises:

Need carry out giving the correct time on the CSI, subscriber equipment (UE) reports to network side and is used for indicating the indication information of main service node precoding weights and/or is used to indicate multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

In such scheme, said method also comprises: said UE obtains said main service node precoding weights according to the channel matrix information of the main service node mode through the traversal code book.

In such scheme; Said method also comprises: said UE reports the channel matrix of each cooperative node in the node set and the precoding weights of said main service node according to acquired main service node channel matrix and multipoint cooperative, obtains the phasing weights that multipoint cooperative reports each cooperative node in the node set.

In such scheme, saidly obtain the phasing weights that multipoint cooperative reports each cooperative node in the node set, for:

The channel matrix that said UE reports each cooperative node in the node set according to the precoding weights and the multipoint cooperative of the channel matrix of said main service node, main service node; Obtain the error free phasing weights that multipoint cooperative reports each cooperative node in the node set; And the error free phasing weights of resultant each cooperative node are quantized to mate in the code book set at phasing, obtain the phasing weights of each cooperative node.

In such scheme, said method also comprises: according to the current transport layer of supporting, dispose respectively and the corresponding phasing code book set of said transport layer number at said UE and network side.

In such scheme, said method also comprises: said UE also to network side report channel quality indication (CQI) information of main service node, CQI information that multipoint cooperative reports each cooperative node in the set and in order indication (RI) information any one or multiple.

In such scheme, said method also comprises: said UE obtains the CQI of main service node based on the precoding weights of said main service node;

Said UE obtains the CQI of said each cooperative node based on the phasing weights that the precoding weights and the multipoint cooperative of said main service node reports each cooperative node in the node set.

In such scheme, said method also comprises: said UE also to network side report be used to indicate the current CSI of reporting based on the indication information of many cooperation transmission pattern.

In such scheme; Said method also comprises: said network side through special-purpose high-level signaling or through physical control channel indication UE report CSI based on many cooperation transmission pattern; Make said UE to report the CSI information corresponding to said network side according to the indicated many cooperation transmission pattern of network side with indicated multipoint cooperative transmission mode.

The present invention also provides a kind of device that is used to report CSI; Said device comprises: report the unit, be used for reporting to network side being used to indicate the indication information of main service node precoding weights and/or being used to indicate multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

In such scheme, said device also comprises: the first acquisition unit is used for obtaining said main service node precoding weights according to the channel matrix information of the main service node mode through the traversal code book.

In such scheme; Said device also comprises: the second acquisition unit; Be used for reporting the channel matrix of each cooperative node of node set and the precoding weights of said main service node, obtain the phasing weights that multipoint cooperative reports each cooperative node in the node set according to acquired main service node channel matrix and multipoint cooperative.

In such scheme, the said unit that reports, also be used for to network side report CQI information, the multipoint cooperative of main service node report the CQI information of each cooperative node of set and in the RI information any one or multiple.

In such scheme, said device also comprises: the 3rd acquisition unit, be used for precoding weights based on said main service node, and obtain the CQI of main service node; And/or, be used for the phasing weights that precoding weights and multipoint cooperative based on said main service node report each cooperative node of node set, obtain the CQI of said each cooperative node.

In such scheme, the said unit that reports, also be used for to network side report be used to indicate the current CSI of reporting based on the indication information of many cooperation transmission pattern.

The present invention also provides a kind of system that is used to report CSI, and said system comprises: network equipment and UE, wherein,

Network equipment comprises indicating member, be used for through special-purpose high-level signaling or physics control signaling indicate said UE report CSI based on many cooperation transmission pattern;

UE comprises and reports the unit, is used for the many cooperation transmission pattern according to said network equipment indication, reports the CSI information corresponding with indicated multipoint cooperative transmission mode to said network equipment;

Wherein, said CSI information comprises and is used in reference to the indication information that shows main service node precoding weights and/or is used for indicating multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

CSI report method of the present invention and device, system; When reporting CSI; UE can report multipoint cooperative to report the indication information of main service node precoding weights in the node set and/or the indication information that multipoint cooperative reports each cooperative node phasing weights in the node set to network side; Need not report multipoint cooperative to report the precoding weights of each cooperative node in the node set, thereby reduce the CSI feedback overhead greatly to network side.

In addition; Among the present invention; Channel matrix according to the precoding weights and the multipoint cooperative of main service node reports each cooperative node in the node set obtains the phasing weights that multipoint cooperative reports each cooperative node in the node set, thereby reports the phasing weights of each cooperative node in the node set and the number of plies of transmission to be mapped multipoint cooperative; Avoid different transport layers to adopt identical phasing weights and cause can't correlation reception problem; Phasing effect preferably can be realized, greater than 1 situation, the interference that different transport layer is brought between the node can also be effectively avoided for the transport layer number.

In addition, among the present invention, UE can also the indicated many cooperation transmission pattern of side Network Based report CSI, is convenient to the unification of JP and two kinds of feedback models of CS/CB.

Description of drawings

Fig. 1 reports the composition structural representation of the device of CSI for the present invention;

Fig. 2 reports CSI realization process flow chart in the embodiment of the invention.

Embodiment

Basic thought of the present invention is: when reporting CSI; Except reporting to channel quality indication (CQI) information and rank indication information; UE only need report the indication information of each cooperative node phasing weights in indication information and/or the many cooperation points set of main service node precoding weights to network side; And UE can only report at every turn in the above-mentioned information any one or multiple, through the mode that reports of the present invention, can reduce the CSI feedback overhead.

The CSI method that reports of the present invention; Mainly comprise: in the time of need reporting CSI, UE reports to network side and is used for indicating the indication information of main service node precoding weights and/or is used to indicate multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

Wherein, Described multipoint cooperative reports node set to be meant in the multipoint cooperative, need to carry out the node set that CSI reports; In practical application, main service node can be included in multipoint cooperative and report in the set, reports other nodes in the set for main service node of differentiation and multipoint cooperative in describing among the present invention; Multipoint cooperative is reported each node except that main service node in the node set, be defined as multipoint cooperative and report the cooperative node in the node set.

Here, said UE can pass through the mode of traversal code book according to the channel matrix information of main service node, obtains said main service node precoding weights.

Here; Said UE can also report the channel matrix of each cooperative node in the node set and the precoding weights of said main service node according to acquired main service node channel matrix and multipoint cooperative, obtains the phasing weights that multipoint cooperative reports each cooperative node in the node set.

Wherein, the channel matrix that UE can be through measuring main service node and the channel matrix of each cooperative node.

Particularly; The channel matrix that said UE reports each cooperative node in the node set according to the precoding weights and the multipoint cooperative of the channel matrix of said main service node, main service node; Obtain the error free phasing weights that multipoint cooperative reports each cooperative node in the node set; And the error free phasing weights of resultant each cooperative node are quantized to mate in the code book set at phasing, obtain the phasing weights of each cooperative node.

Here; According to the current transport layer of supporting; Dispose respectively and the set of the corresponding phasing quantification of said transport layer number code book at said UE and network side; So; The generation of described phasing quantification code book set is only relevant with the employed number of layers of transmission, can the error free phasing weights of resultant each cooperative node be gathered in the phasing quantification of corresponding current transmission layer number to mate, and obtains the phasing weights of each cooperative node; Thereby can be, and can avoid in the multilayer transmission between different nodes the interference of different transport layers and adapt to the cooperation set reporting the inconsistent scene of node set with multipoint cooperative so that the phasing weights are applicable to multilayer transmission.

Here, UE obtains multipoint cooperative and reports the process of the error free phasing weights of each cooperative node in the node set to be: UE obtains the equivalent channel of main service node according to the channel matrix of main service node and the precoding weights of main service node; Report the channel matrix of each cooperative node in the node set and the precoding weights of main service node according to multipoint cooperative again, obtain the equivalent channel that multipoint cooperative reports each cooperative node in the node set; At last, the equivalent channel according to the equivalent channel and the multipoint cooperative of resultant main service node reports each cooperative node in the node set obtains the error free phasing weights that multipoint cooperative reports each cooperative node in the node set.

Here; Said UE can also report the channel quality indication (CQI of main service node to network side; Channel Quality Index) information, multipoint cooperative report in CQI information and order indication (RI, Rank Index) information of each cooperative node in the set any one or multiple.

Wherein, the CQI of main service node can obtain based on the precoding weights of main service node, specifically can adopt the existing computational methods among the LTE R8 to calculate; The phasing weights that multipoint cooperative reports the CQI of each cooperative node in the node set to report each cooperative node in the node set based on the precoding weights and the multipoint cooperative of main service node obtain.

Here, said UE can also to network side report be used to indicate the current CSI of reporting based on the indication information of many cooperation transmission pattern, make said network side can know said UE report CSI based on many cooperation transmission pattern.

Particularly; Said UE can to network side report be used to indicate the current CSI of reporting based on the cooperation type indication (CTI of many cooperation transmission pattern; Cooperating Type Indication) information, with inform network side report CSI based on many cooperation transmission pattern.

Here, before network side reported the precoding weights of main service node and phasing weights that multipoint cooperative reports each cooperative node in the node set, said method can also comprise at UE:

Network side through special-purpose high-level signaling or physics control signaling indication UE report CSI based on many cooperation transmission pattern; Make said UE to report the CSI information corresponding to said network side according to the indicated many cooperation transmission pattern of network side with indicated multipoint cooperative transmission mode.

Particularly, UE carries out giving the correct time on the CSI based on the JP pattern in the network side indication, and UE reports the indication information of main service node precoding weights and the indication information that multipoint cooperative reports each cooperative node phasing weights in the node set to network side.If network side indication UE carries out CSI based on the CS/CB pattern and reports, then UE reports the indication information of main service node precoding weights to network side.

Accordingly; The present invention also provides a kind of device that is used to report CSI; As shown in Figure 1; Said device comprises: report the unit, be used for reporting to network side being used to indicate the indication information of main service node precoding weights and/or being used to indicate multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

Wherein, said device can also comprise: the first acquisition unit is used for obtaining said main service node precoding weights according to the channel matrix information of the main service node mode through the traversal code book.

Wherein, Said device can also comprise: the second acquisition unit; Be used for reporting the channel matrix of each cooperative node of node set and the precoding weights of said main service node, obtain the phasing weights that multipoint cooperative reports each cooperative node in the node set according to acquired main service node channel matrix and multipoint cooperative.

Wherein, the said unit that reports, can also be used for to network side report CQI information, the multipoint cooperative of main service node report the CQI information of each cooperative node of set and in the RI information any one or multiple.

Wherein, said device also comprises: the 3rd acquisition unit, be used for precoding weights based on said main service node, and obtain the CQI of main service node; And/or, be used for the phasing weights that precoding weights and multipoint cooperative based on said main service node report each cooperative node of node set, obtain the CQI that multipoint cooperative reports each cooperative node in the node set.

Particularly, the precoding weights of the said main service node that the 3rd acquisition unit obtains based on the first acquisition unit obtain the CQI of main service node; And/or; The precoding weights of the said main service node that the 3rd acquisition unit obtains based on the first acquisition unit and the multipoint cooperative that the second acquisition unit obtains report the phasing weights of each cooperative node in the node set, obtain the CQI that multipoint cooperative reports each cooperative node in the node set.

Wherein, the said unit that reports can also be used for reporting to network side being used to indicate the current indication information that reports the CSI of institute based on many cooperation transmission pattern.

In the practical application, above-mentionedly be used to report the device of CSI can be arranged on UE.

In addition; The present invention also provides a kind of system that is used to report CSI, and said system mainly comprises: network equipment and UE, wherein; Network equipment comprises indicating member, be used for through special-purpose high-level signaling or physics control signaling indicate said UE report CSI based on many cooperation transmission pattern; UE comprises and reports the unit, is used for the many cooperation transmission pattern according to said network equipment indication, reports the CSI information corresponding with indicated multipoint cooperative transmission mode to said network equipment; Wherein, said CSI information comprises and is used in reference to the indication information that shows main service node precoding weights and/or is used for indicating multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

Here, said network equipment can be base station, gateway, relay station, Microcell (pico cell) etc.

Here, said UE comprises the above-mentioned device that is used to report CSI.

Need to prove that among the present invention, the indication information of CSI is to carry out giving the correct time on the CSI at UE; Be used to indicate the information of corresponding CSI, be used to indicate the precoding weights of main service node like the indication information of above-mentioned main service node precoding weights, CQI information is used to indicate CQI; The indication information of each cooperative node phasing weights is used to indicate the phasing weights of each cooperative node; RI information is used to indicate RI, so, and in the practical application; Can report CSI through the mode of indication information, not need direct concrete value to report CSI information.

Embodiment one

In the present embodiment, the method that reports CSI according to the invention, as shown in Figure 2, the practical implementation process can be carried out according to following step:

Step 101, UE measures the channel information of multipoint cooperative measuring assembly, confirms to report the node set of CSI, confirms that promptly multipoint cooperative reports node set, and measures the channel matrix H of main service node _s, and said multipoint cooperative report the channel matrix H of each cooperative node in the node set _{C (i)}

Step 102, UE is according to the channel matrix H of the measured main service node that obtains _s, obtain the corresponding precoding weights of main service node.

Here, UE can be according to the channel matrix H of the measured main service node that obtains _sMode through the set of traversal precoding weights code book; Obtain the precoding weights of main service node, the RI decision that the precoding weights code book set of said traversal was reported by the last time, concrete; When current subframe reported RI (RI) and precoding weights information simultaneously, the RI to be reported by current subframe confirmed; When current subframe need not report RI; The RI that is reported by the last time determines; So, because actual employed transport layer number is by the RI decision, make that the set of precoding weights code book can be relevant with the employed transport layer number of plies of reality; Make the precoding weights be applicable to the multilayer transmission, and can avoid the interference of different transport layers between different nodes in the multilayer transmission.

In the practical application; Can be according to the transport layer of being supported; In the precoding weights code book set that UE and network side dispose corresponding each transport layer number of plies respectively, during the set of traversal code book, only need, the current precoding weights code book that uses the transport layer number of plies of correspondence travel through in gathering.For example; If the transport layer of being supported has 3; Then can dispose the precoding weights code book set 2 of the precoding weights code book set 1 of a corresponding transport layer, corresponding two transport layers and the precoding weights code book set 3 of corresponding three transport layers; If employed transport layer haves three layers during current transmission, then traversal obtains the precoding weights from precoding weights code book set 3.

Particularly, UE is according to the channel matrix H of main service node _s, according to formula (1) each weight w among the code book set c is traveled through, obtain the precoding weight w _Pmi

$w_{\mathrm{pmi}}=\underset{w\∈c}{\arg \max }\left|\right|H_{s}w\left|\right|---\left(1\right)$

Wherein, c gathers corresponding to code book, each weights that w representes among the c to be comprised, || || expression is asked norm to each w among the c, wherein, and the precoding weights of w that scope is maximum for obtaining.

Step 103, UE is according to the precoding weight w of resultant main service node _Pmi, and the multipoint cooperative that measures report the channel matrix H of each cooperative node in the set _{C (i)}, obtain the phasing weights that multipoint cooperative reports each cooperative node in the set.

Particularly, UE obtains multipoint cooperative and reports the process of phasing weights of each cooperative node in the set following:

The first, UE is by the channel matrix H of resultant main service node _s, multipoint cooperative reports the channel matrix H of each cooperative node in the set _{C (i)}, and the precoding weight w of main service node _Pmi, obtain the error free phasing weights β that multipoint cooperative reports each cooperative node in the set according to formula (2) _{C (i)}

β _c(i)＝f(H _s，w _pmi，H _c(i)) (2)

Particularly, UE is according to the channel matrix H of main service node _sWith the precoding weight w _Pmi, obtain the equivalent channel F of main service node by formula (3) _s

F _s＝H _sw _pmi (3)

UE reports the precoding weight w of the channel matrix and the main service node of each cooperative node in the set again according to multipoint cooperative _Pmi, obtain the equivalent channel F that multipoint cooperative reports each cooperative node in the set by formula (4) _{C (i)},

F _c(i)＝H _c(i)w _pmi (4)

UE reports the equivalent channel F of each cooperative node in the set again according to resultant multipoint cooperative _{C (i)}, and the equivalent channel F of main service node _s, obtain the error free phasing weights β that multipoint cooperative reports each cooperative node in the set according to formula (5) _{C (i)}

β _c(i)＝pinv(F _c(i))*F _s/norm(pinv(F _c(i))*F _s) (5)

Wherein, pinv (x) expression is asked pseudo-inverse operation to x, and norm (x) expression is asked norm to matrix or vector x.Here, because user's transport layer number of plies of cell edge can be too not high usually, so F _{C (i)}Dimension can be very not high yet, it is complicated that inversion operation also can be very, the β in the following formula _{C (i)}Dimension by the RI decision that is used for confirming the precoding weights, i.e. the order that transmission is to use is different, β _{C (i)}Corresponding dimension is also different; And RI is relevant with the current transport layer number of plies of supporting; Therefore need be according to the transport layer number of being supported; At receiving-transmitting sides, promptly UE and network side dispose the phasing code book set of the corresponding transport layer number of plies respectively, and the generation of described phasing code book set is only relevant with the number of layers that transmission is supported.

The second, UE reports the error free phasing weights β of each cooperative node in the set according to resultant multipoint cooperative _{C (i)}, obtain corresponding feedback index The feedback index

Be multipoint cooperative and report the phasing weights of each cooperative node in the set.

Here, UE reports multipoint cooperative the error free phasing weights β of each cooperative node in the set _{C (i)}, quantize to mate in the code book set at phasing, obtain corresponding feedback index

Particularly, can report the error free phasing weights β of each node in the set to multipoint cooperative according to formula (5) _{C (i)}Ask norm, the β that norm is maximum _{C (i)}Be the feedback index

${\widetilde{\mathrm{\β}}}_{c\left(i\right)}=\underset{\widetilde{\mathrm{\β}}\∈v}{\arg \max }\left|\right|{\mathrm{\β}}_{c\left(i\right)}{\widetilde{\mathrm{\β}}}^H\left|\right|---\left(6\right)$

Wherein, V is corresponding to the phasing code book set that quantizes; Each weights that is comprised among expression v, the pairing phasing set of v is confirmed by RI.|| x|| representes x is asked norm.

The UE side when carrying out the CSI feedback at every turn; At first confirm RI or the RI that reports according to the last time according to channel information; Confirm pairing phasing code book set in the phasing code book matching process, for example, if 4 layers of transmission of maximum support; Receiving-transmitting sides then, promptly UE and network side are proofreaied and correct the code books set to 1 layer, 2 layers, 3 layers, 4 layers configuration phase respectively; The RI that reports in the last time, or the RI that newly confirms according to channel information be 2 o'clock, then selecting number of layers is 2 corresponding phasing code books set, this moment, v was the phasing code book set of 2 o'clock quantification corresponding to number of layers.

In the practical application, based on the above-mentioned phasing weights that obtain, after handling, the form that obtains receiving signal is suc as formula shown in (7).

$y=(H_s{w}_{\mathrm{pmi}}+H_{c\left(i\right)}{w}_{\mathrm{pmi}}{\widetilde{\mathrm{\β}}}_{c\left(1\right)}+\·\·\·+H_{c\left(k\right)}{w}_{\mathrm{pmi}}{\widetilde{\mathrm{\β}}}_{c\left(k\right)})S$

$=(F_s+F_{c\left(1\right)}{\widetilde{\mathrm{\β}}}_{c\left(1\right)}+\·\·\·+F_{c\left(k\right)}{\widetilde{\mathrm{\β}}}_{c\left(k\right)})S---\left(7\right)$

Wherein, S representes the useful signal of network side emission.

Under the situation of not considering quantization error, then can find out, according to the above-mentioned phasing weights that obtain, the phasing that can realize ideal by formula (7) Wherein, α _{C (i)}For multipoint cooperative reports in the set node with respect to the channel power scale factor of main service node, Can report the ratio between the equivalent channel of product and main service node of equivalent channel and phasing weights of each node in the set for multipoint cooperative.

Step 104, UE is based on the above-mentioned phasing weights that obtain And precoding weight w _Pmi, obtain the CQI of main service node and the CQI that multipoint cooperative reports each cooperative node in the set;

Particularly, the multipoint cooperative CQI that reports each node in the set based on

Promptly main service node precoding weight w _PmiPhasing weights with node

Calculate, the CQI of main service node calculates the existing computational methods that adopt among the LTE R8 and calculates, promptly based on main service node precoding weight w _PmiCalculate.

For ease of understanding, can simply illustrate the difference of calculating CQI under two kinds of situation.In traditional mode, be example with main service node, according to channel information H _sWith the precoding weight w _Pmi, at first calculate F _s=H _sw _Pmi, and further based on F _sIn conjunction with the receiver detection algorithm; Merge reception (MRC, Maximal Ratio Combining), least mean-square error (MMSE like high specific; Minimum Mean Square Error); Least mean-square error-interference rejection merges (MMSE-IRC, Minimum Mean Square Error-Interference rejection combining), calculates the CQI under the corresponding receiver algorithm.And report each cooperative node in the set for multipoint cooperative, this moment CQI computational methods be

CQI of the utilization algorithm computation cooperative node identical based on

afterwards with traditional approach.

Step 105, UE reports the indication information of CSI based on the current multipoint cooperative transmission mode that adopts to network side.

Particularly, under the JT pattern, UE can comprise to the CSI indication information that network side reports: the precoding weights indication information w of RI, main service node _PmiIndication information and CQI information and multipoint cooperative report each cooperative node phasing weights in the set

Indication information and CQI information.

Under the CS/CB pattern, UE comprises to the CSI that network side reports: the precoding weight w of RI, main service node _PmiIndication information and CQI information and the multipoint cooperative indication information and the CQI information that report each cooperative node precoding weights in the set.

Need to prove, on to above-mentioned channel condition information, give the correct time that all information can not report in same subframe.

In the present embodiment, when UE reported CSI, UE can also increase CTI information in the CSI that reports, when informing network side feedback CSI based on many cooperation transmission pattern.

Here, CTI information can be set take 1bit or 2bit, it is identical with the cycle of RI that the report cycle of CTI information can be configured to, and so, reporting of CTI information can be very not frequent, can effectively reduce expense.

The multipoint cooperative transmission mode that need adopt when perhaps, indicating UE to report CSI through the high-level signaling of special use by network side.

Particularly, network side can carry the information that is used to indicate the multipoint cooperative transmission mode through in sending to the special-purpose high-level signaling of UE, increasing the field of 1bit or 2bit in this field.Preferably, this is used for indicating the information-bearing of multipoint cooperative transmission mode to report configuration (CQI-ReportConfig) cell at CQI.

Perhaps, can be before UE report CSI, the multipoint cooperative transmission mode that need adopt when indicating user equipment to report CSI by network side through Physical Downlink Control Channel so, can be a user device configuration multipoint cooperative transmission mode more flexibly.

Particularly, network side can carry the information that is used to indicate the multipoint cooperative transmission mode through in physical down control signaling, increasing the field of 1bit or 2bit in this field.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims (16)

1. the method for a reporting status information of channel (CSI) is characterized in that, said method comprises:

Need carry out giving the correct time on the CSI, subscriber equipment (UE) reports to network side and is used for indicating the indication information of main service node precoding weights and/or is used to indicate multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

2. according to the said method that reports CSI of claim 1, it is characterized in that said method also comprises:

Said UE obtains said main service node precoding weights according to the channel matrix information of the main service node mode through the traversal code book.

3. according to claim 1 or the 2 said methods that report CSI, it is characterized in that said method also comprises:

Said UE reports the channel matrix of each cooperative node in the node set and the precoding weights of said main service node according to acquired main service node channel matrix and multipoint cooperative, obtains the phasing weights that multipoint cooperative reports each cooperative node in the node set.

4. according to the said method that reports CSI of claim 3, it is characterized in that, saidly obtain the phasing weights that multipoint cooperative reports each cooperative node in the node set, for:

The channel matrix that said UE reports each cooperative node in the node set according to the precoding weights and the multipoint cooperative of the channel matrix of said main service node, main service node; Obtain the error free phasing weights that multipoint cooperative reports each cooperative node in the node set; And the error free phasing weights of resultant each cooperative node are quantized to mate in the code book set at phasing, obtain the phasing weights of each cooperative node.

5. according to the said method that reports CSI of claim 4, it is characterized in that said method also comprises:, dispose respectively and the corresponding phasing code book set of said transport layer number at said UE and network side according to the current transport layer of supporting.

6. according to the said method that reports CSI of claim 1, it is characterized in that said method also comprises:

Said UE also to network side report channel quality indication (CQI) information of main service node, CQI information that multipoint cooperative reports each cooperative node in the set and in order indication (RI) information any one or multiple.

7. according to the said method that reports CSI of claim 6, it is characterized in that said method also comprises:

Said UE obtains the CQI of main service node based on the precoding weights of said main service node;

Said UE obtains the CQI of said each cooperative node based on the phasing weights that the precoding weights and the multipoint cooperative of said main service node reports each cooperative node in the node set.

8. according to each said method that reports CSI of claim 1 to 7, it is characterized in that said method also comprises:

Said UE also to network side report be used to indicate the current CSI of reporting based on the indication information of many cooperation transmission pattern.

9. according to each said method that reports CSI of claim 1 to 7, it is characterized in that said method also comprises:

Said network side through special-purpose high-level signaling or through physical control channel indication UE report CSI based on many cooperation transmission pattern; Make said UE to report the CSI information corresponding to said network side according to the indicated many cooperation transmission pattern of network side with indicated multipoint cooperative transmission mode.

10. device that is used to report CSI; It is characterized in that; Said device comprises: report the unit, be used for reporting to network side being used to indicate the indication information of main service node precoding weights and/or being used to indicate multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

11. according to the said device that is used to report CSI of claim 10; It is characterized in that; Said device also comprises: the first acquisition unit is used for obtaining said main service node precoding weights according to the channel matrix information of the main service node mode through the traversal code book.

12. according to the said device that is used to report CSI of claim 11; It is characterized in that; Said device also comprises: the second acquisition unit; Be used for reporting the channel matrix of each cooperative node of node set and the precoding weights of said main service node, obtain the phasing weights that multipoint cooperative reports each cooperative node in the node set according to acquired main service node channel matrix and multipoint cooperative.

13. according to the said device that is used to report CSI of claim 10; It is characterized in that; The said unit that reports, also be used for to network side report CQI information, the multipoint cooperative of main service node report the CQI information of each cooperative node of set and in the RI information any one or multiple.

14., it is characterized in that said device also comprises according to the said device that is used to report CSI of claim 13: the 3rd acquisition unit, be used for precoding weights based on said main service node, obtain the CQI of main service node; And/or, be used for the phasing weights that precoding weights and multipoint cooperative based on said main service node report each cooperative node of node set, obtain the CQI of said each cooperative node.

15. according to each said device that is used to report CSI of claim 10 to 14, it is characterized in that, the said unit that reports, also be used for to network side report be used to indicate the current CSI of reporting based on the indication information of many cooperation transmission pattern.

16. a system that is used to report CSI is characterized in that, said system comprises: network equipment and UE, wherein,

Network equipment comprises indicating member, be used for through special-purpose high-level signaling or physics control signaling indicate said UE report CSI based on many cooperation transmission pattern;

UE comprises and reports the unit, is used for the many cooperation transmission pattern according to said network equipment indication, reports the CSI information corresponding with indicated multipoint cooperative transmission mode to said network equipment;

Wherein, said CSI information comprises and is used in reference to the indication information that shows main service node precoding weights and/or is used for indicating multipoint cooperative to report the indication information of each cooperative node phasing weights of node set.

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