CN102263613A - Method and device for feeding back channel state information - Google Patents
Method and device for feeding back channel state information Download PDFInfo
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- CN102263613A CN102263613A CN2011102255336A CN201110225533A CN102263613A CN 102263613 A CN102263613 A CN 102263613A CN 2011102255336 A CN2011102255336 A CN 2011102255336A CN 201110225533 A CN201110225533 A CN 201110225533A CN 102263613 A CN102263613 A CN 102263613A
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Abstract
The invention discloses a method and device for feeding back channel state information. The method and device can both be used for obtaining the channel state information and feeding back the channel state information on a PUSCH (physical uplink shared channel) according to a preset feedback method. In the channel state information feedback technology disclosed by the invention, the channel state information can be determined according to the channel information, a corresponding feedback mode is selected according to the reporting method, and the channel state information is fed back by using the feedback mode. The channel state information feedback technology solves the problem of the prior art that the system performance is poorer caused by high cost of the channel information feedback method, thus the feedback precision and the performance of a communication system are improved.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of channel state information feedback method and device.
Background technology
In the wireless communication system, transmitting terminal and receiving terminal take the mode of spatial reuse to use many antennas to obtain higher speed.With respect to general method for spacial multiplex, a kind of technique for enhancing is that receiving terminal feeds back to the transmitting terminal channel information, and transmitting terminal uses the emission precoding technique according to the channel information that obtains, and can greatly improve transmission performance.For single user's multiple-input and multiple-output (SU-MIMO, Single User Multi-input Multi-output), directly use the channel characteristics Vector Message to carry out precoding; For multiuser MIMO (MU-MIMO), needing more accurately, channel information instructs multi-user pre-coding.
(Long Term Evolution, LTE) in the works, the feedback of channel information mainly is to utilize the feedback method of better simply single code book, and the performance of the emission precoding technique of MIMO depends on the accuracy of code book feedback at the 3GPP Long Term Evolution.
In the standard of LTE, the minimum feedback unit of channel information is subband (Subband), and a subband is made up of several Resource Block (RB, Resource Block), and each RB is made up of a plurality of Resource Units (RE, Resource Element); RE is the least unit of running time-frequency resource among the LTE.The object of correspondence can be subband (Subband) during subscriber equipment (UE) feedback channel information, or a plurality of subband, and broadband (Wideband).
Have a lot of transmission modes and feedback model among the LTE, several main transmission modes are as follows:
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=1precoding);
Mode 7: single current beamforming: port 5 (Single-antenna port:port 5).
Different feedback models and feedback content are arranged under the different transmission modes.During spatial reuse, the feedback content of uplink channel information mainly contains three kinds:
Precoding matrix indicators information (PMI), the characteristic feature Vector Message is recommended the base station, is used for the downlink precoding technology.
PMI is the index of an indication code word, and the code word of indication is used for the characteristic feature Vector Message.In four antenna systems, PMI information comprises single PMI; In eight antenna systems, PMI information comprises i1 and i2.
Order indicator information (RI), the order of sign channel is recommended the number of plies of base station as descending support.
Channel quality indication (CQI) information (CQI) characterizes quality of channel information, characterizes channel quality with the modulation coding mode of recommending, and the modulation coding mode of high-order represents that performance is good more more.
More than these important channel informations (PMI/RI/CQI) be divided into following two kinds in up feedback kind:
Periodic feedback mainly is carried on the feedback on the Physical Uplink Control Channel (PUCCH).
Aperiodic, feedback was carried on the feedback on the Physical Uplink Shared Channel (PUSCH).
Periodic feedback is to dispose, and aperiodic, feedback was the feedback of irregular flip-over type; Feedback aperiodic on PUSCH is the higher feedback of a kind of precision, belongs to auxiliary feedback, is used to improve the feedback of precision.
Aperiodic, the feedback model of feedback was as shown in table 1:
Table 1
Among the Mode x-y in the table 1, x represents the feedback of CQI, and 1 is the feedback of Wideband CQI, and 2 are Subband CQI feedback, and 3 is the CQI feedback of high-rise configuration.
Y represents the PMI feedback, and 0 is no PMI, and 1 is single PMI, and 2 is a plurality of PMI.
Closed-Loop Spatial Multiplexing is always supported the feedback of PMI, so the feedback model on the PUSCH of its support is: Modes 1-2,2-2,3-1.
Modes1-2:, all feed back 1 PMI and feed back CQI at whole bandwidth at each Subband.
Modes2-2: feed back a broadband CQI (wideband CQI) and broadband P MI, feedback M individual better positional information, the associating CQI of a M subband and the associating PMI of M subband of subband;
Modes3-1: in a bandwidth range S subband of high level configuration, feedback associating CQI, associating PMI, and feed back the independent CQI of each subband.
In the feedback of reality, RI also with the subframe internal feedback of above-mentioned CQI information and PMI information at same PUSCH.RI is restricted to a numerical value in 1 to N the scope, and N=min (Nt, Nr); Wherein, Nt represents number of transmit antennas, and Nr represents the reception antenna number.
The feedback of CQI mainly is divided into subband CQI (subband CQI) and broadband CQI, just the associating CQI of a plurality of subbands on implication.The CQI grade that can support when the CQI grade that can support when its implication is subband transmission of the descending use of hypothesis respectively and a plurality of subbands of the descending use of hypothesis transmit jointly.
CQI at same resource units can be 1 or 2 in addition.Main relevant with RI, during RI=1 1 CQI; RI＞1 o'clock is 2 CQI.Be 4bit during 1 CQI; When feeding back 2 CQI, the 2nd CQI uses differential technique, based on the 1st CQI difference, is 3bit.As seen, the maximum cost of described feedback method is 11bit, and this also is the maximum supported expense that PUCCH goes up CSI information when feeding back.
CQI is for weighing an index of down channel quality quality.CQI represents with 0 to 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.
Specifically, the CQI definition that occurs among the LTE is various, according to different principles, can carry out following division to CQI:
Be divided into broadband CQI and subband CQI according to measuring bandwidth;
Wideband CQI refers to the indication of the channel status of all subband, and what obtain is CQI information on the subband S set, also is broadband CQI information;
Subband CQI refers 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.
Subband CQI can be divided into full subband CQI feedback (all subband CQI) and optimum M subband CQI feedback (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 port0, the Closed-Loop Spatial Multiplexing of port5, 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 (Differential CQI) according to the CQI method for expressing
Absolute value CQI is exactly the CQI index of representing with 4bit (CQI index);
Differential CQI (Differential CQI) is the CQI index that represents with 2bit or 3bit; Differential CQI be divided into again the 2nd code stream with respect to the differential CQI of the 1st code stream, subband CQI with respect to the differential CQI of subbandCQI and suband CQI differential CQI with respect to broadband CQI.
Report mode to be divided into wideband CQI, UE selected (subband CQI), High layer configured (subband CQI) according to 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.
In the LTE-A system, the channel condition information feedback can be finished by following steps:
Step 1: the base station is used for UE and estimates down channel to the UE pilot signal transmitted.
Step 2:UE estimates down channel according to pilot signal.
Step 3:UE determines channel condition information, comprises RI, PMI and CQI.
Step 4:UE according to feedback model to the base station feedback channel condition information.
(Long Term Evolution Advanced, LTE-A) system supports bigger system bandwidth (reaching as high as 100MHz) as the evolution standard of LTE to senior Long Term Evolution, and the existing standard of backward compatibility LTE.In order to obtain the covering and the throughput of higher sub-district averaging spectrum efficient and raising cell edge, LTE-A is on the basis of prior LTE system, descendingly maximum 8 antennas have been supported, and proposing some feedback enhancement techniques aspect the code book feedback, mainly is to strengthen the feedback accuracy of code book and utilize the temporal correlation of channel information and/or frequency domain correlation to draw in one's expenditure.Above-mentioned technology can improve evolution international mobile communication (International Mobile Telecommunications-Advance, IMT-Advance) availability of frequency spectrum of system, to alleviate frequency spectrum resource in short supply.Simultaneously, the design of code book and enhancing also need to take into full account the feature of dual polarization channel.New code book enhancement techniques core is to utilize pre-coding matrix of the common expression of two index of i1 and i2.
At present, multi-antenna technology has been widely used in the LTE-A system, and many antenna calibrations of thing followed problem has also caused widely to be paid close attention to.The antenna calibration problem is meant: in multiaerial system, exist the regular hour to postpone and phase error between each antenna, the variation of the channel condition that these errors are brought will influence the selection of CQI and PMI, thereby influences the performance of the whole communication decorum.And when the CQI of feedback and PMI precision when not enough, the performance loss that will make the antenna calibration problem bring is more obvious.
When the Closed-Loop Spatial Multiplexing system supported feedback model 2-2, feedback content comprised broadband CQI, broadband P MI, and the associating PMI of the associating CQI of M subband and M subband, and broadband RI.Because RI is most important to the selection of PMI and CQI, therefore, the feedback accuracy of RI is very big to the systematic function influence.Because antenna calibration and feedback delay and scheduling delay problem, the channel condition when channel condition when making the transmission data and feedback is not inconsistent, and when the RI feedback accuracy is not enough, can have a strong impact on the accuracy of RI again.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of channel state information feedback method and device, to improve feedback accuracy, elevator system performance.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of channel state information feedback method, this method comprises:
Terminal is obtained channel condition information, and capable physically shared channel PUSCH upward feeds back described channel condition information according to the feedback on reservation pattern;
Wherein, described channel condition information comprise following one of at least: channel quality indication (CQI) information CQI, precoding matrix indicators information PMI, order indicator information RI; Described RI comprises M the associating RI on the subband;
In four antenna systems, described PMI information is single PMI; In eight antenna systems, described PMI information comprises precoding matrix indicators information i1 and i2.
The channel condition information that terminal is fed back comprises:
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
A described M subband is discontinuous subband.
The channel condition information that terminal is fed back comprises:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
A described M subband is continuous subband.
Described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the precoding designator i1 on broadband CQI, broadband P MI, the described broadband width, the described broadband width.
Described broadband CQI comprises one of following and combination: broadband CQI, broadband differential CQI; This differential CQI is the differential CQI between the different streams of code words;
Differential CQI between the described streams of code words is: when two streams of code words, the broadband CQI of second streams of code words is based on the differential CQI of first streams of code words broadband CQI.
The CQI of each subband comprises one of following and combination on the described M subband: the differential CQI of each subband on absolute CQI, the M subband of each subband on M subband; This differential CQI is one of following: based on the differential CQI of broadband CQI; Differential CQI based on one of them subband CQI; Differential CQI based on the associating CQI of M subband; Differential CQI between the different streams of code words;
Differential CQI between the described streams of code words is: when two streams of code words, the subband CQI of second streams of code words is based on the differential CQI of the corresponding subband CQI of first streams of code words.
Associating CQI on the described M subband comprises one of following and combination: the associating differential CQI on associating CQI, the M subband on M subband; This differential CQI is one of following: based on the differential CQI of broadband CQI; Differential CQI between the different streams of code words;
Differential CQI between the described streams of code words is: when two streams of code words, the associating CQI of the M of second a streams of code words subband is based on the differential CQI of associating CQI of M subband of first streams of code words.
A kind of channel condition information feedback device, this device comprises:
Acquisition module is used for terminal and obtains channel condition information;
Feedback module is used for terminal and feeds back described channel condition information according to the feedback on reservation pattern on PUSCH.
Described feedback module is used for feeding back following channel condition information according to one of following feedback system on PUSCH:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Wherein, M is less than the subband number that system bandwidth comprised,
The applied M of a described feedback module subband is discontinuous subband;
Wherein, described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the precoding designator i1 on broadband CQI, broadband P MI, the described broadband width, the described broadband width;
Perhaps, described feedback module is used for feeding back following channel condition information according to one of following feedback model on PUSCH:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised;
The applied M of a described feedback module subband is continuous subband;
Described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the precoding designator i1 on broadband CQI, broadband P MI, the described broadband width, the described broadband width.
A kind of terminal, this terminal comprise information determination module and feedback information module; Wherein,
Described information determination module is used for determining channel condition information, and determines feedback method according to indication information;
Described feedback information module is used for according to described feedback method, by PUSCH the determined channel condition information of information determination module is sent to the base station.
Described information determination module is used for determining associating RI on broadband RI and M the subband according to indication information; And determine CQI and PMI according to the associating RI on up-to-date broadband RI and M the subband.
Described feedback module is used for the associating RI on described broadband RI and M the subband, and CQI and PMI information are sent to the base station.
Described indication information is the high-rise configuration signal information that the base station sends;
Described CQI comprises one of following and combination: the CQI of each subband in the associating CQI of broadband CQI, a M subband and M the subband;
In four antenna systems, described PMI comprises one of following and combination: the PMI of each subband on associating PMI, the M subband of broadband P MI, a M subband;
In eight antenna systems, described PMI comprises one of following and combination: the i2 of each subband on associating i2, the M subband of broadband i1, broadband i2, a M subband.
Channel condition information feedback technique of the present invention, can determine channel condition information according to channel information, select corresponding feedback model according to reporting mode, and use this feedback model feeding back channel state information, solve the poor problem of the bigger systematic function that causes of channel information feedback method expense in the prior art, thereby improved the performance of feedback accuracy and communication system.
Description of drawings
Fig. 1 is the channel condition information process of feedback figure of the embodiment of the invention;
Fig. 2 is the channel condition information process of feedback figure of the preferred embodiment of the present invention one;
Fig. 3 is the channel condition information feedback device figure of the embodiment of the invention one.
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.
Referring to Fig. 1, Fig. 1 is the channel condition information process of feedback figure of the embodiment of the invention, and flow process shown in Figure 1 may further comprise the steps:
S102: terminal is obtained channel condition information, comprising: CQI, PMI and RI; Wherein, in eight antenna systems, PMI information comprises precoding designator i1 and i2; In four antenna systems, PMI information comprises single PMI.
S104: terminal on PUSCH according to feedback on reservation pattern feeding back channel state information.
Pass through above-mentioned steps, terminal is obtained channel condition information, according to feedback on reservation pattern feeding back channel state information, has overcome the inaccurate problem of feedback of channel information pattern feedback information in the prior art on PUSCH, improve feedback accuracy, thereby improved the performance of communication system.
Preferably, among the S104, the channel condition information that terminal is fed back comprises:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.Preferably, M subband can be discontinuous subband in the above-mentioned feedback method, also can be continuous subband.
Preferably, broadband CQI can comprise differential CQI, and wherein differential CQI is one of following: be the differential CQI between the streams of code words; Preferably, when two streams of code words, the broadband CQI of second streams of code words can be based on the differential CQI of first streams of code words broadband CQI.
Preferably, the CQI of each subband can be differential CQI on M subband, and wherein, differential CQI is one of following: based on the differential CQI of broadband CQI; Differential CQI based on one of them subband CQI; Differential CQI based on the associating CQI of M subband; Differential CQI between the different streams of code words; Especially, when two streams of code words, the subband CQI of second streams of code words can be based on the differential CQI of the corresponding subband CQI of first streams of code words.
Preferably, the associating CQI on M subband can be differential CQI, and wherein, differential CQI is one of following: based on the differential CQI of broadband CQI; Differential CQI between the different streams of code words; When two streams of code words, the associating CQI of the M of second a streams of code words subband can be based on the differential CQI of associating CQI of M subband of first streams of code words.
By above preferred embodiment, adopt differential mode transmission CQI, reduce expense, and improved precision.
Embodiment one
Referring to flow process shown in Figure 2, this flow process comprises the steps:
S201, the base station is used for UE test down channel state to the terminal pilot signal transmitted;
S203, described terminal is estimated the down channel state according to the pilot signal that receives, and obtains channel condition information; Described channel condition information comprises: CQI information, PMI information and RI information;
Wherein, in eight antenna systems, described PMI information comprises precoding designator i1 and i2; In four antenna systems, described PMI information comprises single PMI;
S205, described terminal on PUSCH according to feedback on reservation pattern feeding back channel state information.
Wherein, the described channel condition information that feeds back on described PUSCH of described terminal comprises:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
Wherein, the associating CQI on M subband is the associating differential CQI on associating CQI, the M subband on following one and combination thereof: the M subband;
Wherein, the CQI of each subband is the differential CQI of each subband on CQI, the M subband of each subband on following one and combination thereof: the M subband on M subband;
Wherein, described broad-band channel information can comprise: broadband RI, broadband CQI and broadband P MI; Perhaps, described broad-band channel information can comprise: broadband RI, broadband CQI, broadband i1 and broadband i2;
Wherein, M subband can be continuous subband, also can be discontinuous subband;
Wherein, broadband CQI is following one and combination thereof: broadband CQI, broadband differential CQI; In actual applications, as shown in Figure 3, can design a kind of feedback terminal, comprise based on above-mentioned technical description:
Acquisition module 32 is used to obtain channel condition information, comprising: CQI information, PMI information and RI information;
In eight antenna systems, described PMI comprises precoding designator i1 and i2; In four antenna systems, described PMI comprises single PMI;
Feedback module 34 is used on PUSCH according to feedback on reservation pattern feeding back channel state information, and the described channel condition information of feedback comprises:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
Wherein M subband can be continuous subband, also can be discontinuous subband;
Wherein, described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the PMI on broadband CQI, broadband differential CQI, the described broadband width, the precoding designator i1 on the described broadband width, the described broadband width;
Present embodiment has adapted to the application of antenna calibration and code book enhancement techniques by being increased in the feedback model that PUSCH goes up the channel condition information of feedback, has improved feedback accuracy, thereby has improved systematic function significantly.
Embodiment two
When eight antenna transmission, channel condition information comprises CQI, PMI and RI.Wherein, because the application of eight antenna enhancement techniques, PMI information has comprised precoding designator i1 and i2.Concrete, on PUSCH, carry out feedback aperiodic, and the M that from sets of subbands S, a selects subband, the process that UE carries out the channel condition information feedback comprises the steps:
Step 1: terminal is determined channel condition information according to pilot signal, comprises CQI, RI and precoding designator i1 and i2.
Step 2: terminal on PUSCH to the base station reporting status information of channel.
Preferably, in the step 2, UE according to one of following feedback model on PUSCH to the base station feedback channel condition information:
Mode one: UE reports the associating CQI of M subband; The i1 that UE reports the S subband set to close, report simultaneously S on the subband i2 and the associating i2 on M subband; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the associating CQI information on the M of other streams of code words subband can be the differential CQI with respect to the associating CQI information on M the subband of first streams of code words; Perhaps, the associating CQI information on M the subband of all streams of code words or part streams of code words is the differential CQI with respect to broadband CQI information.When the streams of code words number was 1, the CQI information of M subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Mode two: UE reports the CQI of each subband on M the subband; The i1 that UE reports the S subband set to close, report simultaneously S on the subband i2 and the associating i2 on M subband; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the CQI information of each subband can be the differential CQI with respect to the CQI information of each subband on M the subband of first streams of code words on the M of other streams of code words subband; Perhaps, the CQI information of each subband is differential CQI with respect to broadband CQI information on M the subband of all streams of code words or part streams of code words.When the streams of code words number was 1, the CQI information of M each subband of subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Mode three: UE reports the associating CQI of M subband; The i1 that UE reports the S subband set to close, report simultaneously S on the subband i2 and M subband on the i2 of each subband; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the associating CQI information on the M of other streams of code words subband can be the differential CQI with respect to the associating CQI information on M the subband of first streams of code words; Perhaps, the associating CQI information on M the subband of all streams of code words or part streams of code words is the differential CQI with respect to broadband CQI information.When the streams of code words number was 1, the CQI information of M subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Mode four: UE reports the CQI of each subband on M the subband; The i1 that UE reports the S subband set to close, report simultaneously S on the subband i2 and M subband on the i2 of each subband; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the CQI information of each subband can be the differential CQI with respect to the CQI information of each subband on M the subband of first streams of code words on the M of other streams of code words subband; Perhaps, the CQI information of each subband is differential CQI with respect to broadband CQI information on M the subband of all streams of code words or part streams of code words.When the streams of code words number was 1, the CQI information of M each subband of subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Wherein, selected M subband on S subband can be continuous subband, also can be discontinuous subband.
Embodiment three
When four antenna transmission, channel condition information comprises CQI, PMI and RI.Concrete, on PUSCH, carry out feedback aperiodic, and the M that a selects subband is when being discontinuous subband from sets of subbands S, UE carries out the process that channel condition information feeds back and comprises the steps:
When four antenna transmission, channel condition information comprises CQI, PMI and RI.Concrete, on PUSCH, carry out feedback aperiodic, and the M that from sets of subbands S, a selects subband, the process that UE carries out the channel condition information feedback comprises the steps:
Step 1: terminal is determined channel condition information according to pilot signal, comprises CQI, RI and precoding designator PMI information.
Step 2: terminal on PUSCH to the base station reporting status information of channel.
Preferably, in the step 2, UE according to one of following feedback model on PUSCH to the base station feedback channel condition information:
Mode one: UE reports the associating CQI of M subband; The PMI that UE reports the S subband set to close reports M the associating PMI on the subband simultaneously; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the associating CQI information on the M of other streams of code words subband can be the differential CQI with respect to the associating CQI information on M the subband of first streams of code words; Perhaps, the associating CQI information on M the subband of all streams of code words or part streams of code words is the differential CQI with respect to broadband CQI information.When the streams of code words number was 1, the CQI information of M subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Mode two: UE reports the CQI of each subband on M the subband; The PMI that UE reports the S subband set to close reports M the associating PMI on the subband simultaneously; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the CQI information of each subband can be the differential CQI with respect to the CQI information of each subband on M the subband of first streams of code words on the M of other streams of code words subband; Perhaps, the CQI information of each subband is differential CQI with respect to broadband CQI information on M the subband of all streams of code words or part streams of code words.When the streams of code words number was 1, the CQI information of M each subband of subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Mode three: UE reports the associating CQI of M subband; The PMI that UE reports the S subband set to close reports the PMI of each subband on M the subband simultaneously; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the associating CQI information on the M of other streams of code words subband can be the differential CQI with respect to the associating CQI information on M the subband of first streams of code words; Perhaps, the associating CQI information on M the subband of all streams of code words or part streams of code words is the differential CQI with respect to broadband CQI information.When the streams of code words number was 1, the CQI information of M subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Mode four: UE reports the CQI of each subband on M the subband; The PMI that UE reports the S subband set to close reports the PMI of each subband on M the subband simultaneously; UE reports broadband CQI for each streams of code words; UE reports broadband RI; UE reports M the associating RI on the subband;
Wherein, when the streams of code words number greater than 1 the time, the broadband CQI information of other streams of code words can be the differential CQI with respect to first streams of code words CQI information;
Wherein, when the streams of code words number greater than 1 the time, the CQI information of each subband can be the differential CQI with respect to the CQI information of each subband on M the subband of first streams of code words on the M of other streams of code words subband; Perhaps, the CQI information of each subband is differential CQI with respect to broadband CQI information on M the subband of all streams of code words or part streams of code words.When the streams of code words number was 1, the CQI information of M each subband of subband can also can be the differential CQI with respect to broadband CQI information for absolute CQI value;
Wherein, selected M subband on S subband can be continuous subband, also can be discontinuous subband.
Device for carrying out said
This device comprises: acquisition module 32, feedback module 34; Wherein,
Acquisition module 32 is used to obtain channel condition information, comprising: CQI, PMI and RI;
In eight antenna systems, PMI comprises precoding designator i1 and i2; In four antenna systems, PMI comprises single PMI;
Feedback module 34 is connected to acquisition module 32, be used for terminal on PUSCH according to feedback on reservation pattern feeding back channel state information.
Feedback module 34 is used for feeding back channel state information on PUSCH, and this channel condition information comprises:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
Wherein, a described M subband can be discontinuous subband, also can be continuous subband.
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 this terminal comprises information determination module and feedback information module; Wherein,
The information determination module is used for terminal and determines channel condition information, and determines feedback method according to indication information.
The feedback information module is connected to the information determination module, is used for according to described feedback method, by PUSCH the determined channel condition information of information determination module is sent to the base station.
Preferably, indication information is the high-rise configuration signal information that the base station sends.
Preferably, the information determination module is used for determining according to indication information the associating RI of broadband RI and M subband; The feedback information module then is used for the associating RI of described broadband RI and M subband is sent to the base station.
Preferably, the information determination module can be determined CQI and PMI according to the associating RI of up-to-date broadband RI and M subband.CQI can comprise the CQI of each subband in broadband CQI and M subband CQI or M the subband, and PMI can comprise single PMI or precoding designator i1 and i2.
Need to prove that the terminal of describing in the foregoing description is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, do not repeat them here.
In sum as seen, no matter be method or device, channel condition information feedback technique of the present invention, can determine channel condition information according to channel information, select corresponding feedback model according to reporting mode, and use this feedback model feeding back channel state information, solve the poor problem of the bigger systematic function that causes of channel information feedback method expense in the prior art, thereby improved the performance of feedback accuracy and communication system.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (15)
1. a channel state information feedback method is characterized in that, this method comprises:
Terminal is obtained channel condition information, and capable physically shared channel PUSCH upward feeds back described channel condition information according to the feedback on reservation pattern;
Wherein, described channel condition information comprise following one of at least: channel quality indication (CQI) information CQI, precoding matrix indicators information PMI, order indicator information RI; Described RI comprises M the associating RI on the subband;
In four antenna systems, described PMI information is single PMI; In eight antenna systems, described PMI information comprises precoding matrix indicators information i1 and i2.
2. method according to claim 1 is characterized in that, the channel condition information that terminal is fed back comprises:
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
3. method according to claim 2 is characterized in that, a described M subband is discontinuous subband.
4. method according to claim 1 is characterized in that, the channel condition information that terminal is fed back comprises:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised.
5. method according to claim 4 is characterized in that, a described M subband is continuous subband.
6. according to each described method of claim 2 to 5, it is characterized in that,
Described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the precoding designator i1 on broadband CQI, broadband P MI, the described broadband width, the described broadband width.
7. method according to claim 6 is characterized in that,
Described broadband CQI comprises one of following and combination: broadband CQI, broadband differential CQI; This differential CQI is the differential CQI between the different streams of code words;
Differential CQI between the described streams of code words is: when two streams of code words, the broadband CQI of second streams of code words is based on the differential CQI of first streams of code words broadband CQI.
8. according to each described method of claim 2 to 5, it is characterized in that,
The CQI of each subband comprises one of following and combination on the described M subband: the differential CQI of each subband on absolute CQI, the M subband of each subband on M subband; This differential CQI is one of following: based on the differential CQI of broadband CQI; Differential CQI based on one of them subband CQI; Differential CQI based on the associating CQI of M subband; Differential CQI between the different streams of code words;
Differential CQI between the described streams of code words is: when two streams of code words, the subband CQI of second streams of code words is based on the differential CQI of the corresponding subband CQI of first streams of code words.
9. method according to claim 8 is characterized in that,
Associating CQI on the described M subband comprises one of following and combination: the associating differential CQI on associating CQI, the M subband on M subband; This differential CQI is one of following: based on the differential CQI of broadband CQI; Differential CQI between the different streams of code words;
Differential CQI between the described streams of code words is: when two streams of code words, the associating CQI of the M of second a streams of code words subband is based on the differential CQI of associating CQI of M subband of first streams of code words.
10. a channel condition information feedback device is characterized in that, this device comprises:
Acquisition module is used for terminal and obtains channel condition information;
Feedback module is used for terminal and feeds back described channel condition information according to the feedback on reservation pattern on PUSCH.
11. device according to claim 10 is characterized in that, described feedback module is used for feeding back following channel condition information according to one of following feedback system on PUSCH:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Wherein, M is less than the subband number that system bandwidth comprised,
The applied M of a described feedback module subband is discontinuous subband;
Wherein, described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the precoding designator i1 on broadband CQI, broadband P MI, the described broadband width, the described broadband width;
Perhaps, described feedback module is used for feeding back following channel condition information according to one of following feedback model on PUSCH:
Associating RI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information i2 of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information i2 on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband; Perhaps,
Associating RI on associating CQI on the associating precoding matrix indicators information PMI on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on associating CQI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband and M the subband; Perhaps,
Associating RI on the precoding matrix indicators information PMI of each subband on the broad-band channel information, M subband, M subband on the CQI of each subband and M the subband;
Wherein, M is less than subband number that system bandwidth comprised;
The applied M of a described feedback module subband is continuous subband;
Described broad-band channel information comprises one of following and combination: precoding designator i2, broadband RI on the precoding designator i1 on broadband CQI, broadband P MI, the described broadband width, the described broadband width.
12. a terminal is characterized in that, this terminal comprises information determination module and feedback information module; Wherein,
Described information determination module is used for determining channel condition information, and determines feedback method according to indication information;
Described feedback information module is used for according to described feedback method, by PUSCH the determined channel condition information of information determination module is sent to the base station.
13. terminal according to claim 12 is characterized in that, described information determination module is used for determining associating RI on broadband RI and M the subband according to indication information; And determine CQI and PMI according to the associating RI on up-to-date broadband RI and M the subband.
14. terminal according to claim 12 is characterized in that, described feedback module is used for the associating RI on described broadband RI and M the subband, and CQI and PMI information are sent to the base station.
15. terminal according to claim 14 is characterized in that,
Described indication information is the high-rise configuration signal information that the base station sends;
Described CQI comprises one of following and combination: the CQI of each subband in the associating CQI of broadband CQI, a M subband and M the subband;
In four antenna systems, described PMI comprises one of following and combination: the PMI of each subband on associating PMI, the M subband of broadband P MI, a M subband;
In eight antenna systems, described PMI comprises one of following and combination: the i2 of each subband on associating i2, the M subband of broadband i1, broadband i2, a M subband.
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