CN106033991A - Information feedback method of multi-user MIMO (multiple-input-multiple-output) system - Google Patents
Information feedback method of multi-user MIMO (multiple-input-multiple-output) system Download PDFInfo
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Abstract
The invention provides an information feedback method of a multi-user MIMO system. The method comprises that UE feeds back single-user MIMO channel state information and multi-user MIMO channel state information in a PUSCH (Physical Uplink Shared Channel) simultaneously, and the multi-user MIMO channel state information is positioned after the single-user MIMO channel state information, and comprises MU-PMI, MU-RI and MU-CQI. According to the invention, feedback of the channel state information in the multi-user condition is added, more channel transmission conditions in the multi-user scene can be provided, and the performance of the multi-user MIMO system can be improved effectively.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to the information of a kind of multiuser mimo system
Feedback method.
Background technology
Multiple-input and multiple-output (Multiple Input Multiple Output, MIMO), is to utilize multiple antennas
Suppression channel fading.Multiuser MIMO (Multi User MIMO, MU-MIMO) is by equally
Running time-frequency resource on the multiple user of multiplexing improve power system capacity.In the prior art, the design master of MIMO
If optimizing the performance of Single User MIMO (Single User MIMO, SU-MIMO), to multi-user
The optimization of MIMO the most more considers.In prior art, transmission mode 5 (TM5) is MU-MIMO
Transmission, only employs a simple MU-MIMO mechanism, and its key property is for using based on single user
The precoding of code book, each MU-MIMO user only uses the transmission of order 1 (rank1), CQI (Channel
Quality Information, channel quality information) calculating be that hypothesis based on Single User MIMO obtains
's.The TM9 introduced in R10 achieves switching at runtime in the pattern of SU-MIMO Yu MU-MIMO,
Now each user assumes to be in SU-MIMO, to base station feedback respective PMI (Precoding Matrix
Index, precoding vector index), RI, CQI.Base station is adjusted according to PMI, CQI of user feedback
Degree, selects the user of pairing.Finally, base station carries out the transmission of MU-MIMO to the pairing user chosen.
RI, CQI and PMI information are by physical layer ascending control channel (PUCCH, Physical Uplink Control
Or physical layer Uplink Shared Channel (PUSCH, Physical Uplink Shared Channel) Channel)
To base station feedback.RI, CQI and PMI information periodic feedback on PUCCH, and on PUSCH be
Feedback is triggered by physical layer uplink scheduling authorization order.
During the realization of above-mentioned existing MU-MIMO, owing to UE counts under the hypothesis of SU-MIMO
Calculate and feed back RI/PMI/CQI, eNB and consider that inter-user interference recalculates RI/PMI/CQI, therefore
The performance of MU-MIMO is the lowest, can cause CQI mismatch problem, i.e. the MCS grade of eNB scheduling
Do not mate for the MCS grade of MU-MIMO with UE, lose systematic function.
A kind of method wishing to propose channel condition information feeding back multi-user, it is possible to provide more for base station
The information of multi-user transmission, and then improve the transmission performance of multi-user's multiple-input and multiple-output.
Summary of the invention
The present invention proposes the information feedback method of a kind of multiuser mimo system, and the method is:
On PUSCH channel, UE feedback user's mimo channel status information and multi-user simultaneously
Mimo channel status information, and multiuser MIMO channel condition information be positioned at Single User MIMO letter
After channel state information, described multiuser MIMO status information comprises MU-PMI, MU-RI, MU-CQI.
Preferably, during feedback multiuser MIMO channel condition information, depend on according to the size order of MU-RI
Secondary arrangement order 1～the multi-user information of order R, described multi-user information comprises MU-PMI and MU-CQI,
R is maximum feedback order, and the value of R is less than maximum multi-user's order RmaxAnd current SU-RI, RmaxIt is one
Individual fixed value or by high level to user configure.
Preferably, the feedback kind of multi-user CQI/PMI and feedback bits and single user CQI/PMI is anti-
Feedback type and feedback bits are identical.
Preferably, multi-user's CQI/PMI feedback kind is identical with the feedback kind of single user CQI/PMI,
But the feedback bits of multi-user CQI/PMI is different from the feedback bits of single user CQI/PMI.
Preferably, the feedback kind of multi-user CQI/PMI and the feedback kind of single user CQI/PMI are different.
Preferably, fixing multi-user CQI/PMI is set according to the feedback kind of single user CQI/PMI anti-
Feedback type.
Preferably, the feedback kind of multi-user CQI/PMI is configured to user by high level.
Compared to prior art, invention increases the feedback of channel condition information in the case of multi-user, can
To provide the transmission situation under more multi-user scene, it is simple to reference when eNB does multi-subscriber dispatching,
Determine the UE of pairing, and the pre-coding matrix that pairing UE is used, it is possible to how defeated be effectively improved multi-user
Enter the performance of multiple output system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, retouch below
Accompanying drawing in stating is some embodiments of the present invention, for those of ordinary skill in the art, is not paying
On the premise of creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is that in embodiment 1, single user CQI/PMI and multi-user CQI/PMI all use PUSCH
Mode3-2 feedback kind, eNB be four ports and do not use 4 antennas strengthen code book time feedback bits chart；
Fig. 2 is that in embodiment 2, single user CQI/PMI and multi-user CQI/PMI all use PUSCH
Mode1-2 feedback kind, eNB be four ports and do not use 4 antennas strengthen code book time feedback bits chart；
Fig. 3 is single user CQI/PMI feedback kind and multi-user's CQI/PMI feedback kind in embodiment 3
Matched rule chart；
Fig. 4 is that in embodiment 3, single user CQI/PMI uses PUSCH Mode 1-2 feedback kind, eNB
Be four ports and do not use 4 antennas strengthen code book time feedback bits chart.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that
Described embodiment is a part of embodiment of the present invention rather than whole embodiments；It should be noted that
In the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly fall into the scope of protection of the invention.
Embodiment 1
UE is except by PUSCH channel aperiodic feedback user's mimo channel status information, going back
By PUSCH channel aperiodic feedback multiuser MIMO channel condition information, multiuser MIMO
After channel condition information is positioned at Single User MIMO channel condition information.At feedback multiuser MIMO letter
During channel state information, it is arranged in order MU-CQI, MU-PMI according to MU-RI order from small to large
Information bit, maximum feedback to order is MU-CQI, MU-PMI of R, and the value of R is multiplex less than maximum
Family order RmaxAnd current SU-RI.Present embodiment assumes that RmaxIt is that a fixed value 2 (can also be by high level
Configuration), then MU-CQI and MU-PMI and RI=2 of order feedback RI=1 when RI is more than 1
MU-CQI and MU-PMI.When RI is equal to 1, order feeds back MU-CQI and MU-PMI of RI=1.
In the present embodiment the feedback kind of multi-user CQI/PMI and the feedback kind of single user CQI/PMI and
Feedback bits is identical, multi-user and alone PUSCH Mode 3-2 (the subband CQI of high-rise configuration of employing per family
And subband PMI feedback) type feeds back.ENB be four ports and do not use 4 antennas strengthen code books
When, the feedback bits that both are used is as shown in Figure 1.
Embodiment 2
Different from embodiment 1, in the present embodiment, the feedback kind of multi-user CQI and single user CQI is anti-
Feedback type is identical, but the feedback bits that multi-user CQI uses is different from the feedback bits of single user CQI.
The feedback kind of multi-user and the feedback kind of single user all use PUSCH Mode 1-2, and feedback bits
It is defined as: broadband MU-CQI uses the feedback bits different from broadband SU-CQI, the CQI of its feedback
For the difference of MU-CQI Yu SU-CQI, i.e. broadband MU-CQI value=broadband MU-CQI index
Broadband SU-CQI indexes.
ENB be four ports and do not use 4 antennas strengthen code book when, multi-user and single user institute
The feedback bits used is as shown in Figure 2.
Embodiment 3
Different from embodiment 1, the feedback kind of multi-user CQI/PMI and single user in the present embodiment
The feedback kind of CQI/PMI is different, and mates fixing according to single user CQI/PMI feedback kind
Multi-user's CQI/PMI feedback kind, concrete matched rule is as shown in Figure 3.Single user CQI/PMI uses
PUSCH Mode 1-2 feedback kind, eNB be four ports and do not use 4 antennas strengthen code book time, alone
The feedback bits of family and multi-user is as shown in Figure 4.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can
Completing with the hardware relevant by programmed instruction, aforesaid program can be stored in an embodied on computer readable and deposit
In storage media, this program upon execution, performs to include the step of said method embodiment；And aforesaid storage
Medium includes: the various media that can store program code such as ROM, RAM, magnetic disc or CD.
Last it is noted that above example is only in order to illustrate technical scheme, rather than it is limited
System；Although the present invention being described in detail with reference to previous embodiment, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it, or to it
Middle part technical characteristic carries out equivalent；And these amendments or replacement, do not make appropriate technical solution
Essence departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. an information feedback method for multiuser mimo system, the method is:
On PUSCH channel, UE feedback user's mimo channel status information and multi-user simultaneously
Mimo channel status information, and multiuser MIMO channel condition information be positioned at Single User MIMO letter
After channel state information, described multiuser MIMO status information comprises MU-PMI, MU-RI, MU-CQI.
Method the most according to claim 1, it is characterised in that:
During feedback multiuser MIMO channel condition information, it is arranged in order order according to the size order of MU-RI
1～the multi-user information of order R, it is maximum that described multi-user information comprises MU-PMI and MU-CQI, R
Feedback order, the value of R is less than maximum multi-user's order RmaxAnd current SU-RI, RmaxIt it is a fixed value
Or configured to user by high level.
Method the most according to claim 1 and 2, it is characterised in that: multi-user CQI/PMI's is anti-
Feedback type and feedback bits are identical with the feedback kind of single user CQI/PMI and feedback bits.
Method the most according to claim 1 and 2, it is characterised in that: multi-user CQI/PMI feeds back
Type is identical with the feedback kind of single user CQI/PMI, but the feedback bits of multi-user CQI/PMI and list
The feedback bits of user CQI/PMI is different.
Method the most according to claim 1 and 2, it is characterised in that: multi-user CQI/PMI's is anti-
Feedback type is different from the feedback kind of single user CQI/PMI.
Method the most according to claim 1 and 2, it is characterised in that: according to single user CQI/PMI
Feedback kind fixing multi-user's CQI/PMI feedback kind is set.
Method the most according to claim 1 and 2, it is characterised in that: multi-user CQI/PMI's is anti-
Feedback type is configured to user by high level.
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| US20080132281A1 (en) * | 2006-08-21 | 2008-06-05 | Byoung-Hoon Kim | Approach to a unified su-mimo/mu-mimo operation |
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| CN101741523A (en) * | 2009-12-11 | 2010-06-16 | 中国科学技术大学 | Method for limiting feedback of feedback code word space threshold of multi-user multi-aerial system |
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| CN102195698A (en) * | 2010-01-18 | 2011-09-21 | 捷讯研究有限公司 | Downlink transmission in a multiple-user multiple-input multiple-output MU-MIMO wireless communication system |
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