CN105827370A - Method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by PDSCH (Physical Downlink Shared Channel) - Google Patents
Method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by PDSCH (Physical Downlink Shared Channel) Download PDFInfo
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Abstract
The invention provides a method for sending CSI-RSs (Channel State Information-Reference Signals) during two-dimensional precoding carried out by a PDSCH (Physical Downlink Shared Channel). The method comprises the step that a base station sends CSI-RSs at the horizontal dimension and CSI-RSs at the vertical dimension to UE (User Equipment), wherein the CSI-RSs at the horizontal dimension are subjected to precoding in advance, and the precoding adopts a precoding matrix at the vertical dimension of the current PDSCH. The method provided by the invention can greatly improve precoding effects at the horizontal dimension of the PDSCH.
Description
Technical field
The present invention relates to LTE communication field, particularly relate to a kind of PDSCH and carry out the sending method of CSI-RS under two dimension precoding situation.
Background technology
Advanced long-term evolution system (Long-TermEvolutionadvance, it is called for short LTE-Advance) define two kinds of pilot tones, i.e. channel state information reference signals (ChannelStateInformation-ReferenceSignals, it is called for short CSI-RS) and demodulated reference signal (DemodulationReferenceSignals is called for short DMRS).Current LTE system uses one-dimensional antenna structure, and base station sends at CSI-RS port and is obtained with the channel condition information of horizontal dimensions according to channel estimation results after CSI-RS, UE receive CSI-RS and feeds back to base station.As Physical Shared Channel (PDSCH, when PhysicalDownlinkSharedChannel) carrying out the pre-encode operation of horizontal dimensions, the channel condition information of UE feedback includes that channel quality indicates (CQI, ChannelQualityIndication), channel sequence instruction (RI, RankIndication) and pre-coding matrix instruction (PMI, PrecodingMatrixIndication), the pre-coding matrix of the horizontal dimensions determining PDSCH is fed back in base station based on UE.
At third generation partner program (3rdGenerationPartnershipProject, it is called for short 3GPP) LTE65 meeting has been directed towards full dimension MIMO technique (Full-DimensionMIMO, it is called for short FD-MIMO) project verification, for studying the beam shaping supporting vertical with horizontal plane.Now base station uses the antenna system of bidimensional transmitter unit array structure, carries out Self Adaptive Control for simultaneously in vertically and horizontally dimension.Base station is after certain transmitter unit sends CSI-RS, the CSI-RS that UE receives will comprise horizontal extension angle information and the vertical dip angle information of this transmitter unit simultaneously, according to vertical dip angle information is identical but the channel estimation results of CSI-RS that horizontal extension angle information is different can obtain the channel condition information of horizontal dimensions, according to horizontal extension angle information is identical but the channel estimation results of CSI-RS that vertical dip angle information is different can obtain the channel condition information of vertical dimensions.The CSI-RS of the above-mentioned channel condition information for obtaining horizontal dimensions is referred to as the CSI-RS of horizontal dimensions, the CSI-RS of the above-mentioned channel condition information for obtaining vertical dimensions is referred to as the CSI-RS of vertical dimensions, then base station not only needs to send the CSI-RS of horizontal dimensions, in addition it is also necessary to send the CSI-RS of vertical dimensions.
For above-mentioned bidimensional aerial array situation, when PDSCH carries out both horizontally and vertically pre-encode operation simultaneously, if using the method similar with current one-dimensional antenna system, i.e. base station does not use any process to directly transmit the CSI-RS of horizontal dimensions and vertical dimensions, obtain horizontal dimensions and the channel condition information of vertical dimensions after UE reception according to channel estimation results respectively and feed back to base station, the channel condition information of the horizontal dimensions that base station is fed back according to UE determines the pre-coding matrix of the horizontal dimensions of PDSCH, the channel condition information of the vertical dimensions according to UE feedback determines the pre-coding matrix of the vertical dimensions of PDSCH.Then ignore the impact on horizontal dimensions precoding of the vertical dimensions precoding due to this method, the precoding effect of PDSCH horizontal dimensions will be substantially reduced.It is thus desirable to propose a kind of effective CSI-RS sending method, it is possible to fully take into account the impact on horizontal dimensions precoding of the vertical dimensions precoding.
In addition, existing LTE system CSI-RS maximum can support 8 antenna ports, under LTEFDD standard, when CSI-RS is 8 port, the RE position shared by each port is as shown in Figure 1, one has 5 set configurations, identical patterns represents and belongs to same set of configuration, and often the label 0～7 in set configuration represents this RE position residing for 8 port correspondences.It is to say, have allocated only 5 set resources at present for sending the CSI-RS of horizontal dimensions, often set resource comprises 8 RE, selects the most a set of resource time actually used.And for above-mentioned bidimensional aerial array situation, base station not only needs to send the CSI-RS of horizontal dimensions, in addition it is also necessary to send the CSI-RS of vertical dimensions, it is clear that configure RE resource prior art to the CSI-RS of vertical dimensions.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention proposes a kind of PDSCH and carries out the sending method of CSI-RS during two dimension precoding, and described method includes:
Base station sends the CSI-RS and the CSI-RS of vertical dimensions of horizontal dimensions to UE, and the CSI-RS of described horizontal dimensions is in advance through precoding, and described precoding uses the pre-coding matrix of the vertical dimensions of current PDSCH.
Preferably, said method farther includes:
The CSI-RS of the UE horizontal dimensions to receiving carries out channel estimation, channel estimation results according to horizontal dimensions obtains the channel condition information of horizontal dimensions and feeds back to base station, base station determines the pre-coding matrix of the horizontal dimensions of PDSCH according to the feedback of UE, can include CQI, RI and PMI etc.；
The CSI-RS of the UE vertical dimensions to receiving carries out channel estimation, obtains the channel condition information of vertical dimensions according to the channel estimation results of vertical dimensions and feeds back to base station, and base station determines the pre-coding matrix of the vertical dimensions of PDSCH according to the feedback of UE.
Preferably, in step b, the RE resource collection for the CSI-RS configuration of vertical dimensions is the most overlapping with the RE resource collection that the CSI-RS for horizontal dimensions configures.
Preferably, in step b, the RE resource collection for the CSI-RS configuration of vertical dimensions is included in as in the RE resource collection of the CSI-RS configuration of horizontal dimensions.
Preferably, in step b, the RE resource collection of CSI-RS configuration for vertical dimensions partly overlaps with the RE resource collection of the CSI-RS configuration for horizontal dimensions.
The present invention has carried out precoding to the CSI-RS of horizontal dimensions in advance, can fully take into account the impact on horizontal dimensions precoding of the vertical dimensions precoding, is greatly improved the precoding effect of PDSCH horizontal dimensions.The present invention has also carried out configuring to RE resource shared by the CSI-RS of vertical dimensions.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the RE resource distribution figure of the CSI-RS of current LTE system；
Fig. 2 is the method step flow chart that the embodiment of the present invention one sends CSI-RS；
Fig. 3 is the RE resource distribution figure of the CSI-RS of the embodiment of the present invention two vertical dimensions and horizontal dimensions；
Fig. 4 is the RE resource distribution figure of the CSI-RS of the embodiment of the present invention three vertical dimensions and horizontal dimensions；
Fig. 5 is the RE resource distribution figure of the CSI-RS of the embodiment of the present invention four vertical dimensions and horizontal dimensions.
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 accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, 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 the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one
This example demonstrates that PDSCH carry out two dimension precoding time CSI-RS sending method, step as in figure 2 it is shown, particularly as follows:
1, the CSI-RS of base station notice UE horizontal dimensions and the CSI-RS port numbers of vertical dimensions；
2, base station carries out precoding to the CSI-RS of horizontal dimensions, and the pre-coding matrix that the pre-coding matrix of employing uses in the vertical dimension. with current PDSCH channel is identical；
3, base station, in the RE resource that CSI-RS port numbers is corresponding, sends vertical dimensions and the CSI-RS of horizontal dimensions；
4, UE in the RE resource that CSI-RS port numbers is corresponding, receives vertical dimensions and the CSI-RS of horizontal dimensions；
5, UE by carrying out information estimation to the CSI-RS of vertical dimensions Yu horizontal dimensions, it is thus achieved that vertical dimensions and the channel condition information of horizontal dimensions；
6, UE according to the channel condition information of above-mentioned vertical dimensions, it is thus achieved that vertical direction optimum code word, the order of the present embodiment vertical dimensions is 1, so vertical dimensions only has an optimum code word；
7, UE is according to above-mentioned horizontal dimensions channel condition information, according to maximum throughput principle, or maximum S/N R principle, or minimum singular value principle etc., all precoding codebooks of traversal layer one to layer N, wherein N=min (sends out antenna number, receive antenna number), find the optimum code word in all layers；
8, the optimum code word indexing (i.e. PMI) of UE feedback level dimension and the number of plies (i.e. RI) at optimum code word place, and the optimum code word indexing (i.e. PMI) of vertical dimensions, UE goes back feedback level dimension and the CQI of vertical dimensions simultaneously, feeds back to base station by PUSCH/PUCCH；
9, after base station receives horizontal direction optimum code word indexing and the optimum code word place number of plies, horizontal precoding codebook correspondence based on PDCSH obtains the pre-coding matrix of the horizontal dimensions of PDCSH；
10, after base station receives vertical direction optimum code word indexing, vertical precoding codebook correspondence based on PDCSH obtains the pre-coding matrix of the vertical dimensions of PDCSH.
Embodiment two
In the step 3 of embodiment one, base station needs in the RE resource that CSI-RS port numbers is corresponding, send vertical dimensions and the CSI-RS of horizontal dimensions, in actual application, the RE resource distribution of the CSI-RS of vertical dimensions and horizontal dimensions can have kinds of schemes, and the present embodiment illustrates one of which allocation plan.Mapping to not affect the resource of the CSI-RS of the horizontal dimensions of existing LTE system configuration, the present embodiment is adopted as the CSI-RS of vertical dimensions and additionally configures the mode of new RE resource.Assume that one has 12 CSI-RS ports, wherein comprise the CSI-RS port (port numbers is designated as 0～7) of 8 horizontal dimensions, the CSI-RS port (port numbers is designated as 8～11) of 4 vertical dimensions, then the RE resource of these ports maps as shown in Figure 3, the CSI-RS port of horizontal dimensions still uses 5 set configurations of former LTE system, and the CSI-RS port of vertical dimensions uses the configuration that 2 sets are new, this 2 set resource is entirely different with the 5 of horizontal dimensions set resources, so the present embodiment needs altogether 48 RE resources.
Embodiment three
The present embodiment is with the difference of embodiment two: the present embodiment is adopted as the mode of the CSI-RS existing RE resource of configuration of vertical dimensions.The RE resource of 12 CSI-RS ports maps as shown in Figure 4, reduce the configuration tricks of the CSI-RS port of horizontal dimensions, the 4 set configurations only with former LTE system, 8 RE resources in residue 1 set configuration are divided into 2 sets, it is allocated to the CSI-RS port of vertical dimensions, owing to this 2 set resource of vertical dimensions is included in the former 5 set resources of horizontal dimensions, so the present embodiment is without increasing new RE resource.
Embodiment four
The present embodiment in conjunction with the embodiments two and thought of embodiment three: be adopted as the CSI-RS part of vertical dimensions and configure existing RE resource part simultaneously and configure the mode of new RE resource.The RE resource of 12 CSI-RS ports maps as shown in Figure 5, reduce the configuration tricks of the CSI-RS port of horizontal dimensions, the 4 set configurations only with former LTE system, 8 RE resources in residue 1 set configuration are divided into 2 sets, it is allocated to the CSI-RS port of vertical dimensions, the most also still further configuring, for vertical dimensions CSI-RS port, the RE resource that 2 sets are new, such vertical dimensions CSI-RS port one has 4 set resources, beneficially the flexible dispatching of base station.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can be completed by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, 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 CDs.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a PDSCH carries out the sending method of CSI-RS during two dimension precoding, it is characterised in that described method includes:
Base station sends the CSI-RS and the CSI-RS of vertical dimensions of horizontal dimensions to UE, and the CSI-RS of described horizontal dimensions is in advance through precoding, and described precoding uses the pre-coding matrix of the vertical dimensions of current PDSCH.
Method the most according to claim 1, it is characterised in that described method farther includes:
The CSI-RS of the UE horizontal dimensions to receiving carries out channel estimation, obtains the channel condition information of horizontal dimensions according to the channel estimation results of horizontal dimensions and feeds back to base station, and base station determines the pre-coding matrix of the horizontal dimensions of PDSCH according to the feedback of UE；
The CSI-RS of the UE vertical dimensions to receiving carries out channel estimation, obtains the channel condition information of vertical dimensions according to the channel estimation results of vertical dimensions and feeds back to base station, and base station determines the pre-coding matrix of the vertical dimensions of PDSCH according to the feedback of UE.
Method the most according to claim 2, it is characterised in that the channel condition information of described horizontal dimensions includes CQI, RI and PMI.
4. according to the method described in claims 1 to 3 any one, it is characterised in that step b: the RE resource collection for the CSI-RS configuration of vertical dimensions is the most overlapping with the RE resource collection that the CSI-RS for horizontal dimensions configures.
5. according to the method described in claims 1 to 3 any one, it is characterised in that step b: the RE resource collection for the CSI-RS configuration of vertical dimensions is included in as in the RE resource collection of the CSI-RS configuration of horizontal dimensions.
6. according to the method described in claims 1 to 3 any one, it is characterised in that step b: the RE resource collection of CSI-RS configuration for vertical dimensions partly overlaps with the RE resource collection of the CSI-RS configuration for horizontal dimensions.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103621000A (en) * | 2012-06-14 | 2014-03-05 | 华为技术有限公司 | Method, user equipment, and base station evolved node for determining precoding matrix indicator |
| CN103634085A (en) * | 2012-08-27 | 2014-03-12 | 电信科学技术研究院 | Methods, devices and system for PMI feedbacking and receiving |
| WO2014113992A1 (en) * | 2013-01-28 | 2014-07-31 | 富士通株式会社 | Feedback method for channel state information, transmission method for channel state information reference signal, user equipment and base station |
| CN104243106A (en) * | 2014-09-28 | 2014-12-24 | 重庆邮电大学 | Codebook construction method based of 3D (three dimensional) cross polarization channel based massive multiple input multiple output (MIMO) system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103621000A (en) * | 2012-06-14 | 2014-03-05 | 华为技术有限公司 | Method, user equipment, and base station evolved node for determining precoding matrix indicator |
| CN103634085A (en) * | 2012-08-27 | 2014-03-12 | 电信科学技术研究院 | Methods, devices and system for PMI feedbacking and receiving |
| WO2014113992A1 (en) * | 2013-01-28 | 2014-07-31 | 富士通株式会社 | Feedback method for channel state information, transmission method for channel state information reference signal, user equipment and base station |
| CN104243106A (en) * | 2014-09-28 | 2014-12-24 | 重庆邮电大学 | Codebook construction method based of 3D (three dimensional) cross polarization channel based massive multiple input multiple output (MIMO) system |
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