CN102291217B - The dynamical feedback method and system of long-term channel status information - Google Patents
The dynamical feedback method and system of long-term channel status information Download PDFInfo
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Abstract
The invention discloses a kind of dynamical feedback method of long-term channel status information, including: UE determines whether to feed back long-term CSI to network side, and will determine result notice network side.The present invention discloses the dynamic feedback system of a kind of long-term channel status information, described system includes determining unit and notification unit；Described determine that unit and notification unit are arranged in UE；Wherein it is determined that unit, it is used to determine whether to feed back long-term channel status information CSI to network side；Notification unit, for by the described determination result notice network side determining unit.In the present invention, by being compared previously in long-term CSI by current long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side；Further, determining to the network side long-term CSI of feedback, it is possible to feed back neatly, and feedback overhead can be saved.
Description
Technical field
The present invention relates to the technology of long-term channel status information (Long-TermChannelStateInformation), particularly relate to the dynamical feedback method and system of a kind of long-term channel status information.
Background technology
At Long Term Evolution (LTE, LongTermEvolution) in system, base station (eNB) and subscriber equipment (UE, UserEquipment) a basic code book (basecodebook) is had between, UE is by a certain criterion, for instance maximum Signal to Interference plus Noise Ratio (SINR, SignaltoInterferenceplusNoiseRatio), select suitable pre-coding matrix index (PMI, PrecodingMatrixIndex).LTE system realizes precoding by the UE mode feeding back PMI at eNB end, thus promoting the performance of system.One basic code book can be considered single-stage (singlerank) or multistage (multiplerank) approximate efficient channel option (option) of one group of non-correlation channel.But, these code books design exclusively for specific transmitter, and this meaning, they are fixing code books, it is impossible to enough change along with the change of channel adaptively.
In senior Long Term Evolution (LTE-A or LTE-Advanced, LongTermEvolutionAdvanced) system, eNB can pass through to feed back long-term channel status information (such as space, Time correlation matrix) and improve the performance of system.By adapting to the feature of actual correlated channels, basis code book can convert according to statistical correlation knowledge, for instance code book converts.ENB obtains the common method of long-term channel status information, receives the feedback report from the up transmission of UE.Although from performance perspective, this method is very attractive, but its extra signaling consumption will be inevitable.
Along with popularizing of wireless communication technology and improving constantly of service bandwidth, radio spectrum resources is also fewer and feweri, therefore, how can improve performance for wireless communications, and the expense that can reduce again signaling is the principle that current communication system is acted on.The uplink feedback of UE is necessary, but its signaling consumption cannot be evaded, if its signaling consumption can be cut down, has saved the frequency spectrum resource of preciousness undoubtedly.
Summary of the invention
In view of this, present invention is primarily targeted at the dynamical feedback method and system that a kind of long-term channel status information is provided, realize to dynamic the feedback of long-term CSI, and can saving signaling expense.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
A kind of dynamical feedback method of long-term channel status information, including:
User equipment (UE) determines whether to feed back long-term channel status information CSI to network side, and will determine result notice network side.
Preferably, UE determines whether to feed back long-term CSI to network side, for:
Being compared previously in long-term CSI by current long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side, does not otherwise feed back this long-term CSI.
Preferably, described method also includes:
When described UE determines to network side feedback long-term CSI, feed back or press long-term CSI described in network side indication feedback.
Preferably, described will determine result notice network side, for:
Described UE is by whether notification message notice network side feeds back long-term CSI to network side；
Or, described UE arranges, in the message carrying described long-term CSI, the instruction information whether carrying described long-term CSI, indicates whether to carry described long-term CSI.
Preferably, when described UE determines to network side feedback long-term CSI, feed back described long-term CSI, for:
Described UE feeds back long-term CSI by the notification message notice lateral network side of network, and carries described long-term CSI in the kth subframe after the subframe carrying described notification message, and feeds back to network side；Wherein, k set in advance determines value；
Or, when described UE determines to network side feedback long-term CSI, 1 subframe of kth after the current frame carries described long-term CSI, and feeds back to network side；Wherein, k1 set in advance determines value.
Preferably, when described UE determines to network side feedback long-term CSI, by CSI long-term described in network side indication feedback, for:
Described UE feeds back long-term CSI by the notification message notice lateral network side of network；
In network side 2 subframes of kth after the subframe carrying described notification message, carrying indicates whether described UE feeds back the information of described long-term CSI；
When network side indicates information to indicate described UE to feed back described long-term CSI, described UE carries described long-term CSI in 3 subframes of kth after bearer network side indicates the subframe of information, and feeds back to network side；And feed back to network side；Wherein, k2, k3 are and set in advance determine value.
Preferably, described k, k1, k2 and k3 are in frequency division multiplexing (FDD, FrequencyDivisionDuplex) system-frame, for steady state value, and in time division multiplex (TDD, TimeDivisionDuplex) system-frame, determine according to system-frame uplink-downlink configuration mode.
Preferably, when described UE feeds back long-term CSI, also feed back short-term PMI in the lump.
The dynamic feedback system of a kind of long-term channel status information, including determining unit and notification unit；Described determine that unit and notification unit are arranged in UE；Wherein,
Determine unit, be used to determine whether to feed back long-term channel status information CSI to network side；
Notification unit, for by the described determination result notice network side determining unit.
Preferably, described determining that current long-term CSI is compared by unit further previously in long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side, does not otherwise feed back this long-term CSI.
Preferably, described system also includes:
Feedback unit, for when determining that unit is determined to the network side long-term CSI of feedback, feeding back or press long-term CSI described in network side indication feedback.
Preferably, especially by notification message, described notification unit notifies whether network side feeds back long-term CSI to network side；
Or, described notification unit sends the message of described long-term CSI to network side；Wherein, the instruction information whether carrying described long-term CSI is set in the message carrying described long-term CSI, indicates whether to carry described long-term CSI.
Preferably, described notification unit feeds back long-term CSI by the notification message notice lateral network side of network, and described feedback unit carries described long-term CSI in the kth subframe after the subframe carrying described notification message, and feeds back to network side；Wherein, k set in advance determines value；
Or, described determine unit determine to network side feed back long-term CSI time, described feedback unit 1 subframe of kth after the current frame carries described long-term CSI, and feeds back to network side；Wherein, k1 set in advance determines value.
Preferably, described notification unit feeds back long-term CSI by the notification message notice lateral network side of network；
Described system also includes transmitting element, is arranged at network side, indicates whether described UE feeds back the information of described long-term CSI for carrying in 2 subframes of kth after the subframe carrying described notification message；
When the information of instruction indicates described UE to feed back described long-term CSI, described feedback unit carries described long-term CSI in 3 subframes of kth after bearer network side indicates the subframe of information, and feeds back to network side；And feed back to network side；Wherein, k2, k3 are and set in advance determine value.
In the present invention, by being compared previously in long-term CSI by current long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side；Further, determining to the network side long-term CSI of feedback, it is possible to feed back neatly, and feedback overhead can be saved.
Accompanying drawing explanation
Fig. 1 is the flow chart of the dynamical feedback method of long-term channel status information of the present invention；
Fig. 2 is the first composition structural representation of the dynamic feedback system of long-term channel status information of the present invention；
Fig. 3 is the second composition structural representation of the dynamic feedback system of long-term channel status information of the present invention；
Fig. 4 is the third composition structural representation of the dynamic feedback system of long-term channel status information of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, by the following examples also with reference to accompanying drawing, the present invention is described in more detail.
Fig. 1 is the flow chart of the dynamical feedback method of long-term channel status information of the present invention, as it is shown in figure 1, the dynamical feedback method of long-term channel status information of the present invention comprises the following steps:
Step 101, UE determines whether to feed back long-term channel status information CSI to network side, and will determine result notice network side.
Concrete, current long-term CSI is compared by UE previously in long-term CSI, and difference feeds back this long-term CSI beyond when setting threshold value to network side, does not otherwise feed back this long-term CSI.Such as, the threshold value of diversity factor can be set, carry out uplink feedback beyond when setting threshold value, otherwise do not carry out uplink feedback.
UE is by whether notification message notice network side feeds back long-term CSI to network side；Concrete, notification message can be carried in the PUCCH in subframe or in other up channels.Notification message can be newly-increased notification message, or utilizes existing message as notification message.
Certainly, UE can also arrange, in the message carrying described long-term CSI, the instruction information whether carrying described long-term CSI, indicates whether to carry described long-term CSI.Namely, when sending long-term CSI, whether be comprise long-term CSI, as arranged special indicating bit wherein, namely can be determined whether to comprise long-term CSI by parsing indicating bit if arranging in instruction transmitted information.
Concrete, when UE feeds back long-term CSI, the subframe behind setting interval after the subframe of carrying notification message carries long-term CSI；Or behind the setting interval after receiving the subframe at instruction information place of network side, subframe carries long-term CSI.
Above-mentioned long-term CSI, including the correlation matrix of channel information, or includes correlation matrix and the PMI of PMI.
Step 102, network side receives the long-term CSI of UE feedback, or instruction UE carries out the feedback of long-term CSI again, and UE carries out the feedback of long-term CSI by network side instruction.
By the following examples, the essence of technical solution of the present invention it is further elucidated with.
Embodiment one
This example specifically includes following steps.
Step 1, obtains diversity factor threshold value R0 according to practical situation emulation, test；Here, the threshold value R0 threshold value by the modes such as the emulation of practical communication system and dependence test are obtained, be primarily used to weigh current long-term CSI previously in long-term CSI between diversity factor.This value is an empirical value.It will be appreciated by those skilled in the art that the setting of above-mentioned R0 is easily to realize.
Step 2, subscriber equipment (UE) first calculates chordal distance L, and circular has a variety of, adopts the prior art that those skilled in the art are familiar with to realize.This chordal distance L be current long-term CSI previously in long-term CSI between actual variance degree.
Step 3, it is assumed that at subframe n0Correlation matrix corresponding to moment is R (n0), correlation matrix corresponding to subframe n moment is R (n), and the original code book at eNB and UE end is PMI.In the subframe n moment, need not feeding back if UE measures, namely L < R0, UE still adopt previous long-term channel information R (n0) it is code book conversion, i.e. R (n0) × PMI, namely has only to PMI corresponding to feedback, does not feed back Long-TermCSI；
Step 4, UE Physical Uplink Control Channel (PUCCH on subframe n, the instruction information of 1bit is set on PhysicalUplinkControlChannel), to indicate whether to feed back long-term CSI to network side, such as, when this instruction information is 0, notice eNodeB need not receive long-term CSI feedback information in the n-th+k sub-frame of uplink, and eNodeB preserves the last long-term CSI information R (n received0) until update next time, then with long-term CSI information R (n0) remove the PMI of the short-term of correction feedback.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 1 according to different configurations and subframe when TDD.
Table 1
In table 1, the configuration mode of tdd frame has 7 kinds, and each frame has 10 subframes.For configuration mode " 0 ", when n is the 2nd subframe, k is 4, and when n is the 3rd subframe, k is 7；When n is the 4th subframe in frame, k is 6, and when n is the 7th subframe, k is 4；When n is the 8th subframe, k is 7；When n is the 9th subframe, k is 6.The frame of other configuration modes and k value as before, repeat no more here.
Step 5, if needing to feed back long-term CSI, i.e. L > R0, UE adopts current Long-TermCSI, R (n) to do code book conversion, and namely R (n) × PMI generates and updates code book, UE can adopt maximum SINR, selects the PMI of correspondence in updating code book.Need PMI and the R (n) that feedback is corresponding；
Step 6, at this moment on UE PUCCH on subframe n, 1bit information is 1, notice eNodeB needs to receive long-term channel information R (n) in the sub-frame of uplink of the n-th+k, eNodeB preserves the UE R (n) feed back at the n-th+k sub-frame of uplink until update next time, and the R (n) that then use receives removes the PMI of the short-term of correction feedback.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 1 according to different configurations and subframe when TDD.
Step 7, receiving terminal, according to the control information received, decides whether to update Long-TermCSI, thus doing next step code book conversion.In eNodeB end, the difference according to feedback system, currently employed Long-TermCSI is probably R (n0) or R (n) do code book conversion, and the code word finding PMI corresponding does precoding；
Step 8, repeats step 3 and is worth step 6.
Embodiment two
This example specifically includes following steps.
Step 1, obtains threshold value R0 according to practical situation emulation, test；This step is identical with the step 1 in embodiment one；
Step 2, first calculates chordal distance L at receiving terminal (UE), and circular has a lot, repeats no more here；This step is identical with the step 2 in embodiment one；
Step 3, it is assumed that at subframe n0Correlation matrix corresponding to moment is R (n0), correlation matrix corresponding to subframe n moment is R (n), and the original code book at eNodeB and UE end is PMI.In the subframe n moment, if long-term CSI need not be fed back, namely L < R0, UE still adopt previous long-term channel information R (n0) it is code book conversion, i.e. R (n0) × PMI, namely has only to PMI corresponding to feedback, does not feed back Long-TermCSI；
Step 4, at this moment the information of the flag of the 1bit on UE PUCCH on subframe n is 0, notice eNodeB need not receive long-term CSI and the short-term PMI feedback information combined in the n-th+k sub-frame of uplink, and eNodeB preserves the last long-term CSI information R (n received0) until update next time, then with long-term CSI information R (n0) remove the PMI of the short-term of correction feedback.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 1 according to different configurations and subframe when TDD.
Step 5, if needing to feed back long-term CSI, i.e. L > R0, UE adopts current Long-TermCSI, R (n) to do code book conversion, and namely R (n) × PMI generates and updates code book, UE can adopt maximum SINR, selects the PMI of correspondence in updating code book.Need PMI and the R (n) that feedback is corresponding.
Step 6, at this moment on UE PUCCH on subframe n, 1bit information is 1, notice eNodeB needs to receive PMI and R (n) in the n-th+k sub-frame of uplink, eNodeB preserves the UE R (n) feed back at the n-th+k sub-frame of uplink until update next time, and the R (n) that then use receives removes the PMI of the short-term of correction feedback.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 1 according to different configurations and subframe when TDD.
Step 7, receiving terminal, according to the control information received, decides whether to update Long-TermCSI, thus doing next step code book conversion.In eNodeB end, the difference according to feedback system, currently employed Long-TermCSI is probably R (n0) or R (n) do code book conversion, and the code word finding PMI corresponding does precoding；
Step 8, repeats step 3 and is worth step 6.
Embodiment three
This example specifically includes following steps.
Step 1, obtains threshold value R0 according to practical situation emulation, test；This step is identical with the step 1 in embodiment one；
Step 2, first calculates chordal distance L at receiving terminal (UE), and circular has a lot, repeats no more here；This step is identical with the step 2 in embodiment one；
Step 3, it is assumed that at subframe n0Correlation matrix corresponding to moment is R (n0), correlation matrix corresponding to subframe n moment is R (n), and the original code book at eNodeB and UE end is PMI.In the subframe n moment, if long-term CSI need not be fed back, namely L < R0, UE still adopt previous long-term channel information R (n0) it is code book conversion, i.e. R (n0) × PMI, namely has only to PMI corresponding to feedback, does not feed back Long-TermCSI；
Step 4, the information of the flag of the 1bit at this moment increased on UE PUCCH on subframe n is 0, and notice eNodeB need not update long-term CSI, and then eNodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates bit to set to 0.ENodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates the 1bit information that bit value is not exclusively fed back by UE to control, it is also possible to decided whether to put 1 by eNodeB.If UE is when the CQI receiving eNodeB is designated as 1, it is judged that in the n-th subframe, the 1bit information of the PUCCH of feedback is 0 or 1, if 0 feedback short-term PMI, if the channel information that 1 feedback is long-term.In this example, namely determined whether the feedback carrying out long-term CSI by network side, not only but by UE determine and directly notify network side.k0Value time alternatively, can also be designed respectively according to FDD and TDD, for instance, k0A value of 1 to 10, k it is constantly equal to when FDD0Select according to different configurations and subframe when TDD.Then UE is at the n-th+k0Not feeding back long-term CSI information in+k sub-frame of uplink, eNode preserves the CSI information R (n fed back successively recently0) until update next time, then long-term CSI information R (n0) remove the PMI of the short-term of correction feedback.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 2 according to different configurations and subframe when TDD.
Table 2
In table 2, the configuration mode of tdd frame has 7 kinds, and each frame has 10 subframes.For configuration mode " 0 ", when n is the 0th subframe, k is 4, and when n is the 1st subframe, k is 6；When n is the 5th subframe in frame, k is 4, and when n is the 6th subframe, k is 6.The frame of other configuration modes and k value as before, repeat no more here.
Step 5, if needing to feed back long-term CSI, i.e. L > R0, UE adopts current Long-TermCSI, R (n) to do code book conversion, and namely R (n) × PMI generates and updates code book, UE can adopt maximum SINR, selects the PMI of correspondence in updating code book.Need PMI and the R (n) that feedback is corresponding；
Step 6, the 1bit information at this moment increased on UE PUCCH on subframe n is 1, and notice eNodeB needs to update long-term CSI, and then eNodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates bit to put 1.ENodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates the 1bit information that bit value is not exclusively fed back by UE to control, it is also possible to decided whether to put 1 by eNodeB.If UE is when the CQI receiving eNodeB is designated as 1, on subframe n, the PUCCH1bit information of feedback is 0 or 1, if 0 feedback short-term PMI, if the channel information that 1 feedback is long-term.k0Value time alternatively, can also be designed respectively according to FDD and TDD, for instance, k0A value of 1 to 10, k it is constantly equal to when FDD0Select according to different configurations and subframe when TDD.Then UE is at the n-th+k0Feeding back long-term CSI feedback information in+k sub-frame of uplink, eNodeB preserves until update next time after receiving long-term CSI, then removes the PMI of the short-term of correction feedback with the long-term CSI received.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 2 according to different configurations and subframe when TDD.
Step 7, receiving terminal, according to the control information received, decides whether to update Long-TermCSI, thus doing next step code book conversion.In eNodeB end, the difference according to feedback system, currently employed Long-TermCSI is probably R (n0) or R (n) do code book conversion, and the code word finding PMI corresponding does precoding；
Step 8, repeats step 3 and is worth step 6.
Embodiment four
This example specifically includes following steps.
Step 1, obtains threshold value R0 according to practical situation emulation, test；This step is identical with the step 1 in embodiment one；
Step 2, first calculates chordal distance L at receiving terminal (UE), and circular has a lot, repeats no more here；This step is identical with the step 2 in embodiment one；
Step 3, it is assumed that at subframe n0Correlation matrix corresponding to moment is R (n0), correlation matrix corresponding to subframe n moment is R (n), and the original code book at eNodeB and UE end is PMI.In the subframe n moment, if long-term CSI need not be fed back, namely L < R0, UE still adopt previous long-term channel information R (n0) it is code book conversion, i.e. R (n0) × PMI, namely has only to PMI corresponding to feedback, does not feed back Long-TermCSI；
Step 4, the information of the flag of the 1bit at this moment increased on UE PUCCH on subframe n is 0, and notice eNodeB need not update long-term CSI, and then eNodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates bit to set to 0.ENodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates the 1bit information that bit value is not exclusively fed back by UE to control, it is also possible to decided whether to put 1 by eNodeB.If UE is when the CQI receiving eNodeB is designated as 1, it is judged that in the n-th subframe, the PUCCH1bit information of feedback is 0 or 1, if 0 feedback short-term PMI, if 1 feeds back long-term channel information and short-term PMI information.k0Value time alternatively, can also be designed respectively according to FDD and TDD, for instance, k0A value of 1 to 10, k it is constantly equal to when FDD0Select according to different configurations and subframe when TDD.Then UE is at the n-th+k0Not feeding back long-term CSI information and short-term PMI information in+k sub-frame of uplink, eNodeB preserves the CSI information R (n fed back successively recently0) until update next time, then long-term CSI information R (n0) remove the PMI of the short-term of correction feedback.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 2 according to different configurations and subframe when TDD.
Step 5, if needing to feed back long-term CSI, i.e. L > R0, UE adopts current Long-TermCSI, R (n) to do code book conversion, and namely R (n) × PMI generates and updates code book, UE can adopt maximum SINR, selects the PMI of correspondence in updating code book.Need PMI and the R (n) that feedback is corresponding；
Step 6, the 1bit information at this moment increased on UE PUCCH on subframe n is 1, and notice eNodeB needs to update long-term CSI, and then eNodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates bit to put 1.ENodeB is in kth0The CQI of the DCIFormat0 of individual subframe indicates the 1bit information that bit value is not exclusively fed back by UE to control, it is also possible to decided whether to put 1 by eNodeB.If UE is when the CQI receiving eNodeB is designated as 1, in the n-th subframe, the PUCCH1bit information of feedback is 0 or 1, if 0 feedback short-term PMI, if 1 feeds back long-term channel information and short-term channel information.k0Value time alternatively, can also be designed respectively according to FDD and TDD, for instance, k0A value of 1 to 10, k it is constantly equal to when FDD0Select according to different configurations and subframe when TDD.Then UE is at the n-th+k0Feeding back the PMI information of long-term CSI feedback information R (n) and short-term in+k sub-frame of uplink, eNodeB preserves until update next time after receiving long-term CSI, then removes the PMI of the short-term of correction feedback with the long-term CSI received.The value of k can be designed respectively according to FDD and TDD, for instance, k is constantly equal to 4, k when FDD to carry out selecting as shown in table 2 according to different configurations and subframe when TDD.
Step 7, receiving terminal, according to the control information received, decides whether to update Long-TermCSI, thus doing next step code book conversion.In eNodeB end, the difference according to feedback system, currently employed Long-TermCSI is probably R (n0) or R (n) do code book conversion, and the code word finding PMI corresponding does precoding；
Step 8, repeats step 3 and is worth step 6.
Embodiment five
This example specifically includes following steps.
Step 1, obtains threshold value R0 according to practical situation emulation, test；This step is identical with the step 1 in embodiment one；
Step 2, first calculates chordal distance L at receiving terminal (UE), and circular has a lot, repeats no more here；This step is identical with the step 2 in embodiment one；
Step 3, it is assumed that at subframe n0Correlation matrix corresponding to moment is R (n0), correlation matrix corresponding to subframe n moment is R (n), and the original code book at eNodeB and UE end is PMI.In the subframe n moment, if long-term CSI need not be fed back, namely L < R0, UE still adopt previous long-term channel information R (n0) it is code book conversion, i.e. R (n0) × PMI, namely has only to PMI corresponding to feedback, does not feed back Long-TermCSI；
Step 4, UE is at subframe n+k1Feedback PMI information, k1Value be alternatively, can also be designed respectively according to FDD and TDD, for instance, k1A value of 1 to 10, k it is constantly equal to when FDD1Select according to different configurations and subframe when TDD.What eNodeB need not be known a priori by UE feedback by signaling is the PMI information of long-term CSI or short-term.By a kind of dominant or recessive mode, eNodeB can know that channel information is long-term CSI information or the PMI information of short-term.Such as a kind of dominant instruction: needing to define a kind of new UCI form, namely the bit number of PMI to increase 1bit feedback information on original UCI basis is 0.ENodeB carries out a series of processes such as a series of demapping, demodulation, detection, decoding after receiving the UE channel information fed back, it is judged that first bit (MSB) of channel information is the PMI1 of 0 explanation UE feedback.The long-term CSI of preservation last update goes the PMI of the short-term of correction feedback to obtain the precoding weights next time transmitted.
Step 5, if needing to feed back long-term CSI, i.e. L > R0, UE adopts current Long-TermCSI, R (n) to do code book conversion, and namely R (n) × PMI generates and updates code book, UE can adopt maximum SINR, selects the PMI of correspondence in updating code book.Need PMI and the R (n) that feedback is corresponding；
Step 6, UE is at subframe n+k1Feedback PMI2 information, k1Value be alternatively, can also be designed respectively according to FDD and TDD, for instance, k1A value of 1 to 10, k it is constantly equal to when FDD1Select according to different configurations and subframe when TDD.What eNodeB need not be known a priori by UE feedback by signaling is the PMI information of long-term CSI or short-term.By a kind of dominant or recessive mode, eNodeB can know that channel information is long-term CSI information or the PMI information of short-term.ENodeB has only in kth0The CQI of the DCIFormat0 of individual subframe indicates bit to put 1.Such as a kind of dominant instruction: needing to define a kind of new UCI form, namely the bit number of PMI to increase 1bit feedback information on original UCI basis is 1.ENodeB carries out a series of processes such as a series of demapping, demodulation, detection, decoding after receiving the UE channel information fed back, first bit (MSB) judging channel information is 0, the UE PMI1 (short-term channel information) fed back is described, if 1 illustrates the PMI2 (long-term channel information) of UE feedback.UE utilizes PMI2 to update long-term CSI, then utilizes the long-term CSI of renewal to go the PMI of short-term of correction feedback to obtain the precoding weights next time transmitted.
Step 7, receiving terminal, according to the control information received, decides whether to update Long-TermCSI, thus doing next step code book conversion.In eNodeB end, the difference according to feedback system, currently employed Long-TermCSI is probably R (n0) or R (n) do code book conversion, and the code word finding PMI corresponding does precoding；
Step 8, repeats step 3 and is worth step 6.
Embodiment six
This example specifically includes following steps.
Step 1, obtains threshold value R0 according to practical situation emulation, test；This step is identical with the step 1 in embodiment one；
Step 2, first calculates chordal distance L at receiving terminal (UE), and circular has a lot, repeats no more here；This step is identical with the step 2 in embodiment one；
Step 3, it is assumed that at subframe n0Correlation matrix corresponding to moment is R (n0), correlation matrix corresponding to subframe n moment is R (n), and the original code book at eNodeB and UE end is PMI.In the subframe n moment, if long-term CSI need not be fed back, namely L < R0, UE still adopt previous long-term channel information R (n0) it is code book conversion, i.e. R (n0) × PMI, namely has only to PMI corresponding to feedback, does not feed back Long-TermCSI；
Step 4, the information of the flag of the 1bit at this moment increased on UE PUCCH on subframe n is 0, notice eNodeB, in the PMI next time fed back, broadband P MI part is the broadband P MI of short-term, after eNodeB receives the channel information of UE feedback, the long-term CSI of preservation last update goes the PMI of the short-term of correction feedback to obtain the precoding weights next time transmitted.
Step 5, if needing to feed back long-term CSI, i.e. L > R0, UE adopts current Long-TermCSI, R (n) to do code book conversion, and namely R (n) × PMI generates and updates code book, UE can adopt maximum SINR, selects the PMI of correspondence in updating code book.Need PMI and the R (n) that feedback is corresponding；
Step 6, at this moment the 1bit information increased on UE PUCCH on subframe n is 1, notice eNodeB, in the PMI next time fed back, broadband P MI part is long-term broadband P MI, eNodeB utilizes the long-term CSI of renewal after receiving the UE channel information fed back, go the PMI of the short-term of correction feedback to obtain the precoding weights next time transmitted.
Step 7, receiving terminal, according to the control information received, decides whether to update Long-TermCSI, thus doing next step code book conversion.In eNodeB end, the difference according to feedback system, currently employed Long-TermCSI is probably R (n0) or R (n) do code book conversion, and the code word finding PMI corresponding does precoding；
Step 8, repeats step 3 and is worth step 6.
Fig. 2 is the first composition structural representation of the dynamic feedback system of long-term channel status information of the present invention, as in figure 2 it is shown, the dynamic feedback system of this example long-term channel status information includes determining unit 20 and notification unit 21；Wherein, this determines that unit 20 and notification unit 21 are arranged in UE；Wherein,
Determine unit 20, be used to determine whether to feed back long-term channel status information CSI to network side；
Notification unit 21, for by the described determination result notice network side determining unit.
Above-mentioned determining that current long-term CSI is compared by unit 20 further previously in long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side, does not otherwise feed back this long-term CSI.
Fig. 3 is the second composition structural representation of the dynamic feedback system of long-term channel status information of the present invention, as it is shown on figure 3, on the basis of system shown in Figure 2, the dynamic feedback system of this example long-term channel status information also includes:
Feedback unit 22, for when determining that unit is determined to the network side long-term CSI of feedback, feeding back or press long-term CSI described in network side indication feedback.
Especially by notification message, above-mentioned notification unit 21 notifies whether network side feeds back long-term CSI to network side；
Or, above-mentioned notification unit 21 sends the message of described long-term CSI to network side；Wherein, the instruction information whether carrying described long-term CSI is set in the message carrying described long-term CSI, indicates whether to carry described long-term CSI.
Above-mentioned notification unit 21 feeds back long-term CSI by the notification message notice lateral network side of network, and described feedback unit carries described long-term CSI in the kth subframe after the subframe carrying described notification message, and feeds back to network side；Wherein, k set in advance determines value；
Or, it is determined that when unit 20 is determined to network side feedback long-term CSI, above-mentioned feedback unit 22 1 subframe of kth after the current frame carries described long-term CSI, and feeds back to network side；Wherein, k1 set in advance determines value.
Above-mentioned notification unit 21 feeds back long-term CSI by the notification message notice lateral network side of network；Fig. 4 is the third composition structural representation of the dynamic feedback system of long-term channel status information of the present invention, and as shown in Figure 4, on the basis of system shown in Figure 3, the dynamic feedback system of this example long-term channel status information also includes:
Transmitting element 23, is arranged at network side, indicates whether described UE feeds back the information of described long-term CSI for carrying in 2 subframes of kth after the subframe carrying described notification message；
When the information of instruction indicates described UE to feed back described long-term CSI, described feedback unit carries described long-term CSI in 3 subframes of kth after bearer network side indicates the subframe of information, and feeds back to network side；And feed back to network side；Wherein, k2, k3 are and set in advance determine value.
Skilled artisan would appreciate that, the dynamic feedback system of long-term channel status information of the present invention is to design for realizing the dynamical feedback method of aforesaid long-term channel status information, and the function that realizes of above-mentioned each processing unit can refer to the associated description of preceding method and understands.The function of each processing unit in figure can be realized by the program that runs on processor, it is possible to is realized by concrete logic circuit.
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.
Claims (8)
1. the dynamical feedback method of a long-term channel status information, it is characterised in that described method includes:
User equipment (UE) determines whether to feed back long-term channel status information CSI to network side, and will determine result notice network side；
Wherein, when described UE determines to network side feedback long-term CSI, feed back or press long-term CSI described in network side indication feedback；
Wherein, when described UE determines to network side feedback long-term CSI, by CSI long-term described in network side indication feedback, for:
Described UE feeds back long-term CSI by the notification message notice lateral network side of network；
In network side 2 subframes of kth after the subframe carrying described notification message, carrying indicates whether described UE feeds back the information of described long-term CSI；
When network side indicates information to indicate described UE to feed back described long-term CSI, described UE carries described long-term CSI in 3 subframes of kth after bearer network side indicates the subframe of information, and feeds back to network side；Wherein, k2, k3 are and set in advance determine value；
Described UE determines whether to feed back long-term CSI to network side, for:
Being compared previously in long-term CSI by current long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side, does not otherwise feed back this long-term CSI.
2. method according to claim 1, it is characterised in that described will determine result notice network side, for:
Described UE is by whether notification message notice network side feeds back long-term CSI to network side；
Or, described UE arranges, in the message carrying described long-term CSI, the instruction information whether carrying described long-term CSI, indicates whether to carry described long-term CSI.
3. method according to claim 1, it is characterised in that when described UE determines to network side feedback long-term CSI, feed back described long-term CSI, for:
Described UE feeds back long-term CSI by the notification message notice lateral network side of network, and carries described long-term CSI in the kth subframe after the subframe carrying described notification message, and feeds back to network side；Wherein, k set in advance determines value；
Or, when described UE determines to network side feedback long-term CSI, 1 subframe of kth after the current frame carries described long-term CSI, and feeds back to network side；Wherein, k1 set in advance determines value.
4. method according to claim 3, it is characterised in that described k, k1, k2 and k3 are in frequency division multiplexing FDD system frame, for steady state value, and in time division multiplex TDD system frame, determines according to system-frame uplink-downlink configuration mode.
5. method according to claim 1, it is characterised in that when described UE feeds back long-term CSI, also feedback short-term pre-coding matrix indicates PMI in the lump.
6. the dynamic feedback system of a long-term channel status information, it is characterised in that described system includes determining unit and notification unit；Described determine that unit and notification unit are arranged in UE；Wherein,
Determine unit, be used to determine whether to feed back long-term channel status information CSI to network side；
Notification unit, for by the described determination result notice network side determining unit；
Described system also includes:
Feedback unit, for when determining that unit is determined to the network side long-term CSI of feedback, feeding back or press long-term CSI described in network side indication feedback；
Described notification unit, is additionally operable to notify that the lateral network side of network feeds back long-term CSI by notification message；
Described system also includes transmitting element, is arranged at network side, indicates whether described UE feeds back the information of described long-term CSI for carrying in 2 subframes of kth after the subframe carrying described notification message；
When the information of instruction indicates described UE to feed back described long-term CSI, described feedback unit carries described long-term CSI in 3 subframes of kth after bearer network side indicates the subframe of information, and feeds back to network side；Wherein, k2, k3 are and set in advance determine value；
Described determining that current long-term CSI is compared by unit further previously in long-term CSI, difference feeds back this long-term CSI beyond when setting threshold value to network side, does not otherwise feed back this long-term CSI.
7. system according to claim 6, it is characterised in that especially by notification message, described notification unit notifies whether network side feeds back long-term CSI to network side；
Or, described notification unit sends the message of described long-term CSI to network side；Wherein, the instruction information whether carrying described long-term CSI is set in the message carrying described long-term CSI, indicates whether to carry described long-term CSI.
8. system according to claim 6, it is characterized in that, described notification unit feeds back long-term CSI by the notification message notice lateral network side of network, and described feedback unit carries described long-term CSI in the kth subframe after the subframe carrying described notification message, and feeds back to network side；Wherein, k set in advance determines value；
Or, described determine unit determine to network side feed back long-term CSI time, described feedback unit 1 subframe of kth after the current frame carries described long-term CSI, and feeds back to network side；Wherein, k1 set in advance determines value.
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| CN101400074A (en) * | 2007-09-28 | 2009-04-01 | 夏普株式会社 | Method, user equipment and system for reducing feedback quantity of pre-coding matrix index number |
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