CN103391127A - Multipoint collaborative information feedback method and device - Google Patents
Multipoint collaborative information feedback method and device Download PDFInfo
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- CN103391127A CN103391127A CN2012101478929A CN201210147892A CN103391127A CN 103391127 A CN103391127 A CN 103391127A CN 2012101478929 A CN2012101478929 A CN 2012101478929A CN 201210147892 A CN201210147892 A CN 201210147892A CN 103391127 A CN103391127 A CN 103391127A
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Abstract
The invention discloses a multipoint collaborative information feedback method and device. An embodiment of the invention provides the method for multipoint collaborative information. The method includes: selecting a sub-band group for multipoint collaborative measuring concentrated channel state information-reference signals CSI-RS resources, wherein the sub-band group at least comprises a sub-band; feeding back identifiers of the selected sub-band group, wherein the identifiers comprise position information of the at least one sub-band in the selected sub-band group. The multipoint collaborative information feedback method and device solves the problem of feedback of every CSI-RS resource on the basis of the multipoint collaborative measuring concentration and has good protocol compatibility.
Description
Technical field
The invention relates to information feedback method and device in radio communication, particularly about information feedback method and the device of multi-point collaboration in wireless communication (CoMP, Coordinated Multi-Point).
Background technology
Coordinated multipoint transmission is Long Term Evolution-senior project (LTE-Advanced, Long Term Evolution-Advanced) very promising technology in, it can effectively reduce the interference (ICI of minizone, and promote covering, cell edge throughput and/or the throughput of system of high data rate inter-cell interference).Multipoint cooperative specifically implement a plurality of dissimilar technical schemes, as cooperative scheduling/wave beam forming (CS/CB, Coordinated Scheduling/Beamforming), dynamic point is selected (DPS, Dynamic Point Selection), joint transmission (JT, Joint Transmission).
And for the transmission mechanism of multipoint cooperative, present agreement is failed to selling the satisfied solution of industry.Take present agreement 36.213 as example, wherein the channel quality indication (CQI, Channel Quality Indicator) of the subband of subscriber equipment (UE, User Equipment) selection is to feed back with the 2-2 pattern.This is acyclic channel condition information (CSI, the Channel State Information) report mechanism on a kind of shared channel of line link physically (PUSCH, Physical Uplink Shared Channel).Subscriber equipment is selected at least one preferred subband, and based on single pre-coding matrix index (PMI of this at least one subband report, Precoding Matrix Indicator)/channel quality indication (CQI, Channel Quality Indicator) and single subband index, thus further dispatch for network side.Problem is, aperiodicity report mechanism on this physical uplink link sharing channel only supports advancing of single residential quarter to have more (MIMO more, Multiplr Inputs Multiple Outputs) and carrier aggregation (CA, Carrier Aggregation) scheme, do not support multipoint cooperative.Thereby also can't meet the requirement of based on each channel condition information-reference signal (CSI-RS, the Channel State Information-Reference Signal) resource that participates in multipoint cooperative, feeding back respectively.
Thereby a kind of desirable multipoint cooperative feedback mechanism becomes the another focus of industry, be also the multipoint cooperative technology further develop one of the problem that must solve.
Summary of the invention
An object of the present invention is to provide a kind of feedback method and device of multipoint cooperative of novelty, solve the feedback problem of multipoint cooperative.
One embodiment of the invention provide a kind of method, are used for the information feedback of multipoint cooperative.The method comprises: be the channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group, this subband group comprises at least one subband; And the identifier of the selected subband group of feedback, this identifier comprises the positional information of this at least one subband in selected subband group.
According to another embodiment of the present invention, the method further comprises the reception top signaling, and it is that CSI-RS resource selection subband group in the measuring set of multipoint cooperative is united and selected or select respectively that this top signaling is indicated this.In one embodiment, this is united and selects to refer to the same subband group of all CSI-RS resource selection in measuring set, selects respectively to refer to each the CSI-RS resource in measuring set is selected respectively subband group.When the multipoint cooperative scheme is joint transmission, should be the associating selection for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative.When the multipoint cooperative scheme is cooperative scheduling/wave beam forming or dynamic point selection, should be to unite to select or select respectively for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative.According to one embodiment of the invention, the method further comprises feedback each CSI-RS resource in measuring set on broadband and the channel condition informations such as the pre-coding matrix index on selected subband group and channel quality indication.In another embodiment, the method is periodicity or acyclic feedback.
Embodiments of the invention also provide a kind of subscriber equipment, are used for the information feedback of multipoint cooperative.This subscriber equipment comprises: the subband group choice device, be the channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group, and this subband group comprises at least one subband; And the identifier feedback device, the identifier of the selected subband group of feedback, this identifier comprises the positional information of at least one subband in selected subband group.
In one embodiment, this subscriber equipment further comprises the top signaling receiving system, receives top signaling; This top signaling is designated as CSI-RS resource selection subband group in the measuring set of multipoint cooperative and unites and select or select respectively.In another embodiment, this subscriber equipment further comprises the information feedback device, and feedback each CSI-RS resource in measuring set is on broadband and the channel condition informations such as the pre-coding matrix index on selected subband group and channel quality indication.
Compared to prior art, the invention provides a kind of information feedback method and device of multipoint cooperative of novelty, it has solved the problem of feeding back based on each CSI-RS resource in the multipoint cooperative measuring set.And the present invention is the identical or different subband group of CSI-RS resource selection in measuring set in the time of can supporting flexibly to adopt different multipoint cooperative scheme, and the identifier of the selected a plurality of or subband group of respective feedback; Thereby be conducive to network side and carry out multipoint cooperative scheduling and other associative operation.
Description of drawings
Fig. 1 is used for the flow chart of the information feedback method of multipoint cooperative according to an embodiment of the invention; And
Fig. 2 is the structured flowchart of subscriber equipment that is used for according to an embodiment of the invention the information feedback of multipoint cooperative.
Embodiment
Spirit for a better understanding of the present invention, be described further it below in conjunction with part preferred embodiment of the present invention.
Along with third generation partner program (3GPP, further developing 3rd Generation Partnership Project), feedback to multipoint cooperative also has some comparatively bright and clear requirements, and one of them is exactly that the feedback of multipoint cooperative should be based on each CSI-RS resource in the multipoint cooperative measuring set.Thereby the present pattern in agreement 36.213, as the 2-2 pattern can not directly transplanting in multipoint cooperative.Especially for the multipoint cooperative that uses the joint transmission scheme, if simply select the CSI-RS resource of subband to list in the multipoint cooperative measuring set by existing mode each, be difficult to the joint transmission processing that realizes that network side is follow-up, as combined dispatching, associating precoding etc.
For this reason, one embodiment of the invention provide a kind of feedback method and device of multipoint cooperative of novelty, it utilizes the capacity sufficient that can carry more feedback informations on the physical uplink shared link, based on each the CSI-RS resource in the multipoint cooperative measuring set, carries out aperiodic or periodic feedback.
Fig. 1 is used for the flow chart of the information feedback method 10 of multipoint cooperative according to an embodiment of the invention.Sequencing when it is pointed out that the step description order of this flow chart and being not equal to border application in fact, should not be regarded as limitation of the present invention.In like manner, other method step that relates in the present invention is also like this.
According to the present embodiment, the method 10 comprises: in step 100, the device that feeds back, receive network side as subscriber equipment, is the CSI-RS resource of its multipoint cooperative measuring set configuration as base station.
In step 101, subscriber equipment is the CSI-RS resource selection subband group in the multipoint cooperative measuring set, and each subband group comprises at least one subband, as M subband.Concrete subband group selection mode can be different according to the multipoint cooperative scheme difference of user equipment applications, also can be identical.
For example, when the multipoint cooperative scheme of subscriber equipment employing is joint transmission, for all the CSI-RS resource selection subband group in the measuring set of multipoint cooperative are associating selections.What is called is united selection and is referred to the same subband group of all CSI-RS resource selection in the multipoint cooperative measuring set.For example, all CSI-RS resources in the multipoint cooperative measuring set, as have two CSI-RS resources, the broadband of using can be divided into S subband, at least one subband wherein, (1≤M≤S) individual subband is a subband group as M.Subscriber equipment can be selected to carry out transmission information for a preferred subband group of all CSI-RS resources in this S subband according to certain criterion such as heap(ed) capacity, maximum signal to noise ratio etc. certainly.Concrete, according to one embodiment of the invention, this the certain criterion that is used for selecting is the heap(ed) capacity criterion, can at first attempt selecting the first subband group in S subband, capacity when in measuring set, these two CSI-RS resources are used this first subband group is assessed, and obtains in measuring set the capacity situation when these two CSI RS resources are applied this first subband group.Then, attempt to select the second subband group in S subband, the capacity when in measuring set, these two CSI-RS resources are used this second subband group is assessed, and obtains in measuring set the capacity situation when these two CSI-RS resources are applied this second subband group.The rest may be inferred, until the capacity that all possible subband group in S subband is applied to the CSI-RS resource in measuring set all carried out assessment.Capacity while then the different sub-band group being applied to all CSI-RS resources in measuring set compares, and finally selects the subband group that wherein the has heap(ed) capacity preferred subband group as all CSI-RS resources in this measuring set according to the heap(ed) capacity criterion.By uniting selection, can avoid as the different subband group of CSI-RS resource selection in the measuring set of multipoint cooperative, cause network side to be difficult to, even can't to carry out combined dispatching, associating precoding, reach the operations such as associating link adaptation.
When the multipoint cooperative scheme is cooperative scheduling/wave beam forming or dynamic point selection, for the channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group is to unite to select or select respectively.The so-called selection respectively refers to each the CSI-RS resource in the multipoint cooperative measuring set is selected respectively subband group, thereby is that the selected subband group of each CSI-RS resource may identical also possibility difference.With aforesaid multipoint cooperative examples of configurations, for all CSI-RS resources in measuring set, the broadband of as two CSI-RS resources, using can be divided into S subband equally, at least one subband wherein, and (1≤M≤S) individual subband is a subband group as M.Subscriber equipment can be surveyed and certainly be respectively the preferred subband group of all CSI-RS resource selection one in this S subband as heap(ed) capacity, maximum signal to noise ratio etc. and carry out transmission information according to certain standard.Concrete, according to one embodiment of the invention, this certain criterion that is used for selecting is maximum signal noise ratio principle, for the CSI-RS resource in measuring set, can at first be the first subband group in S subband of its trial selection, and corresponding signal to noise ratio is assessed; Then attempt the second subband group in S subband of selection, and its signal to noise ratio is assessed; The rest may be inferred, until the signal to noise ratio that all possible subband group in S subband is applied to a CSI-RS resource was all carried out assessment.Signal to noise ratio while then the different sub-band group being applied to a CSI-RS resource compares, and selects the subband group that wherein the has maximum signal to noise ratio preferred subband group as a CSI-RS resource according to maximum signal noise ratio principle.In the same way, can be other CSI-RS resource in measuring set, as the 2nd CSI-RS resource selection subband group.
According to one embodiment of the invention, network side can send the CSI-RS resource selection subband group in the top signaling equipment for indicating user still is chosen as respectively multipoint cooperative by uniting selection measuring set.
In step 102, subscriber equipment can feed back to network side with the identifier of selected subband group, and identifier comprises the positional information of at least one subband that comprises in selected subband group for network side.For uniting and selecting, owing to being the identical subband group of CSI-RS resource selection all in measuring set, thereby the identifier that only feeds back this same subband group gets final product.For selecting respectively, because the subband group that is each the CSI-RS resource selection in measuring set is not quite similar, thereby subscriber equipment can be fed back to the identifier of the selected subband group of each CSI-RS resource.Identifier comprises the positional information of at least one subband that comprises in selected subband group.
According to one embodiment of the invention, except feeding back the positional information of selected subband group, be identifier, subscriber equipment also feeds back each CSI-RS resource in measuring set on broadband and the channel condition informations such as the pre-coding matrix index of selected subband group and channel quality indication.
One embodiment of the invention also provide an information that is used for multipoint cooperative to feed back, as subscriber equipment 20.Fig. 2 is the structured flowchart of subscriber equipment 20 according to an embodiment of the invention.This subscriber equipment 20 comprises: subband group choice device 200, be the channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group, and this subband group comprises at least one subband; And identifier feedback device 201, the identifier of the selected subband group of feedback, this identifier comprises the positional information of at least one subband that comprises in selected subband group.
In other embodiments, subscriber equipment 20 also can comprise top signaling receiving system 202, receives top signaling.This top signaling is designated as channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group and unites and select or select respectively.In one embodiment, subscriber equipment 20 also can further comprise information feedback device 203, and feedback each CSI-RS resource in measuring set is on broadband and the channel condition informations such as the pre-coding matrix index on selected subband group and channel quality indication.
The structured flowchart of this subscriber equipment 20 only is used as example, is not the restriction fully to information feedback device of the present invention.For example, to those skilled in the art, identifier feedback device 201 can integrate fully with information feedback device 203.
The information feedback method of multipoint cooperative of the present invention and device, it has solved the problem of feeding back based on each CSI-RS resource in the multipoint cooperative measuring set.And be the identical or different subband group of CSI-RS resource selection in measuring set can support flexibly to adopt different multipoint cooperative scheme time the, and the identifier of the selected a plurality of or subband group of respective feedback.For example, for the multipoint cooperative scheme of combined dispatching, can avoid can't meeting for the different subband group of the CSI-RS resource selection in the multipoint cooperative measuring set by uniting selection the multipoint cooperative requirement of combined dispatching.
Consider the state of development of present 3GPP project, the feedback mechanism of multipoint cooperative of the present invention can directly be supplemented to the present mode in agreement 36.213, as the 2-2 pattern, and the 2-2 pattern after making it become expansion; Perhaps define new pattern in agreement 36.213, as the 2-4 pattern.Thereby the present invention also has good protocol compatibility.
In addition, due to the development of technology and the renewal of standard, the parts with identical function often have a plurality of different addresses.The technical term that uses in application for patent of the present invention is that Ying Yiqi is as the criterion in the function of knowing together in the art, and can not only with the similarities and differences of title, understand arbitrarily in order to explain and to demonstrate technical scheme of the present invention.
Technology contents of the present invention and technical characterstic disclose as above, yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and by present patent application claims, is contained.
Claims (12)
1. a method, feed back for the information of multipoint cooperative; The method comprises:
For the channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group, described subband group comprises at least one subband; And
Feed back the identifier of selected subband group, described identifier comprises the positional information of at least one subband described in selected subband group.
2. the method for claim 1, it further comprises the reception top signaling, and described top signaling indication is described unites and selects or select respectively for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative; The described associating select to refer to the same subband group of all CSI-RS resource selection in described measuring set, the described selection respectively refers to each the CSI-RS resource in described measuring set is selected respectively subband group.
3. method as claimed in claim 2, wherein when the multipoint cooperative scheme is joint transmission, described for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative be the associating selection.
4. method as claimed in claim 2, wherein when the multipoint cooperative scheme be cooperative scheduling/wave beam forming or dynamic point while selecting, described for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative be to unite to select or select respectively.
5. method as claimed in claim 2, it further comprises each CSI-RS resource in the described measuring set of feedback on broadband and the channel condition informations such as the pre-coding matrix index on selected subband group and channel quality indication.
6. the method for claim 1, it is periodically or acyclic feedback.
7. a subscriber equipment, feed back for the information of multipoint cooperative; This subscriber equipment comprises:
The subband group choice device, be the channel condition information in the measuring set of multipoint cooperative-reference signal CSI-RS resource selection subband group, and described subband group comprises at least one subband; And
The identifier feedback device, the identifier of the selected subband group of feedback, described identifier comprises the positional information of at least one subband described in selected subband group.
8. subscriber equipment as claimed in claim 7, it further comprises the top signaling receiving system, receives top signaling; Described top signaling indication is described unites and selects or select respectively for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative; The described associating select to refer to the same subband group of all CSI-RS resource selection in described measuring set, the described selection respectively refers to each the CSI-RS resource in described measuring set is selected respectively subband group.
9. subscriber equipment as claimed in claim 8, wherein when the multipoint cooperative scheme is joint transmission, described for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative be the associating selection.
10. subscriber equipment as claimed in claim 8, wherein when the multipoint cooperative scheme be cooperative scheduling/wave beam forming or dynamic point while selecting, described for the CSI-RS resource selection subband group in the measuring set of multipoint cooperative be to unite to select or select respectively.
11. subscriber equipment as claimed in claim 8, it further comprises the information feedback device, feeds back each CSI-RS resource in described measuring set on broadband and the pre-coding matrix index on selected subband group and the channel condition informations such as channel quality indication.
12. subscriber equipment as claimed in claim 7, it is periodicity or acyclic feedback.
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| WO2017157082A1 (en) * | 2016-03-18 | 2017-09-21 | 电信科学技术研究院 | Csi feedback method, precoding method, terminal and base station |
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