CN106712895A

CN106712895A - Method for feeding CSI and method and device for transmitting downlink data

Info

Publication number: CN106712895A
Application number: CN201510463459.XA
Authority: CN
Inventors: 陈文洪; 高秋彬; 陈润华; 拉盖施; 李辉
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2015-07-31
Filing date: 2015-07-31
Publication date: 2017-05-24
Anticipated expiration: 2035-07-31
Also published as: CN106712895B

Abstract

The present invention provides a method for feeding CSI and a method and device for transmitting downlink data. The method for feeding CSI by UE comprises a step of determining at least one CSI feedback configuration set of a base station configuration according to the indication of a base station, wherein each of the CSI feedback configuration sets comprises at least one CSI feedback configuration, a step of determining N CSI feedback configurations with the need of CSI feedback for any CSI feedback configuration set of the base station configuration, and determining a recommended CSI feedback configuration number K based on the determined N CSI feedback configurations and corresponding CSI, and a step of reporting the position information of the N CSI feedback configurations, the corresponding CSI and the CSI feedback configuration number K to the base station. According to the method for feeding CSI and the method and device for transmitting downlink data, the base station can obtain CSI corresponding to multiple downlink beams for flexible scheduling of downlink, at the same time a recommended downlink beam number measured and obtained from a UE side can be obtained to provide a reference for downlink scheduling.

Description

A kind of method and device of the method for feedback CSI and transmission downlink data

Technical field

The present invention relates to wireless communication technology field, more particularly to a kind of side of feeding back channel state information CSI The method and device of method and transmission downlink data.

Background technology

In existing cellular system, base-station antenna array typically in horizontally arranged, as depicted in figs. 1 and 2. Transmission end of base station wave beam is only capable of being adjusted in the horizontal direction, and is in vertical direction fixed angle of declination, Therefore various wave beam forming/precoding techniques etc. are all based on what horizontal direction channel information was carried out.In fact, It is in space three-dimensional propagation due to wireless signal, the method for fixed angle of declination can not reach the performance of system To optimal.For reducing inter-cell interference, improving systematic function has critically important for the wave beam adjustment of vertical direction Meaning.

With the development of antenna technology, industry has gone out the active day being now able to each antenna element independent control Line, as shown in Figure 3 a and Figure 3 b shows.Using this aerial array so that wave beam is adjusted in the dynamic of vertical direction It is whole to be possibly realized.

Under this three-dimensional antenna array, base station sends to UE (User Equipment, user equipment) Signal not only can in the horizontal direction carry out figuration, can also carry out figuration in vertical direction.In order that eNB (Evolved NodeB, evolution base station) determines that the figuration vector of vertical direction enables the wave beam of vertical direction UE is enough directed at, so as to obtain the figuration gain of maximum, it usually needs give UE configuration multiple CSI (Channel State Information, channel condition information) feedback configuration, different CSI feedback configurations are using different Vertical beam figuration vector, after UE carries out downstream signal measurement based on multiple CSI feedbacks configurations, will be optimal CSI and its corresponding CSI feedback configuration notification base station, so as to make the base station can when to UE sending signals Vertical figuration is carried out with using optimal vertical figuration vector.Here CSI generally comprises RI (Rank Indication, order instruction), PMI (Precoding Matrix Indicator, pre-coding matrix instruction), CQI (Channel Quality Indication, channel quality is indicated).

Specific steps are described below：

First, base station determines N number of NZP (non-zero power) CSI-RS (Channel State Information Reference Signal, channel condition information measuring reference signals) resource, the end of each CSI-RS Mouth number is identical with antenna element group number, and each port of each CSI-RS corresponds to one group of antenna Unit, such as a port correspondence first row vertical antenna, second port correspondence secondary series vertical antenna, By that analogy.Base station determines a beamforming weighting vector for each CSI-RS, and wave beam forming adds Weight vector can be determined by the CSI-RS vertical angle to be covered.It is every for the CSI-RS Individual port, its pilot signal is after wave beam forming vector weighting from the corresponding one group of antenna element in the port Send.

By taking Fig. 4 as an example, 16 antenna elements are had, 4 antenna elements in vertical direction are divided into one group, Every group of 4 antenna elements, have 4 groups.Each group of antenna element is used to send of CSI-RS The pilot signal of port.I-th pilot signal s of port_nI () uses beamforming weighting vector [w_n(0) w_n(1) w_n(2) w_n(3)]^TSent from i-th group of antenna, i.e. the i-th array antenna after weighting.In figure Subscript n is used to distinguish CSI-RS.If base station is configured with 3 CSI-RSs, each CSI-RS The beam direction of resource is different, then need to configure 3 groups of different beamforming weighting vectors [w_n(0) w_n(1) w_n(2) w_n(3)]^T, n=0,1,2.UE can be based on this three groups of CSI-RS difference Measure, report and the CSI for obtaining is measured in the best CSI-RS of wherein channel quality, and should Positional information of the CSI-RS in the CSI-RS of all configurations.Base station can believe according to the position Breath obtains current optimal vertical orming weighting vector, so as to carry out the vertical figuration of data.

In order to support CoMP in LTE (Long Term Evolution, Long Term Evolution) system, introduce The concept of CSI processes.Each CSI process can correspond to a NZP CSI-RSs configuration and one IMR (interference measurement resource, interferometry resource) is configured, and UE is based on configuration NZP CSI-RS carry out channel measurement, and interferometry is carried out with corresponding IMR, so as to obtain and anti- Present the corresponding CSI of each CSI process.

In existing feedback mechanism, if UE only feed back optimal CSI feedback configuration positional information and CSI is corresponded to, then base station side can only carry out downlink transfer based on UE feedacks.If base station is according to certainly The dispatch situation of body wishes to use that more vertical dimension wave beams for downlink transfer, then cannot obtain more CSI feedback configures corresponding CSI, therefore dispatching flexibility is poor..

The content of the invention

The present invention provides the method and dress of a kind of method of feeding back channel state information CSI and transmission downlink data Put, base station can both obtain the corresponding CSI of multiple downlink wave beams for descending flexible dispatching, while can also Know the downlink wave beam quantity for wherein recommending obtained from the measurement of UE sides so as to for descending scheduling provides ginseng Examine.

The present invention provides a kind of method of user equipment (UE) feeding back channel state information CSI, including：

Instruction according to base station determines at least one CSI feedback configuration group that base station configures, each CSI feedback Configuration group includes the configuration of at least one CSI feedback, the CSI feedback be configured for descending CSI measurement and The downstream signal configuration of feedback；

For any CSI feedback configuration group that base station configures, it is determined that N number of CSI of CSI feedback need to be carried out Feedback configuration, based on the described N number of CSI feedback configuration for determining and corresponding CSI, it is determined that the CSI for recommending Feedback configuration number K, N are not more than the CSI feedback configuration sum that the CSI feedback configuration group is included, and K is not for Positive integer more than N；

The positional information and its corresponding CSI of the described N number of CSI feedback configuration that will be determined, and the CSI Feedback configuration number K reports base station.

Preferably, the CSI feedback is configured to CSI processes, or for non-zero power channel condition information is referred to Signal NPZ CSI-RS are configured, or for interferometry resource IMR is configured.

Preferably, the value of N is determined using following either type：

According to the agreement with base station, the value of N is determined；

The high-level signaling sent by base station, determines the value of N；

The triggering command of the aperiodicity CSI feedback sent by base station, determines the value of N.

Preferably, determine N be 1 when, it is determined that need to carry out CSI feedback 1 CSI feedback configuration after, It is determined that the CSI feedback configuration number K for recommending base station to use is 1；

The positional information and its corresponding CSI that 1 CSI feedback of the determination is configured report base station, CSI feedback is not reported to configure number K；Or

The positional information and its corresponding CSI that 1 CSI feedback of the determination is configured report base station, Report CSI feedback to configure number K simultaneously and be fixed as 1.

Preferably, from each CSI feedback configuration group of base station configuration, it is determined that the N of CSI feedback need to be carried out Individual CSI feedback configuration, specifically includes：

Reference Signal Received Power RSRP surveys are carried out to each CSI feedback configuration in CSI feedback configuration group Amount, according to RSRP orders from high to low, selects the corresponding CSI feedback configuration conducts of N number of RSRP to need Carry out N number of CSI feedback configuration of CSI feedback；Or

Channel quality indicator (CQI) measurement is carried out to each CSI feedback configuration in CSI feedback configuration group, According to CQI orders from high to low, the corresponding CSI feedback configurations of N number of CQI are selected as CSI need to be carried out N number of CSI feedback configuration of feedback；Or

Channel condition information CSI measurements are carried out to each CSI feedback configuration in CSI feedback configuration group, and Corresponding transport block size TBsize is obtained according to CSI measurement results, according to TBsize from big to small suitable Sequence, selects N number of TBsize correspondences CSI feedback configuration as the N number of CSI feedback that need to carry out CSI feedback Configuration.

Preferably, when N is more than 1, also include：

Relative phase information between reporting N number of CSI feedback to configure to base station.

Preferably, the relative phase information between N number of CSI feedback configuration, specific bag are reported to base station Include：

Relative phase information between N number of CSI feedback configuration is reported into base as independent feedback quantity Stand；Or

By the relative phase information between N number of CSI feedback configuration and CSI feedback configuration number K Base station is reported after combined coding；Or

By the relative phase information between N number of CSI feedback configuration, with the configuration of N number of CSI feedback Base station is reported after positional information combined coding.

Preferably, the positional information by N number of CSI feedback configuration reports base station, specifically includes：

Index in N number of CSI feedback configuration CSI feedback configuration group where it is reported into base station； Or

One CSI feedback configuration group one position sequence of correspondence, each CSI in the CSI feedback configuration group N number of CSI feedback is being configured corresponding position by feedback configuration to a bit that should be in position sequence Put after the bit in sequence is set to the values different from other bits, by the corresponding position of feedback configuration group at place Sequence reports base station.

The configuration of described N number of CSI feedback and the correspondence CSI of determination are preferably based on, it is determined that the CSI for recommending Feedback configuration number K, specifically includes：

Based on the configuration of described N number of CSI feedback and correspondence CSI that determine, it is determined that making down channel capacity maximum Or the CSI feedback configuration number of descending transport block size TBsize maximums is the CSI feedback configuration number recommended K。

It is determined that all possible CSI feedback configuration number i no more than N；

For each CSI feedback configuration number i, it is assumed that base station is from the configuration of N number of CSI feedback, and selection i is individual Optimal CSI feedback configure corresponding CSI carry out during downlink data transmission corresponding down channel capacity or Descending transport block size TBsize；

It is determined that the CSI for obtaining the transport block size TBsize of maximum downstream channel capacity or maximum downstream is anti- Feedback configuration number i is the CSI feedback configuration number K for recommending.

Preferably, CSI feedback configuration number K is reported into base station, is specifically included：

CSI feedback configuration number K is reported into base station as independent feedback quantity；Or

On after CSI feedback configuration number K, with the positional information combined coding of N number of CSI feedback configuration Offer base station.

The present invention also provides a kind of method that downlink data is transmitted in base station, it is characterised in that including：

For user equipment (UE) configures at least one CSI back configuration group and is indicated to UE, Each CSI feedback configuration group is configured including at least one CSI feedback, and the CSI feedback is configured for down Row CSI is measured and the downstream signal of feedback is configured；

Receive N number of CSI feedback configuration in each CSI feedback configuration group for reporting of UE positional information and Its corresponding CSI, and UE recommends the CSI feedback configuration number K that base station uses；

Positional information and its corresponding CSI that the N number of CSI feedback reported according to UE is configured, and CSI are anti- Feedback configuration number K, determines the downlink data transmission number of plies and the downlink data to each transport layer carries out precoding, and Sent after carrying out link circuit self-adapting.

The present invention also provides a kind of user equipment (UE), including：

The present invention also provides a kind of user equipment (UE), it is characterised in that including：

Configuration determining unit, for determining that at least one CSI feedback that base station configures is matched somebody with somebody according to the instruction of base station Group is put, each CSI feedback configuration group is configured including at least one CSI feedback, the CSI feedback is configured to Measured for descending CSI and the downstream signal of feedback is configured；

Feedback determination unit, in any CSI feedback configuration group configured for base station, it is determined that CSI need to be carried out N number of CSI feedback configuration of feedback, based on the described N number of CSI feedback configuration for determining and corresponding CSI, It is determined that the CSI feedback configuration number K, N that recommend are not more than the CSI feedback configuration group, K is no more than N Positive integer；

Reporting unit, the positional information and its corresponding of the described N number of CSI feedback configuration for that will determine CSI, and CSI feedback configuration number K reports base station.

Preferably, the feedback determination unit determines the value of N using following either type：

According to the agreement with base station, the value of N is determined；

The high-level signaling sent by base station, determines the value of N；

Preferably, the feedback determination unit determine N be 1 when, it is determined that 1 of CSI feedback need to be carried out After CSI feedback configuration, it is determined that the CSI feedback configuration number K for recommending is 1；

Positional information and its corresponding CSI that the reporting unit configures 1 CSI feedback of the determination Base station is reported, does not report CSI feedback to configure number K；Or configure 1 CSI feedback of the determination Positional information and its corresponding CSI report base station, while report CSI feedback configure number K be fixed as 1.

Preferably, the feedback determines determining unit from each CSI feedback configuration group that base station configures, really Surely N number of CSI feedback configuration of CSI feedback need to be carried out, is specifically included：

Preferably, when feedback determination unit is more than 1 in N, the reporting unit is additionally operable to：

Preferably, the reporting unit reports the relative phase between N number of CSI feedback configuration to base station Information, specifically includes：

Preferably, the feedback determination unit is based on the N number of CSI feedback configuration for determining and corresponding CSI, It is determined that the CSI feedback configuration number K for recommending, specifically includes：

Based on the described N number of CSI feedback configuration for determining and corresponding CSI, it is determined that making down channel capacity most Big descending transport block size TBsize maximum CSI feedback configuration number is the CSI feedback configuration number recommended K。

Preferably, the feedback determination unit is based on the N number of CSI feedback configuration for determining and correspondence CSI, really The fixed CSI feedback configuration number K for recommending, specifically includes：

For each CSI feedback configuration number i, it is assumed that base station selects from N number of CSI feedback configuration I optimal CSI feedback configures corresponding CSI is used for corresponding down channel capacity during downlink data transmission Descending transport block size TBsize；

Preferably, CSI feedback configuration number K is reported base station by the reporting unit, is specifically included：

CSI feedback is configured into number K, is reported after the positional information combined coding configured with N number of CSI feedback Base station.

The present invention also provides a kind of base station, including：

Dispensing unit, for configuring the configuration of at least one CSI back for user equipment (UE) Group is simultaneously indicated to UE, and each CSI feedback configuration group is configured including at least one CSI feedback, the CSI Feedback configuration is the downstream signal configuration for measuring and feeding back for descending CSI；

Feedback information receiving unit, it is N number of in each CSI feedback configuration group that UE is reported for receiving The positional information and its corresponding CSI of CSI feedback configuration, and the CSI feedback configuration number K that UE recommends；

Transmission unit, the positional information and its corresponding of the N number of CSI feedback configuration for being reported according to UE CSI, and CSI feedback configuration number K, determine the downlink data transmission number of plies and to the downlink data of each transport layer Precoding is carried out, is sent after line link self adaptation of going forward side by side.

Using the present invention provide feeding back channel state information CSI method and transmission downlink data method and Device, with following technique effect：

Base station can both obtain the corresponding CSI of multiple downlink wave beams for descending flexible dispatching, while can also Know the downlink wave beam quantity for wherein recommending obtained from the measurement of UE sides so as to for descending scheduling provides ginseng Examine.

Brief description of the drawings

Fig. 1 is horizontally arranged dual polarized antenna schematic diagram in the prior art；

Fig. 2 is horizontally arranged array antenna schematic diagram in the prior art；

Fig. 3 a are the dual polarized antenna schematic diagram of horizontal and vertical two-dimensional arrangements in the prior art；

Fig. 3 b are the array antenna schematic diagram of horizontal and vertical two-dimensional arrangements in the prior art；

Fig. 4 is in the prior art using multiple CSI-RS antenna ports transmission CSI-RS schematic diagrames；

Fig. 5 is that UE provided in an embodiment of the present invention feeds back CSI method flow diagrams；

Fig. 6 is the method flow diagram that downlink data is transmitted in base station provided in an embodiment of the present invention；

Fig. 7 is UE structural representations provided in an embodiment of the present invention；

The UE structure charts that Fig. 8 is provided for another embodiment of the present invention；

Fig. 9 is architecture of base station schematic diagram provided in an embodiment of the present invention；

The base station structure diagram that Figure 10 is provided for another embodiment of the present invention.

Specific embodiment

The method and biography of the feeding back channel state information CSI for providing the present invention with reference to the accompanying drawings and examples The method and device of defeated downlink data is illustrated in greater detail.

The present invention provides a kind of method of user equipment (UE) feeding back channel state information CSI, as shown in figure 5, Including：

Step 501, the instruction according to base station determines at least one CSI feedback configuration group that base station configures, often Individual CSI feedback configuration group is configured including at least one CSI feedback, and the CSI feedback is configured for descending CSI is measured and the downstream signal of feedback is configured；

Base station can configure one or more CSI feedback configuration group, and each CSI feedback configuration group includes one Individual or multiple CSI feedback configurations.

Specifically, CSI feedback is configured to CSI processes, or it is non-zero power channel state information reference signals NPZ CSI-RS are configured, or for interferometry resource IMR is configured.Therefore, CSI feedback configuration group can be with Any combination comprising the configuration of above CSI feedback, such as, CSI feedback configuration group can include multiple NZP CSI-RS is configured and an IMR configuration.

One CSI processes at least one NZP CSI-RS of correspondence configuration and an interferometry resource IMR.

Certainly, a CSI feedback configuration can also be that other are used for the descending ginseng that descending CSI is measured and fed back Examine signal and/or descending measurement resource distribution.

One CSI feedback configuration includes at least one NZP CSI-RS configurations, it is preferable that different CSI are anti- The NZP CSI-RS configured in feedback configuration carry out wave beam forming using different figuration vectors.

When one CSI feedback configuration group includes that multiple CSI feedbacks are configured, the CSI feedback configuration group can be with Including the common relevant configuration informations of the multiple CSI.

Concrete example：

Citing 1, base station configures a CSI feedback configuration group, and the CSI feedback configuration group can be comprising multiple CSI processes or multiple NZP CSI-RS.One CSI feedback configuration group is except comprising multiple CSI feedbacks Configuration is outer, can also include multiple CSI feedbacks and configure common other configurations information.For example, can include Multiple NZP CSI-RS configurations, an and IMR of the common association of all NZP CSI-RS configurations is configured

Citing 2, base station can configure three CSI feedback configuration groups, and each CSI feedback configuration group includes four Individual NZP CSI-RS configurations, can also include the IMR configurations of their common associations.

Base station can send high-level signaling to UE, and the high-level signaling that UE sends according to base station determines base station At least one CSI feedback configuration group of configuration.

Step 502, for any CSI feedback configuration group that base station configures, it is determined that CSI feedback need to be carried out N number of CSI feedback configuration, based on the described N number of CSI feedback configuration for determining and corresponding CSI, it is determined that pushing away CSI feedback configuration the number K, N for recommending are not more than the CSI feedback configuration sum that the CSI feedback configuration group is included, K is the no more than positive integer of N；

UE can determine the value of N using following either type：

I, N be the fixed numbers that base station and terminal are appointed, such as N=2, therefore UE can according to base The agreement stood, determines the value of N；

Ii, N are the numerical value that base station is configured by high-level signaling, such as N is a value in { 1,2,3,4 }, Therefore, the high-level signaling that UE can be sent by base station, determines the value of N；

Iii, for aperiodic CSI feedback, N can also be that letter is triggered in base station by aperiodicity CSI feedback Make the value for indicating；Such as, trigger signaling to indicate N by the aperiodicity CSI feedback of 1 bit is 1 still 2, therefore the value of N can be determined by the triggering command of the aperiodicity CSI feedback of base station transmission, Determine the value of N.

The CSI feedback configuration number that UE recommends is K, represents the N number of CSI for recommending base station to be fed back using UE K CSI feedback best in feedback configuration configures corresponding CSI is used for downlink transfer.

Preferably, the positional information and corresponding CSI of N number of CSI feedback configuration are according to recommendation Priority reports base station, and what now UE reported K representatives is to recommend preceding K CSI feedback Configuration.Therefore, K best CSI feedback configures the preceding K CSI that corresponding CSI is UE feedbacks The corresponding CSI of feedback configuration.

Step 503, the positional information that N number of CSI feedback of the determination is configured and its corresponding CSI, And the CSI feedback configuration number K reports base station.

The method of the UE feedbacks CSI that the present invention is provided is preferably applied to frequency division multiple-input and multiple-output FDMIMO System.

In the embodiment of the present invention, UE except the positional information that reports the CSI feedback of certain amount N to configure and Outside CSI, while also reporting a CSI feedback configured number for recommending base station to use, base station can both obtain The corresponding CSI of multiple downlink wave beams is used for descending flexible dispatching, is measured while can also know from UE sides To the downlink wave beam quantity for wherein recommending so as to for descending scheduling provides reference.

The method of UE provided in an embodiment of the present invention feedback CSI is when being preferably applied to downlink transfer to descending letter Number use vertical dimension figuration, when actually realizing, or level dimension figuration, can also be horizontal vertical Two-dimentional figuration, it is enterprising in which antenna element as long as carrying out figuration to CSI-RS with certain shape-endowing weight value The figuration of row CSI-RS ports is not limited, and can use the method for the present invention.

Preferably, in step 501, UE can in the following way determine that the CSI feedback of base station configuration is matched somebody with somebody Put group：

1) index that the CSI feedback for including in each the CSI feedback configuration group according to base station transmission is configured, Determine the CSI feedback configuration group of base station configuration；

2) configuration parameter that all CSI feedbacks sent according to base station are configured, determines the CSI of base station configuration The configuration parameter of feedback configuration group, wherein each CSI feedback configuration includes the index of CSI feedback configuration and is somebody's turn to do The group index of the CSI feedback configuration group where CSI feedback configuration.

For the first situation, base station can be that UE configures feedback configuration group according to certain order, such as once The index of CSI feedback configuration in a CSI feedback configuration group is sent, so which UE can determine CSI feedback configuration belongs to same CSI feedback configuration group.

Preferably, in step 502, from each CSI feedback configuration group of base station configuration, it is determined that need to enter N number of CSI feedback configuration of row CSI feedback, specifically can be, but not limited to using following either type：

I, RSRP (Reference signal are carried out to each CSI feedback configuration in CSI feedback configuration group Received power, Reference Signal Received Power) measurement, according to RSRP orders from high to low, selection The corresponding CSI feedback configuration of N number of RSRP is configured as the N number of CSI feedback that need to carry out CSI feedback；

Ii, channel quality indicator (CQI) measurement is carried out to each CSI feedback configuration in CSI feedback configuration group, According to CQI orders from high to low, the corresponding CSI feedback configurations of N number of CQI are selected as CSI need to be carried out N number of CSI feedback configuration of feedback.

Iii, channel condition information CSI measurements are carried out to each CSI feedback configuration in CSI feedback configuration group, And corresponding transport block size TBsize obtained according to CSI measurement results, according to TBsize from big to small Sequentially, select N number of TBsize correspondences CSI feedback configuration anti-as the N number of CSI that need to carry out CSI feedback Feedback configuration.

Preferably, in step 502, based on the N number of CSI feedback configuration for determining and corresponding CSI, really Surely recommend the CSI feedback configuration number K that base station uses, can be, but not limited in the following way：

Based on the configuration of N number of CSI feedback and correspondence CSI that determine, it is determined that make down channel capacity maximum or under Capable transport block size TBsize maximum CSI feedback configuration number is the CSI feedback configuration number K for recommending.

For first way, specifically may comprise steps of：

For each CSI feedback configuration number i, it is assumed that base station is from the configuration of N number of CSI feedback, and selection i is individual Optimal CSI feedback configures corresponding CSI is used for corresponding down channel capacity during downlink data transmission, tool Correspondence when body can configure corresponding CSI for downlink data transmission according to i optimal CSI feedback of selection Each transport layer SINR, determines down channel capacity；

It is determined that the CSI feedback configuration number i for obtaining maximum downstream channel capacity is that the CSI for recommending base station to use is anti- Feedback configuration number K.

Assuming that N=2, then UE needs to assume that base station configures corresponding using 1 and 2 CSI feedbacks respectively Descending each layer SINR that CSI is obtained for downlink transfer, and calculate each layer channel capacity in the case of two kinds Summation, so that it is determined that the maximum CSI feedback configuration number of total down channel capacity.

For the second way, specifically may comprise steps of：

For each CSI feedback configuration number i, it is assumed that base station is from the configuration of N number of CSI feedback, and selection i is individual Optimal CSI feedback configures corresponding CSI and carries out corresponding descending transport block size during downlink data transmission TBsize, specifically can obtain descending transport block size according to the transport block size of each transport layer；

It is determined that the CSI feedback configuration number i for obtaining maximum transport block size TBsize recommends base station to use CSI feedback configuration number K.

For the frequency division multiplexing Multiinputoutput FDMIMO of wave beam forming Beamformed CSI-RS modes Transmission, if the transmission number of plies of UE is more than 1, base station side can use one or more ripple in vertical dimension Beam is used for the transmission of different pieces of information layer.Now, UE needs the relevant information and CSI of the multiple wave beams of feedback, For the descending scheduling of base station side.Due to the descending of each wave beam cannot be known in base station side in the prior art Situation is interfered between SINR and different pieces of information layer, therefore, it is difficult to the multiple wave beams fed back from UE In information and CSI, it is determined that optimal vertical dimension number of beams.The method that the present invention is given, UE is according to root Down channel capacity is obtained according to each transport layer SINR, feedback obtains corresponding CSI during maximum downstream channel capacity Feedback configuration number K, can be used for assistant base station side and determines accurate vertical dimension number of beams for descending biography It is defeated.

Preferably, in step 503, UE is triggered by periodicity reporting schemes, or using aperiodicity Mode, the positional information that N number of CSI feedback of the determination is configured and its corresponding CSI, and it is described CSI feedback configuration number K reports base station.

Preferably, in step 503, CSI feedback configuration number K is reported into base station, can be, but not limited to adopt Use following either type：

1) CSI feedback configuration number K is reported into base station as independent feedback quantity；

2) by CSI feedback configure number K, with N number of CSI feedback configure positional information combined coding after on Offer base station.

Preferably, CSI feedback is configured into number K, the positional information combined coding configured with N number of CSI feedback, Specifically include：

CSI feedback is configured into number K, is matched somebody with somebody with a CSI feedback in N number of CSI feedback configuration of agreement The positional information combined coding put；Or

CSI feedback is configured into number K, what the CSI feedback of each in being configured with N number of CSI feedback was configured Positional information distinguishes combined coding.

Preferably, in step 502 determine N be 1 when, determine N be 1 when, it is determined that it is anti-to carry out CSI After 1 CSI feedback configuration of feedback, it is determined that the CSI feedback configuration number K for recommending base station to use is 1；Then In step 503, the positional information for 1 CSI feedback of the determination being configured and its corresponding CSI Base station is reported, while reporting CSI feedback to configure number K is fixed as 1, it is of course also possible to not report CSI Feedback configuration number K.

Preferably, in step 503, the positional information of the N number of CSI feedback configuration that will be determined reports base station, Can be, but not limited to using following either type：

I, by the index in N number of CSI feedback configuration CSI feedback configuration group where it of the determination Offer base station；For example, CSI feedback configuration group includes K CSI feedback configuration, then a CSI feedback is matched somebody with somebody The positional information put needs log2K bits, directly indicates the index of the CSI feedback configuration of UE selections.

Ii, by the way of bitmap, i.e., one CSI feedback configuration group one position sequence of correspondence, the CSI Each CSI feedback configuration in feedback configuration group to should be in position sequence a bit, will be described true After the bit that fixed N number of CSI feedback is configured in corresponding position sequence is set to the values different from other bits, The corresponding position sequence of feedback configuration group at place is reported into base station.

For bitmap modes, if a CSI feedback configuration is selected by UE, corresponding position bit 1 is set to, is otherwise 0.For example, CSI feedback configuration group includes K CSI feedback configuration, then length is needed The position sequence for K is spent, i-th bit is the corresponding position of i-th CSI feedback configuration in group in sequence Information, illustrates that the configuration is selected by UE if the bit is 1.

Preferably, when determining that N is more than 1 in step 502, also include：

Wherein, the step and step 503 can be performed simultaneously, i.e., report these information simultaneously, it is also possible to point Execution is opened, that is, is reported when separating different.

UE can be, but not limited to determine the relative phase letter between N number of CSI feedback configuration in the following way Breath：

Relative phase information is to carry out selection from a phase code book appointed by UE, and UE can be with Relative phase information is selected according to principles such as maximum channel capacities.Specifically, UE is by phase code book Each code word calculates each code word correspondence as the relative phase weighted information between the configuration of N number of CSI feedback Descending overall channel capacity；Determine the corresponding code word of maximum downstream overall channel capacity, be that N number of CSI feedback is matched somebody with somebody Relative phase information between putting.Such as, phase code book can be { 1exp (j*k*pi/2) }, k=0,1,2,3, The relative phase information of UE feedbacks is the index of the code word of selection.

UE can be, but not limited to using following either type, report N number of CSI feedback to configure to base station Between relative phase information：

I, the relative phase information between N number of CSI feedback is configured reports base as independent feedback quantity Stand；

Ii, the relative phase information between N number of CSI feedback is configured joins with CSI feedback configuration number K Base station is reported after compiling in collaboration with code；

Iii, the relative phase information between N number of CSI feedback is configured, with the configuration of N number of CSI feedback Base station is reported after positional information combined coding.

For the third coded system, can be by N number of CSI feedback configure between relative phase information, The positional information combined coding configured with the CSI feedback arranged in the configuration of N number of CSI feedback；Or, By each in the relative phase information between the configuration of N number of CSI feedback, with the configuration of N number of CSI feedback The positional information of CSI feedback configuration distinguishes combined coding (can be transmitted several times).

In network side, the embodiment of the present invention also provides a kind of method that downlink data is transmitted in base station, such as Fig. 6 institutes Show, including：

Step 601, is that user equipment (UE) configures at least one CSI back configuration group simultaneously UE is indicated to, each CSI feedback configuration group is configured including at least one CSI feedback, the CSI feedback It is configured for descending CSI measurements and the downstream signal configuration of feedback；

Base station can configure a CSI feedback configuration group when downlink data is transmitted for each carrier wave, also may be used Think all carrier wave configuration one CSI feedback configuration groups of identical.

Base station can send high-level signaling by UE, will configure the configuration of at least one CSI feedback for UE Group is indicated to UE.

Step 602, receives what the N number of CSI feedback in each CSI feedback configuration group that UE is reported was configured Positional information and its corresponding CSI, and UE recommend the CSI feedback configuration number K that base station uses；

Step 603, positional information and its corresponding CSI that the N number of CSI feedback reported according to UE is configured, And CSI feedback configuration number K, determine the downlink data transmission number of plies and the downlink data to each transport layer carry out it is pre- Coding, sends after line link self adaptation of going forward side by side.

The corresponding CSI of multiple downlink wave beams can have both been obtained using the method base station for descending flexible tune Degree, while the downlink wave beam quantity for wherein recommending obtained from the measurement of UE sides can also be known so as to under Row scheduling provides reference.

The CSI feedback configuration number of feedback makes downlink capacity maximization or transmission block maximized for K can be represented Number of beams, therefore base station may be referred to the CSI feedback configured number of the recommendation and knows and make downlink capacity maximum The number of beams of change, so that the CSI of each wave beam fed back based on the number of beams and UE carries out downlink transfer； Because the number of beams of UE feedbacks CSI is more than or equal to the number of beams that UE recommends, therefore base station can be with root Downlink data transmission is carried out according to dispatch situation selection more suitably wave number quantity.

Preferably, in step 601, UE will be indicated to for UE configures at least one CSI feedback configuration group, Specifically include：

The index of CSI feedback configuration is sent to UE in each the CSI feedback configuration group that will be configured for UE；

Or, send the configuration parameter that all CSI feedbacks are configured, wherein each CSI feedback configuration to UE Configuration parameter include CSI feedback configuration index and the CSI feedback configuration where CSI feedback configuration group Group index.

Preferably, CSI includes order instruction RI, and in step 603, base station can be, but not limited to using such as lower section Method determines the downlink data transmission number of plies：

The N number of CSI feedback reported according to UE configures corresponding CSI, according to CSI from good to bad order, K CSI feedback configuration of selection from the configuration of N number of CSI feedback；

Determine that the downlink data transmission number of plies isRI_iFor in the K CSI feedback configuration of selection RI in the corresponding CSI of i-th CSI feedback configuration.

Preferably, CSI includes order channel quality indicator (CQI) and pre-coding matrix instruction PMI, step 603 In, base station carries out precoding to the downlink data of each transport layer, is sent after line link self adaptation of going forward side by side, specifically Including：

Determine that the CSI feedback that each transport layer is used is configured；

For each transport layer, the CSI feedback used using the transport layer configures corresponding figuration vector sum The pre-coding matrix that pre-coding matrix instruction PMI is indicated in CSI carries out precoding to downlink data, using this The CQI that the CSI feedback that transmission is used is configured in corresponding CSI sends after carrying out link circuit self-adapting.

Preferably, base station is when it is determined that the CSI feedback that uses of each transport layer is configured, from the N number of of UE feedbacks Chosen in K CSI feedback configuration best in CSI feedback configuration.For using vertical waveform figuration vector The situation of downlink transfer, the CSI feedback configured number K that base station may be referred to the recommendation determines that vertical dimension is used Number of beams.

Situation about being combined from network side and UE below, provides the feeding back channel state information CSI of present invention offer Method and transmission downlink data method specific embodiment.

Embodiment

1) base station configures a CSI process by high-level signaling to UE, and four CSI-RS are included in CSI processes Resource distribution and an IMR configuration.Wherein, four CSI-RSs using different vertical dimension figurations to Amount carries out figuration.Meanwhile, base station needs to feed back the optimal CSI-RS of two of which by high level instruction UE The corresponding positional information of resource distribution and CSI.

2) four CSI-RSs that UE is based in the CSI processes carry out RSRP measurements respectively, obtain The corresponding RSRP of each CSI-RS, therefrom selects RSRP two CSI-RS conducts of highest Optimal CSI-RS configuration.

3) UE is based on optimal two CSI-RSs configuration and carries out CSI measurements, obtains each self-corresponding RI/PMI/CQI。

4) UE feeds back two optimal CSI-RSs and configures at described four respectively by PUCCH Index (each configuration so being fed back using 2 bits) in CSI-RS configuration, and it is described Two each self-corresponding RI/PMI/CQI of configuration.

5) while, the CSI-RS configuration number of the UE also recommendations of additional feedback 1, using 1 bit 1 and 2 two value is corresponded to respectively.Wherein 1 represents recommendation using a CSI-RS optimal in two configurations The corresponding CSI of resource distribution, 2 represent the corresponding CSI of two CSI-RSs recommended using feedback.For The recommendation is obtained, UE needs to calculate corresponding using optimal CSI-RS configuration respectively Two CSI-RSs of CSI and use configure corresponding CSI is used for the respective channel capacity of downlink transfer, Using the larger corresponding CSI-RS configuration number of channel capacity.CSI-RS configuration number with it is anti- The information of index 3 bits of composition of first CSI-RS configuration of feedback, feeds back to base station together.

6) index and CSI of two CSI-RSs configuration that base station is reported based on UE, and recommend CSI-RS configures number, determines the number of plies and precoding information of downlink data transmission, and line link of going forward side by side is certainly Adapt to.Assuming that the CSI-RS configuration number that UE is reported is 2, then base station determines that the descending transmission number of plies is Two CSI-RSs configure the sum of corresponding RI, and each CSI-RS configures corresponding transport layer The pre-coding matrix obtained using the vertical figuration vector and the corresponding PMI of the configuration of the configuration is carried out down Capable precoding.

Can be known by embodiment of the present invention base station makes the maximized vertical dimension number of beams of downlink capacity, from And the CSI for being based on each wave beam of the number of beams and UE feedbacks carries out downlink transfer.

Because the number of beams of UE feedbacks CSI is more than or equal to the number of beams that UE recommends, therefore base station can According to dispatch situation selection more suitably vertical dimension wave number quantity, certainly, not necessarily to be recommended using UE sides Number of beams.

A kind of feeding back channel state information CSI is additionally provided based on same inventive concept, in the embodiment of the present invention Method and transmission downlink data device, due to principle and a kind of feedback channel shape of the device solve problem The method of state information CSI with transmission downlink data method it is similar, therefore the device the implementation side of may refer to The implementation of method, repeats part and repeats no more.

The embodiment of the present invention provides a kind of user equipment (UE), as shown in fig. 7, comprises：

Configuration determining unit 701, for determining that at least one CSI that base station configures is anti-according to the instruction of base station Feedback configuration group, each CSI feedback configuration group is configured including at least one CSI feedback, and the CSI feedback is matched somebody with somebody It is set to the downstream signal configuration for being measured for descending CSI and being fed back；

Feedback determination unit 702, in any CSI feedback configuration group configured for base station, it is determined that need to carry out N number of CSI feedback configuration of CSI feedback, is configured and corresponding based on the described N number of CSI feedback for determining CSI, it is determined that the CSI feedback configuration number K, N that recommend are not more than the CSI feedback configuration group, K is little In the positive integer of N；

Reporting unit 703, the positional information and its correspondence of the described N number of CSI feedback configuration for that will determine CSI, and the CSI feedback configuration number K report base station.

According to the agreement with base station, the value of N is determined；

The high-level signaling sent by base station, determines the value of N；

The embodiment of the present invention also provides a kind of user equipment (UE), as shown in figure 8, including processor 800, Transceiver 810 and memory 820, wherein：

Processor 800, for reading the program in memory 820, performs following process：According to base station Indicate to determine at least one CSI feedback configuration group that base station configures, each CSI feedback configuration group is included at least One CSI feedback configuration, the CSI feedback is configured for the downstream signal of descending CSI measurements and feedback Configuration；For any CSI feedback configuration group that base station configures, it is determined that N number of CSI of CSI feedback need to be carried out Feedback configuration, based on the described N number of CSI feedback configuration for determining and corresponding CSI, it is determined that the CSI for recommending Feedback configuration number K, N are not more than the CSI feedback configuration sum that the CSI feedback configuration group is included, and K is not for Positional information and its corresponding CSI that positive integer more than N configures N number of CSI feedback of the determination, And the CSI feedback configuration number K, base station is reported by transceiver 810；

Transceiver 810, for being received under the control of processor 800 and sending data.

Wherein, in fig. 8, bus architecture can include any number of interconnection bus and bridge, specifically by The various electrical chains of the memory that the one or more processors and memory 820 that processor 800 is represented are represented It is connected together.Bus architecture can also be by such as ancillary equipment, voltage-stablizer and management circuit or the like Various other circuits are linked together, and these are all it is known in the art, therefore, no longer entering to it herein Row is further described.EBI provides interface.Transceiver 810 can be multiple element, i.e., including sending Machine and receiver, there is provided for the unit for being communicated with various other devices over a transmission medium.For different User equipment, user interface 830 can also be can it is external in connect the interface for needing equipment, the equipment of connection Including but not limited to keypad, display, loudspeaker, microphone, control stick etc..

Processor 800 is responsible for bus architecture and common treatment, and memory 820 can store processor 600 data used when operation is performed.

The embodiment of the present invention also provides a kind of base station, as shown in figure 9, including：

Dispensing unit 901, for configuring at least one CSI back for user equipment (UE) Configuration group is simultaneously indicated to UE, and each CSI feedback configuration group is configured including at least one CSI feedback, described CSI feedback is configured for descending CSI measurements and the downstream signal configuration of feedback；

Feedback information receiving unit 902, for receiving the N in each CSI feedback configuration group that UE is reported The positional information and its corresponding CSI of individual CSI feedback configuration, and UE recommend the CSI feedback that base station uses Configuration number K；

Transmission unit 903, the positional information and its right of the N number of CSI feedback configuration for being reported according to UE The CSI for answering, and CSI feedback configuration number K, determine the downlink data transmission number of plies and to the descending of each transport layer Data carry out precoding, are sent after line link self adaptation of going forward side by side.

Preferably, dispensing unit 901 will be indicated to UE for UE configures at least one CSI feedback configuration group, Specifically include：

Preferably, CSI includes order instruction RI, and transmission unit 903 can be, but not limited to adopt true with the following method Determine the downlink data transmission number of plies：

Preferably, CSI includes order channel quality indicator (CQI) and pre-coding matrix instruction PMI, transmission unit 903 pairs of downlink datas of each transport layer carry out precoding, are sent after line link self adaptation of going forward side by side, and specifically include：

The embodiment of the present invention also provides a kind of base station, as shown in Figure 10, including processor 100, transceiver 110 and memory 120, wherein：

Processor 100, for reading the program in memory 120, performs following process：

For user equipment (UE) configures at least one CSI back configuration group, and by transmitting-receiving Machine 110 is indicated to UE, and each CSI feedback configuration group is configured including at least one CSI feedback, the CSI Feedback configuration is the downstream signal configuration for measuring and feeding back for descending CSI；

The N number of CSI feedback received by transceiver 110 in each CSI feedback configuration group that UE is reported is matched somebody with somebody The positional information put and its corresponding CSI, and UE recommend the CSI feedback configuration number K that base station uses；

Positional information and its corresponding CSI that the N number of CSI feedback reported according to UE is configured, and CSI are anti- Feedback configuration number K, determines the downlink data transmission number of plies and the downlink data to each transport layer carries out precoding, and Sent by transceiver 110 after carrying out link circuit self-adapting；

Transceiver 110, for being received under the control of processor 100 and sending data.

Wherein, in Fig. 10, bus architecture can include the bus and bridge of any number of interconnection, specifically The various circuits of the memory that the one or more processors and memory 120 represented by processor 100 are represented Link together.Bus architecture can also be by such as ancillary equipment, voltage-stablizer and management circuit or the like Various other circuits link together, these are all it is known in the art, therefore, herein no longer to it It is described further.EBI provides interface.Transceiver 110 can be multiple element, i.e., including hair Send machine and transceiver, there is provided for the unit for being communicated with various other devices over a transmission medium.Processor 500 Bus architecture and common treatment are responsible for, memory 120 can store processor 100 and perform operation When the data that are used.

The present invention is produced with reference to method according to embodiments of the present invention, equipment (system) and computer program The flow chart and/or block diagram of product is described.It should be understood that can by computer program instructions realize flow chart and / or block diagram in each flow and/or the flow in square frame and flow chart and/or block diagram and/ Or the combination of square frame.These computer program instructions to all-purpose computer, special-purpose computer, insertion can be provided The processor of formula processor or other programmable data processing devices is producing a machine so that by calculating The instruction of the computing device of machine or other programmable data processing devices is produced for realizing in flow chart one The device of the function of being specified in individual flow or multiple one square frame of flow and/or block diagram or multiple square frames.

These computer program instructions may be alternatively stored in can guide computer or the treatment of other programmable datas to set In the standby computer-readable memory for working in a specific way so that storage is in the computer-readable memory Instruction produce include the manufacture of command device, the command device realization in one flow of flow chart or multiple The function of being specified in one square frame of flow and/or block diagram or multiple square frames.

These computer program instructions can be also loaded into computer or other programmable data processing devices, made Obtain and series of operation steps is performed on computer or other programmable devices to produce computer implemented place Reason, so as to the instruction performed on computer or other programmable devices is provided for realizing in flow chart one The step of function of being specified in flow or multiple one square frame of flow and/or block diagram or multiple square frames.

, but those skilled in the art once know base although preferred embodiments of the present invention have been described This creative concept, then can make other change and modification to these embodiments.So, appended right will Ask and be intended to be construed to include preferred embodiment and fall into having altered and changing for the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification without deviating from this hair to the present invention Bright spirit and scope.So, if it is of the invention these modification and modification belong to the claims in the present invention and Within the scope of its equivalent technologies, then the present invention is also intended to comprising these changes and modification.

Claims

1. a kind of method of user equipment (UE) feeding back channel state information CSI, it is characterised in that including：

2. the method for claim 1, it is characterised in that

The CSI feedback is configured to CSI processes, or is non-zero power channel state information reference signals NPZ CSI-RS is configured, or for interferometry resource IMR is configured.

3. the method for claim 1, it is characterised in that determine N's using following either type Value：

According to the agreement with base station, the value of N is determined；

The high-level signaling sent by base station, determines the value of N；

4. the method as described in claim 1 or 3, it is characterised in that

Determine N be 1 when, it is determined that need to carry out CSI feedback 1 CSI feedback configuration after, it is determined that pushing away The CSI feedback configuration number K for recommending is 1；

The positional information and its corresponding CSI that 1 CSI feedback of the determination is configured report base station, CSI feedback is not reported to configure number K；Or the positional information that configures 1 CSI feedback of the determination and Its corresponding CSI reports base station, while reporting CSI feedback to configure number K is fixed as 1.

5. the method as described in claim 1 or 3, it is characterised in that from each CSI of base station configuration In feedback configuration group, it is determined that N number of CSI feedback configuration of CSI feedback need to be carried out, specifically include：

6. the method as described in claim 1 or 3, it is characterised in that when N is more than 1, also include：

7. method as claimed in claim 6, it is characterised in that report N number of CSI anti-to base station Relative phase information between feedback configuration, specifically includes：

8. the method as described in claim 1 or 3, it is characterised in that match somebody with somebody N number of CSI feedback The positional information put reports base station, specifically includes：

9. the method as described in claim 1 or 3, it is characterised in that based on the described N number of CSI for determining Feedback configuration and correspondence CSI, it is determined that the CSI feedback configuration number K for recommending, specifically includes：

10. method as claimed in claim 9, it is characterised in that based on the described N number of CSI for determining Feedback configuration and correspondence CSI, it is determined that the CSI feedback configuration number K for recommending, specifically includes：

11. the method for claim 1, it is characterised in that report CSI feedback configuration number K Base station, specifically includes：

The method that downlink data is transmitted in a kind of 12. base stations, it is characterised in that including：

Receive N number of CSI feedback configuration in each CSI feedback configuration group for reporting of UE positional information and Its corresponding CSI, and the CSI feedback configuration number K that UE recommends；

13. methods as claimed in claim 12, it is characterised in that

A kind of 14. user equipment (UE)s, it is characterised in that including：

15. UE as claimed in claim 14, it is characterised in that

16. UE as claimed in claim 14, it is characterised in that the feedback determination unit is using as follows Either type determines the value of N：

According to the agreement with base station, the value of N is determined；

The high-level signaling sent by base station, determines the value of N；

17. UE as described in claim 14 or 16, it is characterised in that

The feedback determination unit determine N be 1 when, it is determined that 1 CSI feedback of CSI feedback need to be carried out After configuration, it is determined that the CSI feedback configuration number K for recommending is 1；

18. UE as described in claim 14 or 16, it is characterised in that the feedback determines single In each CSI feedback configuration group that unit configures from base station, it is determined that the N number of CSI that need to carry out CSI feedback is anti- Feedback configuration, specifically includes：

19. UE as claimed in claim 14, it is characterised in that be more than 1 in N in feedback determination unit When, the reporting unit is additionally operable to：

20. UE as claimed in claim 19, it is characterised in that the reporting unit reports institute to base station The relative phase information between N number of CSI feedback configuration is stated, is specifically included：

21. UE as claimed in claim 14, it is characterised in that the feedback determination unit is based on determining N number of CSI feedback configuration and corresponding CSI, it is determined that recommend CSI feedback configuration number K, specifically include：

22. UE as claimed in claim 21, it is characterised in that the feedback determination unit is based on what is determined N number of CSI feedback configuration and correspondence CSI, it is determined that the CSI feedback configuration number K for recommending, specifically includes：

23. UE as claimed in claim 14, it is characterised in that the reporting unit matches somebody with somebody CSI feedback Put several K and report base station, specifically include：

A kind of 24. base stations, it is characterised in that including：

25. base stations as claimed in claim 24, it is characterised in that