CN101931513A - Channel state information feedback method and user equipment - Google Patents
Channel state information feedback method and user equipment Download PDFInfo
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Abstract
The invention provides a channel state information feedback method and user equipment (UE), and the method comprises the following steps: leading the UE to determine a first class pre-coding matrix index or the first class pre-coding matrix index and a second class matrix index according to indication information, wherein the first class pre-coding matrix index is used for indicating an index of a first class pre-coding matrix in a configured set of first class pre-coding codes, and the second class matrix index is used for indicating the index of a second class matrix in the configured set of second class codes; leading the UE to calculate channel quality information (CQI) according to the determined first class pre-coding matrix index; and leading the UE to send the calculated CQI to the base station or leading the calculated CQI and the determined first class pre-coding matrix index and/or the second class matrix index to the base station, wherein the first class pre-coding matrix is used for mapping channel information of a broad band and/or a long-term channel, and the second class matrix is used for mapping the channel information of a sub-band and/or a short-term channel.
Description
Technical field
The present invention relates to the mobile communication technology field, in particular to a kind of feedback method of channel status information and terminal.
Background technology
Senior Long Term Evolution (Long Term Evolution Advanced, abbreviating LTE-A as) system is as Long Term Evolution (Long term evolution, abbreviate LTE as) evolution standard, support bigger system bandwidth (reaching as high as 100MHz), and the existing standard of backward compatibility LTE.For covering and the throughput that improves cell edge, LTE-A is on the basis of prior LTE system, a kind of cooperation multiple-input and multiple-output (Multiple Input Multiple Output has been proposed, abbreviate MIMO as) technology, be called multipoint cooperative transmission (COMP) technology again, the availability of frequency spectrum, alleviation frequency spectrum resource that this technology can improve international mobile communication (International Mobile Telecommunications-Advance the abbreviates IMT-Advance as) system of evolution are in short supply.
In radio communication, if use many antennas, can take the mode of spatial reuse to improve transmission rate, i.e. the different data of the emission of different antennae position on the identical running time-frequency resource of transmitting terminal at transmitting terminal (as node eNB).(as user terminal UE) also uses many antennas at receiving terminal, a kind of situation is under single user's situation the resource of all antennas all to be distributed to same user, promptly a subscriber equipment occupies the physical resource of distributing to described subscriber equipment alone in a transmission intercal, and this transmission form is called SU-MIMO (Single User MIMO); Another kind of situation is to give different user with the resource allocation in different antennae space under multi-user's situation, promptly a subscriber equipment and at least one other subscriber equipment are shared the physical resource of distributing to these subscriber equipmenies in a transmission intercal, a subscriber equipment and other subscriber equipment are shared same physical resource by space division multiple access or space division multiplexing mode, this physical resource can be a running time-frequency resource, and this transmission form is called MU-MIMO (multiuser MIMO).
Long Term Evolution (Long termEvolution at third generation partner program normal structure 3GPP, abbreviate LTE as) in, UE transmits based on following a kind of transmission mode (transmission mode) by semi-static being set to of high-level signaling (semi-statically), as:
Pattern 1: single antenna port: port 0 (Single-antenna port:port 0);
Pattern 2: transmit diversity (Transmit diversity);
Mode 3: Open-Loop Spatial Multiplexing (Open-loop spatial multiplexing);
Pattern 4: Closed-Loop Spatial Multiplexing (Closed-loop spatial multiplexing);
Pattern 5: multi-user's multiple-input and multiple-output (Multi-user MIMO);
Pattern 6: closed loop Rank=1 precoding (Closed-loop Rank=1 precoding);
Mode 7: single antenna port: port 5 (Single-antenna port:port 5).
User terminal UE feeds back different channel condition informations according to different transmission modes to transmitting terminal, transmitting terminal (eNB) is dispatched according to the channel condition information that terminal (UE) is fed back again then, and is used for actual transmissions according to the new channel condition information of certain principle (as the heap(ed) capacity principle) configuration.Wherein, the channel condition information of feedback comprises: channel quality indication (Channel quality indication, abbreviate CQI as) information, precoding matrix indicators (Precoding Matrix Indicator, abbreviate PMI as) information and order designator (Rank Indicator abbreviates RI as) information.
CQI is for weighing an index of down channel quality quality.CQI represents with 0～15 integer value in the 36-213 agreement, has represented different CQI grades respectively, and different CQI correspondences modulation system and encoder bit rate (MCS) separately.
RI is used to describe the number of space independent channel, the order of respective channels response matrix.Under Open-Loop Spatial Multiplexing and Closed-Loop Spatial Multiplexing pattern, need UE feedback RI information, do not need to feed back RI information under other patterns.
PMI refers to the call number of the precoding codebook of UE feedback.Under these 3 kinds of patterns of closed loop of Closed-Loop Spatial Multiplexing, MU-MIMO, RI=1, need feedback PMI information, do not feed back PMI information under other emission modes.
The CQI definition that occurs among the LTE is various, according to different principles, CQI can be divided:
● be divided into wideband CQI and subband CQI according to measuring bandwidth
Wideband CQI refers to the channel status indication to all subband, and what obtain is the CQI information of subband S set;
Subband CQI pointer is to the CQI information of each subband.LTE is according to different system bandwidths, and the RB (Resource Block, Resource Block) of effective bandwidth correspondence has been divided into several RB groups, and each RB group is referred to as subband, i.e. subband.
Subband CQI can be divided into full subband CQI and Best M CQI again: full subband CQI reports the CQI information of all subbands; Best M CQI selects M subband from sets of subbands S, report the CQI information of this M subband, and reports the positional information of M subband simultaneously.
● be divided into single current CQI and double-current CQI according to the code stream number
Single current CQI: be applied to single-antenna transmission port 0, the Closed-Loop Spatial Multiplexing of port 5, transmit diversity, MU-MIMO, RI=1, this moment, UE reported the CQI information of single code stream;
Double fluid CQI: be applied to the Closed-Loop Spatial Multiplexing pattern.For the Open-Loop Spatial Multiplexing pattern, because channel condition information the unknown, and in precoding, double-current channel information has been carried out equilibrium treatment, so under the Open-Loop Spatial Multiplexing, the CQI of 2 code streams equates.
● be divided into absolute value CQI and differential CQI according to the CQI method for expressing
The CQI index that absolute value CQI promptly represents with 4 bit;
Differential CQI is a differential CQI, the CQI index that represents with 2bit or 3bit; Differential CQI is divided into the 2nd code stream again with respect to the differential CQI of the 1st code stream, the subband CQI differential CQI with respect to subbandCQI.
● according to CQI report mode be divided into wideband CQI, UE selected (subband CQI),
High?layer?configured(subband?CQI)
Wideband CQI refers to the CQI information of subband S set;
UE selected (subband CQI) is Best M CQI, feeds back the CQI information of a selected M subband, reports the position of M subband simultaneously;
High layer configured (subband CQI) is full subband CQI, at CQI information of each subband feedback.
High layer configured and UE selected all are feedback systems of subband CQI, under the aperiodic feedback model, and not of uniform size the causing of subband of these two kinds of feedback systems definition; Under UE selected pattern, also defined the size of M, see Table 1 and table 2.
Table 1: subband size [high-rise configuration mode]
Table 2: subband size and M value [user's preference pattern]
In the LTE system, CQI/PMI, the feedback of RI can be periodic feedback, also can be acyclic feedback, concrete feedback is as shown in table 3:
Table 3 periodic feedback and the corresponding uplink physical channel of aperiodicity feedback
| Scheduling method | Periodicity CQI reporting channel | Aperiodicity CQI reporting channel |
| Frequency is non-selective | ?PUCCH | |
| Frequency selectivity | ?PUCCH | ?PUSCH |
Wherein, for CQI/PMI, the RI of periodic feedback, if UE does not need to send data, then the CQI/PMI of periodic feedback, RI go control channel (Physical Uplink ControlChannel physically, PUCCH) go up transmission with form 2/2a/2b (PUCCH format2/2a/2b), if when UE need send data, CQI/PMI then, the capable physically shared channel of RI (Physical UplinkShared Channel, PUSCH) middle transmission; For CQI/PMI, the RI of aperiodicity feedback, only on PUSCH, transmit.
According to the semi-static configuration of high level, UE is periodic feedback CQI/PMI/RI information on the PUCCH physical channel, and the feedback model of employing is as shown in table 4.
Table 4
Do not support high-rise configuration Higher Layer configured-(Subband CQI) feedback and Multiple PMI feedback on the PUCCH channel.
In multiaerial system, directly the overhead bit of feedback channel response matrix is too big, perhaps channel response matrix is carried out decomposition such as SVD, feeds back thereby draw best pre-coding matrix, and its expense is still very big.Therefore need all known precoding codebook set in some sending and receiving ends of structure, encoder matrix in the best pre-coding matrix that obtains and the precoding codebook set is compared, the precoding codebook corresponding index value is fed back like selecting recently, can save overhead bit greatly like this.The index value of the precoding codebook of these feedbacks is exactly PMI.
The feedback granularity of PMI can be PMI of whole bandwidth feedback, also can feed back PMI according to subband subband, has defined two kinds of PMI feedback kind in the LTE agreement: single PMI and multiplePMI.Single PMI can represent whole system effective bandwidth
Also can represent a part of RB subclass, the RB number that single PMI represents is by the semi-static configuration of high level.
Periodically the user selects under UE selected (subband CQI) feedback model, has introduced a new ideas bandwidth and has divided Bandwidth part, abbreviates BP as.BP is made of several subband, wherein subband in the mode of frequency increments from the peak low band open numbering, but the size of subband (the RB number that promptly comprises) is followed nonincremental mode; Same, BP also be mode with frequency increments from the peak low band open numbering, but the size of BP (the subband number that promptly comprises) is followed nonincremental mode.Relation between three kinds of the subband sizes under the periodic feedback pattern, BP size, system bandwidth is as shown in table 5:
Table 5
It is as shown in table 5,
The expression system bandwidth, if
Then do not support UE selected (subbandCQI) feedback model; Corresponding to system bandwidth
The subband number be
Wherein have
Individual subband size is k, if
The size of certain subband is
J is the number of BP, BPj, and j=0,1 ..., J-1 is by the continuous N of frequency
jIndividual subband is formed.If J=1, then
If J＞1, then
Or
BPj with consecutive order according to equation j=mod (N
SF, J) scan.N
SFBe the counter of UE end, after each subband among the BP reported transmission, this counter added 1; Under UEselected (subband CQI) feedback model, from the N of BP
jSelect a son to bring the row feedback in the individual subband, use
Bit represents.
At present, by certain bit number (as 4 bits) feeding back channel state information, be primarily aimed at the transmission mode of Single User MIMO, thereby feedback information is simple in the correlation technique, precision of information is less.And along with development communication technologies, be applied to the transmission mode of the dynamic switching of Single User MIMO and multiuser MIMO among the LTE-A more and more widely, under this transmission mode, the content and the precision of channel condition information to feedback all had higher requirement, use original feedback method can not satisfy the demand of LTE-A system, the transmission mode of dynamic switching that especially can't satisfy Single User MIMO and multiuser MIMO is to the high-precision requirement of channel condition information.
Summary of the invention
Main purpose of the present invention is to provide a kind of feedback method of channel status information and terminal, to solve the demand of using original feedback method can not satisfy the LTE-A system in the correlation technique, the transmission mode of dynamic switching that especially can't satisfy Single User MIMO and multiuser MIMO is to the high-precision requirement of channel condition information.
In order to solve the problems of the technologies described above, the present invention proposes a kind of feedback method of channel status information, and user terminal (UE), comprising to the base station feedback channel condition information according to indication information:
UE determines first kind pre-coding matrix index according to described indication information, the perhaps first kind pre-coding matrix index and the second matroid index, wherein first kind pre-coding matrix index is used for indicating the index of first kind pre-coding matrix in the first kind precoding codebook set of configuration, and the second matroid index is used for indicating the index of second matroid in the second class code book set of configuration;
UE is according to described definite first kind pre-coding matrix index calculating channel quality information (CQI);
UE is sent to the base station with the CQI that calculates, and perhaps with the CQI that calculates, and first kind pre-coding matrix index and/or the described second matroid index determined are sent to the base station;
Wherein, described first kind pre-coding matrix is used to shine upon the channel information of broadband and/or long-term channel, and described second matroid is used to shine upon the channel information of subband and/or short-term channel.
Further, above-mentioned feedback method also can have following characteristics:
Described UE is according to described indication information, determine the feedback model of described UE earlier, then according to the definite channel condition information of described definite feedback model to base station feedback, described channel condition information comprises CQI, perhaps CQI and definite first kind pre-coding matrix index and/or described second matroid index.
Further, above-mentioned feedback method also can have following characteristics:
Described indication information is the high-rise configuration signal information that the base station sends.
Further, above-mentioned feedback method also can have following characteristics:
Described CQI comprises broadband CQI and/or subband CQI.
Further, above-mentioned feedback method also can have following characteristics:
Described UE also comprises order indicator information (RI) according to described indication information in the channel condition information of base station feedback.
Further, above-mentioned feedback method also can have following characteristics:
Terminal also needs to determine first kind pre-coding matrix index according to the value of up-to-date RI, the perhaps first kind pre-coding matrix index and the second matroid index, and calculate CQI.
Further, above-mentioned feedback method also can have following characteristics:
Terminal also needs to come the calculating channel quality information according to the matrix of up-to-date order designator and first kind pre-coding matrix index correspondence; Perhaps
Terminal also needs the matrix according to up-to-date order designator, first kind pre-coding matrix index correspondence, and second matroid of an appointment comes the calculating channel quality information.
Further, above-mentioned feedback method also can have following characteristics:
UE comprises according to described definite first kind pre-coding matrix index calculating channel quality information:
UE is according to the matrix computations CQI of described definite first kind pre-coding matrix index correspondence, perhaps
UE calculates CQI according to the matrix of described definite first kind pre-coding matrix index correspondence and second matroid of an appointment.
In order to solve the problems of the technologies described above, the present invention also proposes a kind of terminal, is used for according to indication information to the base station feedback channel condition information, and this terminal comprises determination module and feedback module, wherein:
Described determination module, in order to determine first kind pre-coding matrix index according to indication information, the perhaps first kind pre-coding matrix index and the second matroid index; And according to described definite first kind pre-coding matrix index calculating channel quality information (CQI);
Described feedback module is sent to the base station in order to the CQI that described determination module is calculated, the perhaps CQI that described determination module is calculated, and first kind pre-coding matrix index and/or the described second matroid index determined are sent to the base station;
Wherein, first kind pre-coding matrix index is used for indicating the index of first kind pre-coding matrix in the first kind precoding codebook set of configuration, and the second matroid index is used for indicating the index of second matroid in the second class code book set of configuration; Described first kind pre-coding matrix is used to shine upon the channel information of broadband and/or long-term channel, and described second matroid is used to shine upon the channel information of subband and/or short-term channel.
Further, above-mentioned terminal also can have following characteristics:
Described determination module, according to described indication information, determine the feedback model of described UE earlier, then according to the definite channel condition information of described definite feedback model to base station feedback, described channel condition information comprises CQI, perhaps CQI and definite first kind pre-coding matrix index and/or described second matroid index.
Further, above-mentioned terminal also can have following characteristics:
Described indication information is the high-rise configuration signal information that the base station sends.
Further, above-mentioned terminal also can have following characteristics:
Described CQI comprises broadband CQI and/or subband CQI.
Further, above-mentioned terminal also can have following characteristics:
Described determination module is in order to determine order indicator information (RI) according to described indication information;
Described feedback module also is sent to the base station in order to the RI that described determination module is determined.
Further, above-mentioned terminal also can have following characteristics:
Described determination module also needs to determine first kind pre-coding matrix index according to the value of up-to-date order designator, the perhaps first kind pre-coding matrix index and the second matroid index, and calculate CQI.
Further, above-mentioned terminal also can have following characteristics:
Described determination module calculates CQI according to the matrix of up-to-date order designator and first kind pre-coding matrix index correspondence; Perhaps according to the matrix of up-to-date order designator, first kind pre-coding matrix index correspondence, and second matroid of an appointment calculates CQI.
Further, above-mentioned terminal also can have following characteristics:
Described determination module comprises according to described definite first kind pre-coding matrix index calculating channel quality information:
Described determination module according to the matrix computations CQI of described definite first kind pre-coding matrix index correspondence, perhaps calculates CQI according to the matrix of described definite first kind pre-coding matrix index correspondence and second matroid of an appointment.
The method and the terminal of a kind of channel condition information feedback provided by the invention, can feed back the first kind pre-coding matrix index and second matroid index and the channel quality information neatly as required, thereby improved the precision of the channel condition information of UE feedback, simplify computational process, make the base station dynamically, simply to select the transmission of Single User MIMO or multiuser MIMO, thereby improved systematic function significantly according to actual channel condition.
Description of drawings
Fig. 1 is the method flow diagram of a kind of channel condition information feedback of the embodiment of the invention;
Fig. 2 is embodiment of the invention base station and terminal interaction, the flow chart of terminal feeding back channel state information;
Fig. 3 is that a kind of terminal of the embodiment of the invention is formed structural representation.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
In order to understand the present invention, below at first the channel condition information of UE feedback in the embodiment of the invention is done to introduce.
At first, first kind precoding codebook set that share inventive embodiments structure sending and receiving end and the set of the second class code book, comprise a plurality of matrixes in the described first kind precoding codebook set, be used to select shine upon the first kind pre-coding matrix of the channel information of broadband and/or long-term channel, comprise a plurality of matrixes in the described second class code book set, be used to select shine upon second matroid of the channel information of subband and/or short-term channel, thereby improved the precision of channel condition information.
Secondly, the channel condition information in the embodiment of the invention can comprise pre-coding matrix index, order designator and channel quality information.
By feedback method of the present invention, make the base station to select the transmission of Single User MIMO or multiuser MIMO dynamically, simply according to actual channel condition, can improve systematic function significantly.
Preferably, the embodiment of the invention is raised the efficiency in order to simplify calculating, and the first kind pre-coding matrix index of selecting of giving chapter and verse comes the calculating channel quality information.Described channel quality information comprises broad-band channel quality information and/or sub-band channel quality information.
In conjunction with the above-mentioned ingenious design of the present invention, for a UE, on a subband, a first kind pre-coding matrix index (being referred to as first kind PMI1 in being described below) and the second matroid index (being referred to as the second class PMI2 in being described below) are all arranged, first kind PMI1 indicates a pre-coding matrix W1, and the second class PMI2 indicates another matrix W 2.A pre-coding matrix W is the function of two matrix W 1 and W2, and W1 belongs to code book C1, and W2 belongs to code book C2.First kind PMI1 is the index of W1 in code book C1, and the second class PMI2 is the index of W2 in code book C2, and wherein W1 has shone upon the channel information of broadband and/or long-term channel, and W2 has shone upon the channel information of subband and/or short-term channel.
Referring to Fig. 1, the figure shows the embodiment of the invention and adopt above-mentioned design terminal to carry out the method for channel condition information feedback, comprising:
Step S101:UE determines first kind pre-coding matrix index according to indication information, perhaps the first kind pre-coding matrix index and the second matroid index;
Described indication information is the high-rise configuration signal information that the base station sends;
Described UE is according to described indication information, determine the feedback model of described UE earlier, then according to the definite channel condition information of described definite feedback model to base station feedback, described channel condition information comprises CQI, perhaps CQI and definite first kind pre-coding matrix index and/or described second matroid index.
Wherein, first kind pre-coding matrix index is used for indicating the index of first kind pre-coding matrix in the first kind precoding codebook set of configuration, and the second matroid index is used for indicating the index of second matroid in the second class code book set of configuration; Described first kind pre-coding matrix is used to shine upon the channel information of broadband and/or long-term channel, and described second matroid is used to shine upon the channel information of subband and/or short-term channel;
Step S102:UE calculates CQI according to described definite first kind pre-coding matrix index;
UE can comprise according to described definite first kind pre-coding matrix index calculating channel quality information: UE is according to the matrix computations CQI of described definite first kind pre-coding matrix index correspondence; Perhaps UE calculates CQI according to the matrix of described definite first kind pre-coding matrix index correspondence and second matroid of an appointment;
Described CQI comprises broadband CQI and/or subband CQI;
Step S103:UE is sent to the base station with the CQI that calculates, and perhaps with the CQI that calculates, and first kind pre-coding matrix index and/or the described second matroid index determined are sent to the base station.
In another embodiment, described UE can also comprise order indicator information (RI) according to described indication information in the channel condition information of base station feedback.Preferably, terminal will be determined first kind pre-coding matrix index according to the value of up-to-date order designator, the perhaps first kind pre-coding matrix index and the second matroid index, and calculate CQI.Specifically, terminal can be come the calculating channel quality information according to the matrix of up-to-date order designator and first kind pre-coding matrix index correspondence; Perhaps according to the matrix of up-to-date order designator, first kind pre-coding matrix index correspondence, and second matroid of an appointment comes the calculating channel quality information.
Referring to Fig. 2, this figure shows base station and terminal interaction on the whole, and the flow process of terminal feeding back channel state information comprises:
Step S201: the base station sends pilot tone to UE, is used for UE test down channel state;
Step S202:UE estimates down channel according to the pilot frequency information that receives;
Step S203:UE adopts the above-mentioned terminal of the embodiment of the invention to carry out the method for channel condition information feedback, and channel condition information is fed back to the base station;
Described channel condition information can comprise order designator RI information, CQI and PMI; Wherein, PMI comprises the first kind PMI1 and the second class PMI2; The calculating of CQI is based on that first kind PMI1 obtains;
Step S204: dispatch according to the channel condition information of UE feedback the base station, realizes the transmission that Single User MIMO or multiuser MIMO or Single User MIMO and multiuser MIMO dynamically switch.
Below in conjunction with concrete application scenarios embodiment of the present invention is described.
Application example one
At the PUSCH channel, in same sub transmit selected precoding designator PMI1 and matrix designator PMI2 when feeding back aperiodic, and the CQI feedback system is the broadband feedback, and PMI that UE reports and the value of CQI are that condition is calculated with the RI that one-period reports on it, comprising:
RI＜=2 o'clock, UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, and transmission is to carry out on sets of subbands S;
For each subband, UE selects the matrix W 2 of an optimum from code book C2, determine the index PMI2 of described W2 in code book C2, and transmission is based on by the common pre-coding matrix W that generates of W1 and W2, and transmission is only carried out on selected subband subclass S;
UE reports broadband CQI value for each code word, and the CQI value is based on, and the pairing matrix W 1 of determined pre-coding matrix index PMI1 calculates;
UE reports the index PMI value of selected single pre-coding matrix W1;
UE reports the index PMI value of selected matrix W 2 for each subband among each sets of subbands S.
RI＞2 o'clock, UE carries out:
For each subband, first-selected pre-coding matrix W1 chooses in codebook subset C1, determines the index PMI1 of described W1 in code book C1, and transmission is only carried out in this subband;
Determine that W2 is the particular matrix of an acquiescence, determine the index PMI2 of described W2 in code book C2, and transmission is based on W1 and the common W that generates of W2 carries out;
UE should report the broadband CQI value of each code word, the CQI value is calculated by use the pairing matrix of fixed pre-coding matrix W1 index PMI1 in each subband, perhaps, the CQI value is by using the pairing matrix of pre-coding matrix W1 index PMI1 selected and the particular matrix W2 of acquiescence to calculate in each subband, and transmission is to carry out on the S subband set;
For each subband set S, UE should report the pre-coding matrix W1 index PMI value of having selected.
Application example two
At the PUSCH channel, in subframe transmit selected precoding designator PMI1 when feeding back aperiodic, and the CQI feedback system is high-rise configuration subband feedback, and CQI that UE reports and PMI value are that condition is calculated with the RI that one-period reports on it, and UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, and transmission is to carry out on sets of subbands S;
UE reports a subband CQI value for each code word on each sets of subbands S, and the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, and transmission is to carry out on corresponding subband;
UE reports a broadband CQI value for each code word, and the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, and transmission is to carry out on sets of subbands S;
UE reports selected single pre-coding matrix W1 indication index PMI1.
Application example three
At the PUSCH channel, in same sub transmit selected precoding designator PMI1 and matrix designator PMI2 when feeding back aperiodic, and the CQI feedback system is high-rise configuration subband feedback.CQI that UE reports and PMI value are that condition is calculated with the RI that reports.UE carries out:
RI＜=2 o'clock, UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, and transmission is to carry out on sets of subbands S;
For each subband, UE selects the matrix W 2 of an optimum from code book C2, determine the index PMI2 of described W2 in code book C2, and transmission is based on by the common pre-coding matrix W that generates of W1 and W2, and transmission is only carried out on selected subband subclass S;
UE reports a subband CQI value for each code word on each sets of subbands S, and the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, and transmission is to carry out on corresponding subband;
UE reports a broadband CQI value for each code word, and the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, and transmission is to carry out on subband set S;
UE reports selected single pre-coding matrix W1 designator index PMI value;
UE reports selected single matrix W 2 designator index PMI values.
RI＞2 o'clock, UE carries out:
For each subband, first-selected pre-coding matrix W1 chooses in codebook subset C1, determines the index PMI1 of described W1 in code book C1, and transmission is only carried out in this sets of subbands;
Determine that W2 is the particular matrix of an acquiescence, determine the index PMI2 of described W2 in code book C2, and transmission is based on W1 and the common W that generates of W2 carries out;
UE reports a subband CQI value for each code word on each sets of subbands S, the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, perhaps, the particular matrix W2 that subband CQI value also can be based on selected single pairing matrix of pre-coding matrix W1 index PMI1 and acquiescence calculates, and transmission is to carry out on corresponding subband;
UE reports a broadband CQI value for each code word, the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, perhaps, the particular matrix W2 that broadband CQI value also can be based on selected single pairing matrix of pre-coding matrix W1 index PMI1 and acquiescence calculates, and transmission is to carry out on subband set S;
UE reports selected single pre-coding matrix W1 designator index PMI value.
Application example four
At the PUSCH channel, in same sub transmit selected precoding designator PMI1 and matrix designator PMI2 when feeding back aperiodic, and the CQI feedback system is the subband feedback that UE selects.PMI that reports and CQI value are that condition is calculated with the RI that reports.UE carries out:
RI＜=2 o'clock, UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, and transmission is to carry out on sets of subbands S;
UE reports a broadband CQI value for each code word, and the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, and transmission is to carry out on sets of subbands S;
UE reports the index PMI value of selected single pre-coding matrix W1 for all sets of subbands S;
UE should carry out the selection of uniting to M first-selected subband and first-selected single matrix W 2, and M first-selected subband selected from subband set S, and width is k; Single matrix W 2 is selected from code book C2, determines the index PMI2 of described W2 in code book C2; Pre-coding matrix W is generated jointly by selected W1 and W2; W is used for transmission on the selected M subband as precoding;
UE reports a CQI value for each code word, and it is reflected at selected M the transmission on the preferred subband, and uses the identical single pre-coding matrix W1 that has selected on M subband.
UE reports the index PMI value of the single matrix W 2 that is used to M selected subband.
RI＜=2 o'clock, UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, and supposes to be transmitted on the sets of subbands S and carry out;
Determine that W2 is the particular matrix of an acquiescence, determine the index PMI2 of described W2 in code book C2, and transmission is based on W1 and the common W that generates of W2 carries out;
UE reports a broadband CQI value for each code word, the CQI value is calculated based on the selected pairing matrix of single pre-coding matrix W1 index PMI1 that uses on all subbands, perhaps, the particular matrix W2 that the CQI value also can be based on selected single pairing matrix of pre-coding matrix W1 index PMI1 and acquiescence calculates, and supposes to be transmitted on the sets of subbands S and carry out;
UE reports the index PMI value of selected single pre-coding matrix W1 for all sets of subbands S;
UE should carry out the selection of uniting to M first-selected subband and first-selected single matrix W 1, and M first-selected subband selected from subband set S, and width is k; Single matrix W 1 is selected from code book C1; W1 is used for transmission on the selected M subband as precoding;
UE only is reflected at selected M the transmission on the preferred subband for each code word reports a CQI value, and uses the identical single pre-coding matrix W1 that has selected on M subband;
UE reports the index PMI value of the single matrix W 1 that is used to M selected subband.
Application example five
At the PUCCH channel, during periodic feedback, transmit selected precoding designator PMI1 in subframe, the CQI feedback system is the broadband feedback.In the R10 transmission mode, PMI that UE reports and CQI are to be that condition is calculated with the RI that one-period reports on it.UE carries out:
On the subframe that RI reports (only for transmission mode 8 and R10 transmission mode), UE carries out:
UE determines a RI value, supposes to transmit and carries out on sets of subbands S;
UE reports a report that comprises the type 3 of a RI.
In the subframe that CQI/PMI reports, UE carries out:
From code book C1, select a single pre-coding matrix W1, determine the index PMI1 of described W1 in code book C1, suppose to transmit and on sets of subbands S, carry out;
UE comprises in each report that reports a type 2 opportunity that reports continuously:
1, single broadband CQI value, and CQI value is calculated and is based on the pairing matrix of single pre-coding matrix W1 index PMI1 that all uses on all subbands, and the hypothesis transmission is carried out on sets of subbands S;
2, the index value PMI of a single pre-coding matrix W1 who has selected also is broadband P MI;
3, when RI＞1, space, the broadband differential CQI of a 3-bit.
Application example six
At the PUCCH channel, during periodic feedback, selected precoding designator PMI1 of transmission and matrix designator PMI2 in subframe, the CQI feedback system is the subband feedback that UE selects.
In the subframe that RI reports (only in the transmission mode of transmission mode 8 and R10), UE carries out:
UE determines a RI value, supposes what transmission was carried out on the tangible sets of subbands S;
UE reports a report that comprises the type 3 of a RI.
On the subframe that broadband CQI/PMI reports, UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, supposes to transmit and carries out on sets of subbands S;
Self-contained continuously report opportunity at each, UE reports the report of a type 2, comprising:
1, single broadband CQI value, and CQI value is calculated and is based on the pairing matrix of single pre-coding matrix W1 index PMI1 that all uses on all subbands, and the hypothesis transmission is carried out on sets of subbands S;
2, selected pre-coding matrix W1 designator PMI value also is broadband P MI;
3, when RI＞1, extra space, 3-bit broadband differential CQI value.
Wherein, under the R10 transmission mode, PMI and CQI value all are that the RI of an above reporting period calculates.
In the subframe of selecting subband CQI to report, UE carries out:
UE should select first-selected subband in the subband set that includes the Nj subband in every J bandwidth divided, and wherein J is provided by table 7.
UE should self-contained continuously report divide for each bandwidth opportunity to send a Class1 and report, wherein comprise at each:
The CQI value of code word 0 is only reacted the transmission on the subband of selecting in the bandwidth division of previous step decision, together with the first-selected subband CQI L-bit sign of correspondence.
When RI＞1, represent its deviant with respect to code word 1 with extra 3-bit subband space differential CQI value.
Wherein, the subband CQI sequence number of the subband CQI sequence number-code word 1 of code word 1 deviant=code word 0.Suppose in all subbands, to use the single pre-coding matrix that reports recently, and be transmitted on the subband set S.
The corresponding relation of 3-bit subband space differential CQI value and offset level sees Table 6.
For the transmission of R10, the calculating that subband is chosen with the CQI value is condition with cycle broadband P MI and the RI that reports at last.
Application example seven
At the PUCCH channel, during periodic feedback, selected precoding designator PMI1 of transmission and matrix designator PMI2 in different subframes, the CQI feedback system is the subband feedback that UE selects.
In the subframe that RI reports (only in the transmission mode of transmission mode 8 and R10), UE carries out:
UE determines a RI value, supposes what transmission was carried out on the tangible sets of subbands S;
UE reports a report that comprises the type 3 of a RI.
On the subframe that broadband CQI/PMI reports, UE carries out:
UE selects a single pre-coding matrix W1 from code book C1, determine the index PMI1 of described W1 in code book C1, supposes to transmit and carries out on sets of subbands S;
Self-contained continuously report opportunity at each, UE reports the report of a type 2, comprising:
1, single broadband CQI value that is used for code word 0, and CQI value is calculated and is based on the pairing matrix of single pre-coding matrix W1 index PMI1 that all uses on all subbands, and the hypothesis transmission is carried out on sets of subbands S;
2, selected pre-coding matrix W1 designator PMI value also is broadband P MI;
3, when RI＞1, be used for extra space, the 3-bit broadband differential CQI value of code word 1.
Wherein, under the R10 transmission mode, PMI and CQI value all are that the RI of an above reporting period calculates.
In the subframe of selecting subband CQI to report, UE carries out:
UE should select first-selected subband in the subband set that includes the Nj subband in every J bandwidth divided, and wherein J is provided by table 7;
UE selects a single matrix W 2 from code book C2, determine the index PMI2 of described W2 in code book C2, and suppose transmission based on by the common pre-coding matrix W that generates of W1 and W2, and transmission is only carried out on the selected subband in the broadband part by the previous step decision;
UE should self-contained continuously report divide for each bandwidth opportunity to send a type 5 and report, wherein comprise at each:
The CQI value of code word 0 is only reacted the transmission on the subband of selecting in the bandwidth division of previous step decision, together with the first-selected subband CQI L-bit sign of correspondence.
Selected single matrix W 2 designator PMI values (also being subband PMI).
When RI＞1, represent its deviant with respect to code word 1 with extra 3-bit subband space differential CQI value.Wherein, the subband CQI sequence number of the subband CQI sequence number-code word 1 of code word 1 deviant=code word 0.Suppose that pre-coding matrix W is generated jointly by single pre-coding matrix W1 that reports recently and selected single matrix W 2, and carry out on the transmission subband selected in broadband part by the previous step decision.The corresponding relation of 3-bit subband space differential CQI value and offset level sees Table 6.
Wherein, for the R10 transmission mode, subband is selected and the CQI value all is that index PMI value and RI with the single pre-coding matrix W1 of last report cycle calculates.
Table 6: the corresponding relation of subband space differential CQI value and offset level
Table 7: subband size (k) and bandwidth are divided (J) vs. downlink system bandwidth
In order to realize a kind of feedback method of channel status information of the present invention, the embodiment of the invention also provides a kind of terminal, is used for according to indication information to the base station feedback channel condition information, and as shown in Figure 3, this terminal comprises determination module and feedback module, wherein:
Described determination module, in order to determine first kind pre-coding matrix index according to indication information, the perhaps first kind pre-coding matrix index and the second matroid index; And according to described definite first kind pre-coding matrix index calculating channel quality information (CQI);
Described feedback module is sent to the base station in order to the CQI that described determination module is calculated, the perhaps CQI that described determination module is calculated, and first kind pre-coding matrix index and/or the described second matroid index determined are sent to the base station;
Wherein, first kind pre-coding matrix index is used for indicating the index of first kind pre-coding matrix in the first kind precoding codebook set of configuration, and the second matroid index is used for indicating the index of second matroid in the second class code book set of configuration; Described first kind pre-coding matrix is used to shine upon the channel information of broadband and/or long-term channel, and described second matroid is used to shine upon the channel information of subband and/or short-term channel.
Further, described determination module, according to described indication information, determine the feedback model of described UE earlier, then according to the definite channel condition information of described definite feedback model to base station feedback, described channel condition information comprises CQI, perhaps CQI and definite first kind pre-coding matrix index and/or described second matroid index.
Further, described indication information is the high-rise configuration signal information that the base station sends.
Further, described CQI comprises broadband CQI and/or subband CQI.
Further, described determination module is in order to determine order indicator information (RI) according to described indication information; Described feedback module also is sent to the base station in order to the RI that described determination module is determined.
Further, described determination module also needs to determine first kind pre-coding matrix index according to the value of up-to-date order designator, the perhaps first kind pre-coding matrix index and the second matroid index, and calculate CQI.
Further, described determination module calculates CQI according to the matrix of up-to-date order designator and first kind pre-coding matrix index correspondence; Perhaps according to the matrix of up-to-date order designator, first kind pre-coding matrix index correspondence, and second matroid of an appointment calculates CQI.
Further, described determination module, comprise according to described definite first kind pre-coding matrix index calculating channel quality information: described determination module, according to the matrix computations CQI of described definite first kind pre-coding matrix index correspondence, perhaps calculate CQI according to the matrix of described definite first kind pre-coding matrix index correspondence and second matroid of an appointment.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (16)
1. feedback method of channel status information, user terminal (UE), comprising to the base station feedback channel condition information according to indication information:
UE determines first kind pre-coding matrix index according to described indication information, the perhaps first kind pre-coding matrix index and the second matroid index, wherein first kind pre-coding matrix index is used for indicating the index of first kind pre-coding matrix in the first kind precoding codebook set of configuration, and the second matroid index is used for indicating the index of second matroid in the second class code book set of configuration;
UE is according to described definite first kind pre-coding matrix index calculating channel quality information (CQI);
UE is sent to the base station with the CQI that calculates, and perhaps with the CQI that calculates, and first kind pre-coding matrix index and/or the described second matroid index determined are sent to the base station;
Wherein, described first kind pre-coding matrix is used to shine upon the channel information of broadband and/or long-term channel, and described second matroid is used to shine upon the channel information of subband and/or short-term channel.
2. feedback method as claimed in claim 1 is characterized in that, also comprises:
Described UE is according to described indication information, determine the feedback model of described UE earlier, then according to the definite channel condition information of described definite feedback model to base station feedback, described channel condition information comprises CQI, perhaps CQI and definite first kind pre-coding matrix index and/or described second matroid index.
3. feedback method as claimed in claim 1 or 2 is characterized in that:
Described indication information is the high-rise configuration signal information that the base station sends.
4. feedback method as claimed in claim 1 is characterized in that:
Described CQI comprises broadband CQI and/or subband CQI.
5. feedback method as claimed in claim 1 or 2 is characterized in that:
Described UE also comprises order indicator information (RI) according to described indication information in the channel condition information of base station feedback.
6. feedback method as claimed in claim 5 is characterized in that:
Terminal also needs to determine first kind pre-coding matrix index according to the value of up-to-date RI, the perhaps first kind pre-coding matrix index and the second matroid index, and calculate CQI.
7. feedback method as claimed in claim 6 is characterized in that:
Terminal also needs to calculate CQI according to the matrix of up-to-date RI and first kind pre-coding matrix index correspondence; Perhaps
Terminal also needs the matrix according to up-to-date RI, first kind pre-coding matrix index correspondence, and second matroid of an appointment calculates CQI.
8. feedback method as claimed in claim 1 or 2 is characterized in that:
UE comprises according to described definite first kind pre-coding matrix index calculating channel quality information:
UE is according to the matrix computations CQI of described definite first kind pre-coding matrix index correspondence, perhaps
UE calculates CQI according to the matrix of described definite first kind pre-coding matrix index correspondence and second matroid of an appointment.
9. terminal is used for according to indication information to the base station feedback channel condition information, and this terminal comprises determination module and feedback module, wherein:
Described determination module, in order to determine first kind pre-coding matrix index according to indication information, the perhaps first kind pre-coding matrix index and the second matroid index; And according to described definite first kind pre-coding matrix index calculating channel quality information (CQI);
Described feedback module is sent to the base station in order to the CQI that described determination module is calculated, the perhaps CQI that described determination module is calculated, and first kind pre-coding matrix index and/or the described second matroid index determined are sent to the base station;
Wherein, first kind pre-coding matrix index is used for indicating the index of first kind pre-coding matrix in the first kind precoding codebook set of configuration, and the second matroid index is used for indicating the index of second matroid in the second class code book set of configuration; Described first kind pre-coding matrix is used to shine upon the channel information of broadband and/or long-term channel, and described second matroid is used to shine upon the channel information of subband and/or short-term channel.
10. terminal as claimed in claim 9 is characterized in that:
Described determination module, according to described indication information, determine the feedback model of described UE earlier, then according to the definite channel condition information of described definite feedback model to base station feedback, described channel condition information comprises CQI, perhaps CQI and definite first kind pre-coding matrix index and/or described second matroid index.
11., it is characterized in that as claim 9 or 10 described terminals:
Described indication information is the high-rise configuration signal information that the base station sends.
12. terminal as claimed in claim 9 is characterized in that:
Described CQI comprises broadband CQI and/or subband CQI.
13., it is characterized in that as claim 9 or 10 described terminals:
Described determination module is in order to determine order indicator information (RI) according to described indication information;
Described feedback module also is sent to the base station in order to the RI that described determination module is determined.
14. terminal as claimed in claim 13 is characterized in that:
Described determination module also needs to determine first kind pre-coding matrix index according to the value of up-to-date order designator, the perhaps first kind pre-coding matrix index and the second matroid index, and calculate CQI.
15. terminal as claimed in claim 14 is characterized in that:
Described determination module calculates CQI according to the matrix of up-to-date order designator and first kind pre-coding matrix index correspondence; Perhaps according to the matrix of up-to-date order designator, first kind pre-coding matrix index correspondence, and second matroid of an appointment calculates CQI.
16., it is characterized in that as claim 9 or 10 described terminals:
Described determination module comprises according to described definite first kind pre-coding matrix index calculating channel quality information:
Described determination module according to the matrix computations CQI of described definite first kind pre-coding matrix index correspondence, perhaps calculates CQI according to the matrix of described definite first kind pre-coding matrix index correspondence and second matroid of an appointment.
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