CN102932114A - Uplink precoding emitting method and device - Google Patents
Uplink precoding emitting method and device Download PDFInfo
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- CN102932114A CN102932114A CN2011102309162A CN201110230916A CN102932114A CN 102932114 A CN102932114 A CN 102932114A CN 2011102309162 A CN2011102309162 A CN 2011102309162A CN 201110230916 A CN201110230916 A CN 201110230916A CN 102932114 A CN102932114 A CN 102932114A
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Abstract
The invention discloses an uplink precoding emitting method and device. When a base station judges that UE (User Equipment) is allowed to automatically up precode, and informs the UE of carrying out uplink precoding emission by adopting an automatic uplink precoding mode. By adopting the invention, the UE can automatically carry out uplink precoding emission, the problem that a codebook selected by an eNode B can not be matched with a channel when uplink sending is carried by adopting a precoding matrix sent by an eNode B simply in the traditional uplink is overcome, therefore, the channel can be well matched, the emission property of an uplink is improved, and system packet error rate is lowered; and if a non-codebook precoding method is adopted, quantization errors of the codebook can be further overcome, the channel is accurately matched, and the property of the uplink is improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of up precoding launching technique and device.
Background technology
MIMO (Multiple Input Multiple Output, multiple-input and multiple-output) precoding technique is divided into based on the precoding of code book and the precoding of non-code book.
Precoding technique based on code book refers to, all knows in advance identical quantification code book at transmitting terminal with receiving terminal, and system selects suitable pre-coding matrix to carry out precoding to sending the user from this code book according to certain criterion.Advantage based on the precoding technique of code book is that feedback information volume is little, and shortcoming is that codebook element is limited, and has quantization error.
The precoding technique of non-code book refers to, transmitting terminal or receiving terminal calculate pre-coding matrix in real time according to all or part of channel condition information (Channel State Information is referred to as CSI), carries out precoding to sending data.Its shortcoming is that feedback information volume is larger, and advantage is better match channels, improves link performance.Adopted simultaneously based on the precoding mode of code book and the precoding mode of non-code book in LTE (Long Term Evolution, the Long Term Evolution) system.Wherein the precoding technique of non-code book is mainly used in TDD (Time Division Duplex, the time division duplex) system.
The LTE tdd mode adopts TDD mode, and the uplink and downlink channel occupies identical frequency resource, has natural channel reciprocity, is very suitable for adopting the precoding technique of non-code book to improve down-link performance.The basic operation process of LTE TDD system descending non-codebook precoding is: at first, detection reference signal (Sounding Reference Signal according to the up link transmission, referred to as SRS) or demodulated reference signal (Demodulation Reference signal, referred to as DMRS) estimate to obtain up channel, according to channel reciprocity, also just be equivalent to and obtain down channel.Secondly, carry out descending transmission pre-coding matrix according to down channel of equal value and estimate, usually use the pre-coding matrix method of estimation based on EBB (Eigen Based Beamforming, characteristic vector figuration algorithm).At last, when descending transmission, the pre-coding matrix that adopts estimation to obtain carries out identical precoding to sending data and UE (User Equipment, subscriber equipment) specific reference signals (UE-Specific RS).At receiving terminal, UE utilizes the UE specific reference signals to carry out channel estimating, can obtain down channel, thereby recovers descending transmission data.
Introduce UL-MIMO (Uplink MIMO) in LTE-A (senior Long Term Evolution) system, support maximum 4 antennas of UE side to send.In the prior art, use the precoding based on code book during up the transmission, the reference signal that the base station sends according to UE, estimate up channel, and the pre-coding matrix that search is mated with it most from code book, the sequence number of this pre-coding matrix in code book is called as pre-coding matrix indication (Precoding Matrix Indicator, referred to as PMI), then this PMI is handed down to UE, UE mechanically uses pre-coding matrix corresponding to this PMI to carry out precoding in up emission, to mate approx up channel.But owing to inevitably having quantization error in the process of codebook quantification, and code book can only search in the confined space, well match channels.Therefore, the up precoding emission process of prior art does not take full advantage of TDD channel reciprocity characteristics.
Summary of the invention
The technical problem that the present invention solves provides a kind of up precoding launching technique and device, under LTE-A TDD Uplink MIMO situation, takes full advantage of the TDD channel reciprocity, so that UE can more independently carry out up precoding emission.
For solving the problems of the technologies described above, the invention provides a kind of up precoding launching technique, described method comprises:
The base station is judged when allowing the autonomous up precoding of subscriber equipment (UE), notifies described UE to adopt autonomous up precoding pattern to carry out up precoding emission.
Further, described autonomous up precoding pattern refers to:
The uplink pre-coding matrix that the PMI that described UE uses described base station to issue is corresponding carries out up precoding;
Perhaps, the basis of the uplink pre-coding matrix that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding;
Perhaps, described UE uses and carries out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer;
Perhaps, described UE adopts the mode of non-code book to carry out up precoding.
Further, pre-coding matrix indication (PMI) information that described base station reports according to described UE is learnt the PMI value calculated in PMI value that described UE calculates and described base station not simultaneously, the autonomous up precoding of the judgement described UE of permission.
Further, described base station is according to multiple-input and multiple-output (MIMO) pattern of described UE, when learning that described UE is current and not being in multiuser MIMO (MU-MIMO) pattern, judge to allow the autonomous up precoding of described UE, and described base station temporarily is not scheduling to it MU-MIMO pattern.
Further, described base station also indicates described UE to estimate the mode of uplink pre-coding matrix when notifying described UE to adopt autonomous up precoding pattern, comprising:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
Further, described base station sends the reference signal that is used for channel estimating to described UE when notifying described UE to adopt autonomous up precoding pattern;
Described reference signal for channel estimating comprises following one or more: downstream measurement reference signal (CSI-RS), cell specific reference signal (Cell-Specific RS) or UE specific reference signals (UE-Specific RS).
Further, described base station notifies described UE to adopt autonomous up precoding pattern by control signal.
Further, described method also comprises:
The effect of the autonomous up precoding of described UE is weighed in described base station, and determines whether notify described UE to stop autonomous up precoding pattern according to the effect of weighing.
Further, described base station is in without open loop link circuit self-adapting (OLLA) situation, Block Error Rate (BLER) value according to statistics judges whether to notify described UE to stop autonomous precoding pattern, if the BLER value of statistics be higher than target BLER value or with the difference of described target BLER value less than first threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern;
Described base station is having in the OLLA situation, CQI under the autonomous precoding pattern and described base station are compared based on the CQI value that the PMI that issues calculates, if the CQI value under the autonomous precoding pattern is lower than the CQI value calculated the base station or the difference of the two less than second threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern.
Further, described base station is according to the PMI value of the actual use of described UE feedback, calculate the PMI value of the actual use of described UE and the difference of the PMI value that described base station issues, if this difference then notifies described UE to stop autonomous precoding pattern less than the 3rd predetermined threshold value;
Perhaps, the correction of the uplink pre-coding matrix of the PMI value correspondence that described base station issues with respect to described base station according to the pre-coding matrix of the actual use of described UE feedback, draw the pre-coding matrix of actual use, calculate the CQI value under the autonomous precoding pattern and compare based on the CQI value that the PMI that issues calculates with described base station, if the CQI value under the autonomous precoding pattern that calculates is lower than CQI value that described base station calculates based on the PMI that issues or the difference of the two less than the 4th predetermined threshold value, then notify described UE to stop autonomous precoding pattern.
The present invention also provides a kind of up precoding launching technique,
UE receives the notice of base station, adopts autonomous up precoding pattern to carry out up precoding emission;
Wherein, described autonomous up precoding pattern refers to: the uplink pre-coding matrix that the PMI that described UE uses described base station to issue is corresponding carries out up precoding; Perhaps, the uplink pre-coding matrix basis that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding; Perhaps, use described UE to carry out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer; Perhaps, described UE adopts the mode of non-code book to carry out up precoding.
Further, the process of described up precoding emission specifically comprises:
Described UE estimates descending channel information according to the reference signal that described base station sends, and the uplink channel information of utilizing channel reciprocity to obtain;
Described UE estimates uplink pre-coding matrix according to the uplink channel information that obtains, and uses the uplink pre-coding matrix of estimating to carry out up precoding emission.
Further, described method also comprises:
Described UE reports PMI information according to default reporting policy to the base station, described PMI information comprises:
The PMI value that described UE calculates;
Perhaps, the different indication of PMI value that issues of the PMI value calculated of described UE and described base station.
Further, described default reporting policy comprises:
If described UE finds that the PMI value of calculating is different from the PMI value that described base station issues, then report the described PMI information of calculating to described base station;
Perhaps, described UE regularly reports described base station with the PMI value of calculating.
Further, described UE is according to the following indication of described base station, the mode of Selectivity Estimating uplink pre-coding matrix:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
Further, described method also comprises:
After described UE adopts autonomous up precoding pattern to carry out up precoding emission, PMI value to the actual use of described base station feedback, the correction that the uplink pre-coding matrix basis that the PMI that perhaps issues in described base station to described base station feedback is corresponding increases is so that the effect of the autonomous up precoding of described UE is weighed in described base station.
The present invention also provides a kind of up precoding emitter, and described device comprises the up sending mode notification unit in the base station, wherein:
Described up sending mode notification unit is used for, and judges whether to allow the autonomous up precoding of UE, when allowing the autonomous up precoding of UE, notifies described UE to adopt autonomous up precoding pattern to carry out up precoding emission.
Further, described up sending mode notification unit is used for, and judges whether in such a way to allow the autonomous up precoding of UE:
Pre-coding matrix indication (PMI) information that reports according to described UE is learnt the PMI value calculated in PMI value that described UE calculates and described base station not simultaneously, the autonomous up precoding of the judgement described UE of permission;
And/or, multiple-input and multiple-output (MIMO) pattern according to described UE, when learning that described UE is current and not being in multiuser MIMO (MU-MIMO) pattern, judge to allow the autonomous up precoding of described UE, and described base station temporarily is not scheduling to it MU-MIMO pattern.
Further, described up sending mode notification unit also is used for, and when notifying described UE to adopt autonomous up precoding pattern, also indicates described UE to estimate the mode of uplink pre-coding matrix, comprising:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
Further, described device also comprises the reference signal transmitting element,
Described reference signal transmitting element is used for, and sends the reference signal that is used for channel estimating to described UE;
Wherein said reference signal for channel estimating comprises following one or more: CSI-RS, Cell-Specific RS or UE-Specific RS.
Further, described device comprises that also control signal issues the unit,
Described control signal issues the unit and is used for, and by issuing control signal to described UE, notifies described UE to adopt autonomous up precoding pattern.
Further, described device also comprises from main effect weighs the unit,
Describedly weigh the unit from main effect and be used for, weigh the effect of the autonomous up precoding of described UE;
Described up sending mode notification unit also is used for, and weighs the effect that the unit is weighed according to described from main effect, determines whether notify described UE to stop autonomous up precoding pattern.
Further, describedly weigh the unit from main effect and be used for: in without the OLLA situation, statistics BLER value; Perhaps, having in the OLLA situation, the CQI under the autonomous precoding pattern and described base station are being compared based on the CQI value that the PMI that issues calculates; Perhaps, according to the PMI value of the actual use of described UE feedback, calculate the PMI value of the actual use of described UE and the difference of the PMI value that described base station issues; Perhaps, the correction of the pre-coding matrix of the PMI value correspondence that issues with respect to described base station according to the pre-coding matrix of the actual use of described UE feedback, draw the pre-coding matrix of actual use, calculate the CQI value under the autonomous precoding pattern and compare based on the CQI value that the PMI that issues calculates with described base station;
Described up sending mode notification unit is used for, in without the OLLA situation, if the described BLER value of weighing the unit statistics from main effect be higher than target BLER value or with the difference of described target BLER value less than first threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern; Perhaps, having in the OLLA situation, if the CQI value under the autonomous precoding pattern is lower than the CQI value calculated the base station or the difference of the two less than second threshold value of being scheduled to, then notifying described UE to stop autonomous precoding pattern; Perhaps, if the difference of the PMI value that the PMI value of the actual use of described UE and described base station issue then notifies described UE to stop autonomous precoding pattern less than the 3rd predetermined threshold value; Perhaps, if describedly weigh CQI value under the autonomous precoding pattern that the unit calculates from main effect and be lower than CQI value that described base station calculates based on the PMI that issues or the difference of the two less than the 4th threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern.
The present invention also provides a kind of up precoding emitter, and described device comprises uplink pre-coding matrix estimation unit and the up precoding transmitter unit among the UE, wherein:
Described uplink pre-coding matrix estimation unit is used for, and according to the notice of base station, adopts autonomous up precoding model estimation uplink pre-coding matrix;
Described up precoding transmitter unit is used for, and the uplink pre-coding matrix that uses described uplink pre-coding matrix estimation unit to estimate carries out up precoding emission.
Further, described uplink pre-coding matrix estimation unit is used for:
The uplink pre-coding matrix that the PMI that uses described base station to issue is corresponding carries out up precoding;
Perhaps, the uplink pre-coding matrix basis that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding;
Perhaps, use described UE to carry out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer;
Perhaps, adopt the mode of non-code book to carry out up precoding.
Further, described device also comprises:
The information reporting unit is used for reporting PMI information to the base station according to default reporting policy, and described PMI information comprises: the PMI value that described UE calculates; Perhaps, the different indication of PMI value that issues of the PMI value calculated of described UE and described base station;
Wherein, described default reporting policy comprises: if described UE finds that the PMI value of calculating is different from the PMI value that described base station issues, then report the described PMI information of calculating to described base station; Perhaps, described UE regularly reports described base station with the PMI value of calculating.
Further, described device also comprises uplink channel estimation of equal value unit, wherein:
Described uplink channel estimation of equal value unit is used for, and estimates descending channel information according to the reference signal that described base station sends, and the uplink channel information of utilizing channel reciprocity to obtain;
Described uplink pre-coding matrix estimation unit is used for, and estimates uplink pre-coding matrix according to the uplink channel information that described uplink channel estimation of equal value unit obtains.
Further, described uplink pre-coding matrix estimation unit also is used for, according to the following indication of described base station, and the mode of Selectivity Estimating uplink pre-coding matrix:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
Further, described information reporting unit also is used for, PMI value to the actual use of the described UE of described base station feedback, the correction that the uplink pre-coding matrix basis that the PMI that perhaps issues in described base station to described base station feedback is corresponding increases is so that the effect of the autonomous up precoding of described UE is weighed in described base station.
Adopt the present invention, UE can independently carry out up precoding emission, overcome when up link only adopted the pre-coding matrix that issues based on eNode B to carry out up transmission simply in the past, the code book that eNode B selects can not fine match channels problem, thereby better match channels, improve the uplink transmit performance, reduce system's Packet Error Ratio; And if adopt the non-codebook precoding method, and then can further overcome the quantization error that code book exists, match channels is accurately improved the performance of up link.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the up precoding launching technique of the UE of the embodiment of the invention;
Accompanying drawing 2 is the schematic block diagrams according to the up precoding emission system of the embodiment of the invention.
Embodiment
The up precoding launching technique that present embodiment provides, adopt following technical scheme:
Step 1, UE reports the relevant informations such as PMI to eNode B;
Step 2, eNode B notice UE can adopt autonomous up precoding pattern;
Under autonomous up precoding pattern, the uplink pre-coding matrix that the PMI that UE can use described base station to issue is corresponding carries out up precoding;
Perhaps, the uplink pre-coding matrix basis that the PMI that UE issues in described base station is corresponding increases a correction, uses revised PMI to carry out up precoding;
Perhaps, UE uses and carries out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer;
Perhaps, UE can also adopt non-codebook mode to carry out up precoding.
Step 3, eNode B issues control signal to UE, and notice UE adopts autonomous up precoding pattern.
Step 4, UE adopts autonomous up precoding pattern to carry out up precoding emission according to the notice of base station;
Wherein, the UE process of carrying out up precoding emission specifically comprises:
The reference signal that UE utilizes eNode B to send is estimated down channel, thereby obtains up channel of equal value;
UE carries out uplink pre-coding matrix and estimates according to up channel of equal value; Wherein, this uplink pre-coding matrix can be uplink pre-coding matrix corresponding to PMI that the base station issues, or increase the result of a correction on this uplink pre-coding matrix basis, also can be the uplink pre-coding matrix that more mates with channel that UE independently selects from code book, can also be the uplink pre-coding matrix that goes out according to channel estimation calculation;
UE uses the uplink pre-coding matrix of estimating to carry out up precoding emission.
Step 5, eNodeB weighs the effect of the autonomous precoding of UE, to determine whether to stop autonomous precoding pattern.
For making the purpose, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing embodiments of the invention are elaborated.Need to prove, in the situation that do not conflict, the embodiment among the application and the feature among the embodiment be combination in any mutually.
As shown in Figure 1, the up precoding launching technique of the embodiment of the invention mainly may further comprise the steps:
Step S101, UE reports PMI information to eNode B;
Adopt based on the effect that issues codebook mode for initiatively reporting to eNode B, UE carries out pre-coding matrix indication (PMI) and calculates, and can take following reporting policy with the PMI information reporting to eNode B:(1) if find that the PMI that UE calculates is different from the PMI that eNode B issues, the UE active with this information reporting to eNode B; (2) UE regularly reports eNode B with the PMI that estimates.
Need to prove, in the prior art, UE can carry out descending PMI according to the number of transmit antennas of actual downstream channel and eNode B and calculate, and among the present invention, is to carry out up PMI according to the number of transmit antennas of up channel of equal value and UE to calculate.For example, UE is 2 antennas, and eNode B is 4 antennas, and so descending PMI calculates the down channel that is based on 4*2, goes to select from 4 antenna codebooks; And up PMI calculates the up channel of equal value that is based on 2*4, goes to select from 2 antenna codebooks.
Particularly, the mode that reports can be: (1) reports eNode B with the PMI value that UE calculates, suggestion eNode B consider eNode B that issue with PMI value UE calculating; (2) PMI that calculates to eNode B indication UE of UE and eNode B be handed down to UE PMI value different, advise that eNode B permission UE uses autonomous up precoding mode.Wherein, a kind ofly PMI to be reported eNode B compared to front, may need the mode of a plurality of bits; In rear a kind of mode, UE only need tell eNode B, and whether the PMI that UE calculates is consistent with base station calculating, only represents to get final product with 1 bit.
Step S102, eNode B judge that permission UE adopts autonomous up precoding mode;
ENode B can judge whether to allow UE to adopt autonomous up precoding mode in the following manner: (a) information that reports based on UE of eNode B judges whether to allow UE to adopt autonomous up precoding mode, for example: for the above-mentioned mode (1) that reports: eNode B sees that the PMI difference of PMI that UE reports and its calculating is larger, for reporting mode (2): the PMI that eNode B sees PMI that UE indication UE calculates and eNode B calculating can allow UE to adopt autonomous up precoding mode not simultaneously; (b) eNode B initiatively allows UE to adopt autonomous up precoding mode, for example eNode B knows current MU-MIMO (the Multi-User MIMO that is not in of UE, multiuser MIMO) pattern, perhaps eNode B sees the transmission that PMI that UE issues based on eNode B carries out, when frame error rate is more high, can adopt autonomous up precoding pattern by proactive notification UE.
ENode B allows UE to adopt another condition of autonomous up precoding mode to be, the current MU-MIMO pattern that is not in of known this UE of eNode B, in, and temporarily it is not scheduling to the MU-MIMO pattern.This be because, in the multiuser MIMO situation, when UE selects pre-coding matrix (PM), need to consider two factors, one is oneself channel of best coupling, another is the interference that reduces as far as possible other user, and namely pre-coding matrix and other user's channel relevancy is minimum, preferably can quadrature.
ENode B is after judging that permission UE adopts autonomous up precoding pattern, a kind of feasible method of notice UE is to increase a kind of up sending mode, to be different from existing precoding mode based on code book, for example can indicate UE to adopt this new sending mode by the RRC signaling.
Step S103, eNode B is handed down to UE with control signal;
For adopting the required control signal of new sending mode to send to UE, the execution mode of the present embodiment is: eNode B sends to UE by the Downlink Control Information (DCI) of down control channel (PDCCH) carrying with the required control signal of the up transmission of UE.For example can based on LTE R10 DCI Format4, by it is suitably revised, be used for sending the required control signal of up autonomous precoding.
Territory relevant with up precoding among the DCI Format4 is " precoding information and the number of plies " (Precoding information and number of layers) information.When adopting new autonomous up precoding mode, therefore no longer need precoding information (being PMI), to possible being revised as of DCI Format4: (1) does not need to send existing " precoding information and the number of plies " (Precoding information and number of layers) information; (2) keep " number of plies " (number of layers) information; (3) increase by 1 bit flag position, be used to indicate UE and can adopt autonomous up precoding mode.
After UE receives the notice of eNode B, adopt autonomous up precoding mode to carry out up precoding emission, but after UE receives this notice, also can decide the autonomous up precoding mode that whether adopts in its sole discretion.
Further, when eNode B notice UE can adopt autonomous up precoding mode, can also indicate UE to estimate the mode of uplink pre-coding matrix, the first is the autonomous precoding of using based on code book, namely must select pre-coding matrix from code book; The second is the autonomous precoding of using non-code book, does not namely select pre-coding matrix from code book; The third is to be determined to use the first by UE, or the second way.
The reference signal that step S104, UE utilize eNode B to send is estimated down channel, thereby obtains up channel of equal value;
Estimate up channel of equal value for ease of UE, eNode B need to send the reference signal for channel estimating.For example, in the existing downlink reference signal of LTE, downstream measurement reference signal (CSI-RS) is exactly an optional reference signal.The antenna port number that sends should be no less than the port number of up transmission.
Be used for the reference signal that down channel is estimated, also can select: the specific reference signal in residential quarter (Cell-specific reference signal, referred to as CSRS) or the specific reference signal of UE (UE-specific reference signal is referred to as UE-specific RS).
The reference signal that UE utilizes eNode B to send at the respective antenna port is carried out the down channel estimation, can obtain up channel of equal value.
Further, be more suitable for estimating in carrying out pre-coding matrix for making estimated result, can also be handled as follows: (1) averages in different granularities such as whole bandwidth, several RB or single RB; (2) channel estimation results is carried out normalization, to keep total transmitting power constant.
Step S105, UE carry out uplink pre-coding matrix and estimate according to up channel of equal value;
Pre-coding matrix estimates that two kinds of methods can be arranged: (1) is estimated based on the pre-coding matrix of code book; (2) pre-coding matrix of non-code book is estimated.
Can be that search is mated with up channel of equal value most in the code book (set of a plurality of pre-coding matrixes) at UE based on the pre-coding matrix method of estimation of code book, for example the pre-coding matrix of correlation maximum uses this pre-coding matrix to carry out up precoding emission.
The pre-coding matrix method of estimation of non-code book can be: on the basis of the pre-coding matrix that the PMI that issues in the base station is corresponding, increase a correction; Can also be: UE carries out pre-coding matrix and estimates according to the number of plies of uplink channel estimation result of equal value and transmission.Method of estimation includes but not limited to that (1) is based on the method for estimation of characteristic vector (EBB); (2) based on the method for estimation of Bo Dajiao (Grid of Beam is referred to as GOB).
Step S106, UE carry out up precoding emission;
Up precoding emission needs to carry out simultaneously precoding to sending data and demodulated reference signal.So that eNode B is to carrying out demodulation through the data of up precoding emission.For example in the LTE system, when uplink data sending is carried out up precoding, can carry out simultaneously up precoding to uplink demodulation reference signal (DMRS).
Step S107, eNode B weighs the effect of the autonomous precoding of UE, to determine whether to stop autonomous precoding pattern;
In the situation of the feedback information that does not have UE, for weighing the effect of the autonomous precoding of UE, without open loop link circuit self-adapting (Open-Loop Link Adaption, referred to as OLLA) in the situation, eNode B can judge whether to close autonomous precoding pattern according to BLER (Block Error Rate, the Block Error Rate) value of statistics, for example, if the BLER value well below target BLER value (10%), then keeps autonomous precoding pattern; If the BLER value be higher than target BLER value or with target BLER value quite (such as the two difference less than the first threshold value), then stop autonomous precoding pattern.Having in the open loop link circuit self-adapting situation, the base station can be with (the Channel Quality Indicator of the CQI in the autonomous precoding situation, channel quality indication) CQI that the PMI that issues based on oneself with the base station calculates compares, if the CQI in the autonomous precoding situation is lower than the CQI that calculates the base station or quite (such as the two difference less than the second threshold value), then stop autonomous precoding pattern, otherwise keep autonomous precoding pattern.
Having under the situation of feedback, the effect of the autonomous precoding of UE can be weighed according to the following information of UE feedback in the base station:
The difference (delta_PMI) of the PMI that the PMI of the actual use of UE or this PMI and eNode B issue, eNode B judges whether to stop autonomous precoding pattern according to the difference of two PMI, for example when two PMI differences during greater than the 3rd threshold value that arranges, keep autonomous precoding pattern, when two PMI differences during less than or equal to the 3rd threshold value, stop autonomous precoding pattern.
The correction of the pre-coding matrix that the PMI that the pre-coding matrix of the actual use of UE issues with respect to eNode B is corresponding.ENode B obtains actual pre-coding matrix according to this correction with the PMI that issues, carrying out CQI calculates, and compare with CQI that PMI that the base station issues based on oneself calculates, if the CQI in the autonomous precoding situation is lower than the CQI that calculates the base station or quite (such as the two difference less than the 4th threshold value), then stop autonomous precoding pattern, otherwise keep autonomous precoding pattern.
In addition, also provide a kind of up precoding emitter in the embodiment of the invention, this device mainly comprises the up sending mode notification unit in the base station, wherein:
Described up sending mode notification unit is used for, and judges whether to allow the autonomous up precoding of UE, when allowing the autonomous up precoding of UE, notifies described UE to adopt autonomous up precoding pattern to carry out up precoding emission.
Further, described up sending mode notification unit is used for, and judges whether in such a way to allow the autonomous up precoding of UE:
Pre-coding matrix indication (PMI) information that reports according to described UE is learnt the PMI value calculated in PMI value that described UE calculates and described base station not simultaneously, the autonomous up precoding of the judgement described UE of permission;
And/or, multiple-input and multiple-output (MIMO) pattern according to described UE, when learning that described UE is current and not being in multiuser MIMO (MU-MIMO) pattern, judge to allow the autonomous up precoding of described UE, and described base station temporarily is not scheduling to it MU-MIMO pattern.
Further, described up sending mode notification unit also is used for, and when notifying described UE to adopt autonomous up precoding pattern, also indicates described UE to estimate the mode of uplink pre-coding matrix, comprising:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
Further, described device also comprises the reference signal transmitting element,
Described reference signal transmitting element is used for, and sends the reference signal that is used for channel estimating to described UE;
Wherein said reference signal for channel estimating comprises following one or more: CSI-RS, Cell-Specific RS or UE-Specific RS.
Further, described device comprises that also control signal issues the unit,
Described control signal issues the unit and is used for, and by issuing control signal to described UE, notifies described UE to adopt autonomous up precoding pattern.
Further, described device also comprises from main effect weighs the unit,
Describedly weigh the unit from main effect and be used for, weigh the effect of the autonomous up precoding of described UE;
Described up sending mode notification unit also is used for, and weighs the effect that the unit is weighed according to described from main effect, determines whether notify described UE to stop autonomous up precoding pattern.
Further, describedly weigh the unit from main effect and be used for: in without the OLLA situation, statistics BLER value; Perhaps, having in the OLLA situation, the CQI under the autonomous precoding pattern and described base station are being compared based on the CQI value that the PMI that issues calculates; Perhaps, according to the PMI value of the actual use of described UE feedback, calculate the PMI value of the actual use of described UE and the difference of the PMI value that described base station issues; Perhaps, the correction of the pre-coding matrix of the PMI value correspondence that issues with respect to described base station according to the pre-coding matrix of the actual use of described UE feedback, draw the pre-coding matrix of actual use, calculate the CQI value under the autonomous precoding pattern and compare based on the CQI value that the PMI that issues calculates with described base station;
Described up sending mode notification unit is used for, in without the OLLA situation, if the described BLER value of weighing the unit statistics from main effect be higher than target BLER value or with the difference of described target BLER value less than first threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern; Perhaps, having in the OLLA situation, if the CQI value under the autonomous precoding pattern is lower than the CQI value calculated the base station or the difference of the two less than second threshold value of being scheduled to, then notifying described UE to stop autonomous precoding pattern; Perhaps, if the difference of the PMI value that the PMI value of the actual use of described UE and described base station issue then notifies described UE to stop autonomous precoding pattern less than the 3rd predetermined threshold value; Perhaps, if describedly weigh CQI value under the autonomous precoding pattern that the unit calculates from main effect and be lower than CQI value that described base station calculates based on the PMI that issues or the difference of the two less than the 4th threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern.
In addition, also provide a kind of up precoding emitter in the embodiment of the invention, this device mainly comprises uplink pre-coding matrix estimation unit and the up precoding transmitter unit among the UE, wherein:
Described uplink pre-coding matrix estimation unit is used for, and according to the notice of base station, adopts autonomous up precoding model estimation uplink pre-coding matrix;
Described up precoding transmitter unit is used for, and the uplink pre-coding matrix that uses described uplink pre-coding matrix estimation unit to estimate carries out up precoding emission.
Further, described uplink pre-coding matrix estimation unit is used for:
The uplink pre-coding matrix that the PMI that uses described base station to issue is corresponding carries out up precoding;
Perhaps, the uplink pre-coding matrix basis that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding;
Perhaps, use described UE to carry out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer;
Perhaps, adopt the mode of non-code book to carry out up precoding.
Further, described device also comprises:
The information reporting unit is used for reporting PMI information to the base station according to default reporting policy, and described PMI information comprises: the PMI value that described UE calculates; Perhaps, the different indication of PMI value that issues of the PMI value calculated of described UE and described base station;
Wherein, described default reporting policy comprises: if described UE finds that the PMI value of calculating is different from the PMI value that described base station issues, then report the described PMI information of calculating to described base station; Perhaps, described UE regularly reports described base station with the PMI value of calculating.
Further, described device also comprises uplink channel estimation of equal value unit, wherein:
Described uplink channel estimation of equal value unit is used for, and estimates descending channel information according to the reference signal that described base station sends, and the uplink channel information of utilizing channel reciprocity to obtain;
Described uplink pre-coding matrix estimation unit is used for, and estimates uplink pre-coding matrix according to the uplink channel information that described uplink channel estimation of equal value unit obtains.
Further, described uplink pre-coding matrix estimation unit also is used for, according to the following indication of described base station, and the mode of Selectivity Estimating uplink pre-coding matrix:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
Further, described information reporting unit also is used for, PMI value to the actual use of the described UE of described base station feedback, the correction that the uplink pre-coding matrix basis that the PMI that perhaps issues in described base station to described base station feedback is corresponding increases is so that the effect of the autonomous up precoding of described UE is weighed in described base station.
Further, as shown in Figure 2, also provide a kind of up precoding emission system in the embodiment of the invention, this system mainly comprises with lower unit:
Up sending mode notification unit 202 is used for eNode B notice UE and can adopts autonomous up precoding pattern.
Control signal issues unit 203, is used for eNode B and issues control signal to UE.
Uplink channel estimation of equal value unit 204 is used for UE and estimates down channel according to the reference signal that eNode B sends, thereby obtains up channel of equal value.
Uplink pre-coding matrix estimation unit 205, be used for UE according to up channel of equal value, carry out uplink pre-coding matrix and estimate, this pre-coding matrix both can be the pre-coding matrix that more mates with channel that UE independently selects from code book, also can be the wave beam formed matrix that goes out according to channel estimating.
Up precoding transmitter unit 206, UE use uplink pre-coding matrix to carry out up precoding emission.
In the present embodiment, weighing unit 207 from main effect links to each other with information reporting unit 201, the information such as correction of the uplink pre-coding matrix of the PMI value correspondence that the pre-coding matrix that is used for adopting the PMI value of actual uses of UE of feeding back after the autonomous precoding pattern or the actual use of UE according to UE issues with respect to described base station, the effect of the autonomous precoding of measurement UE.
It below only is preferred case study on implementation of the present invention; be not limited to the present invention; the present invention also can have other various embodiments; in the situation that do not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned each unit of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit unit, perhaps a plurality of unit in them or step are made into the single integrated circuit unit and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Claims (29)
1. a up precoding launching technique is characterized in that, described method comprises:
The base station is judged when allowing the autonomous up precoding of subscriber equipment (UE), notifies described UE to adopt autonomous up precoding pattern to carry out up precoding emission.
2. the method for claim 1 is characterized in that,
Described autonomous up precoding pattern refers to:
The uplink pre-coding matrix that the PMI that described UE uses described base station to issue is corresponding carries out up precoding;
Perhaps, the basis of the uplink pre-coding matrix that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding;
Perhaps, described UE uses and carries out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer;
Perhaps, described UE adopts the mode of non-code book to carry out up precoding.
3. the method for claim 1 is characterized in that,
Pre-coding matrix indication (PMI) information that described base station reports according to described UE is learnt the PMI value calculated in PMI value that described UE calculates and described base station not simultaneously, the autonomous up precoding of the judgement described UE of permission.
4. method as claimed in claim 2 or claim 3 is characterized in that,
Described base station is according to multiple-input and multiple-output (MIMO) pattern of described UE, when learning that described UE is current and not being in multiuser MIMO (MU-MIMO) pattern, judge to allow the autonomous up precoding of described UE, and described base station temporarily is not scheduling to it MU-MIMO pattern.
5. method as claimed in claim 1 or 2 is characterized in that,
Described base station also indicates described UE to estimate the mode of uplink pre-coding matrix when notifying described UE to adopt autonomous up precoding pattern, comprising:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
6. the method for claim 1 is characterized in that,
Described base station sends the reference signal that is used for channel estimating to described UE when notifying described UE to adopt autonomous up precoding pattern;
Described reference signal for channel estimating comprises following one or more: downstream measurement reference signal (CSI-RS), cell specific reference signal (Cell-Specific RS) or UE specific reference signals (UE-Specific RS).
7. the method for claim 1 is characterized in that,
Described base station notifies described UE to adopt autonomous up precoding pattern by control signal.
8. the method for claim 1 is characterized in that, described method also comprises:
The effect of the autonomous up precoding of described UE is weighed in described base station, and determines whether notify described UE to stop autonomous up precoding pattern according to the effect of weighing.
9. method as claimed in claim 8 is characterized in that,
Described base station is in without open loop link circuit self-adapting (OLLA) situation, Block Error Rate (BLER) value according to statistics judges whether to notify described UE to stop autonomous precoding pattern, if the BLER value of statistics be higher than target BLER value or with the difference of described target BLER value less than first threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern;
Described base station is having in the OLLA situation, CQI under the autonomous precoding pattern and described base station are compared based on the CQI value that the PMI that issues calculates, if the CQI value under the autonomous precoding pattern is lower than the CQI value calculated the base station or the difference of the two less than second threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern.
10. method as claimed in claim 8 is characterized in that,
The PMI value of the actual use of described UE and the difference of the PMI value that described base station issues are calculated according to the PMI value of the actual use of described UE feedback in described base station, if this difference then notifies described UE to stop autonomous precoding pattern less than the 3rd predetermined threshold value;
Perhaps, the correction of the uplink pre-coding matrix of the PMI value correspondence that described base station issues with respect to described base station according to the pre-coding matrix of the actual use of described UE feedback, draw the pre-coding matrix of actual use, calculate the CQI value under the autonomous precoding pattern and compare based on the CQI value that the PMI that issues calculates with described base station, if the CQI value under the autonomous precoding pattern that calculates is lower than CQI value that described base station calculates based on the PMI that issues or the difference of the two less than the 4th predetermined threshold value, then notify described UE to stop autonomous precoding pattern.
11. a up precoding launching technique is characterized in that,
UE receives the notice of base station, adopts autonomous up precoding pattern to carry out up precoding emission;
Wherein, described autonomous up precoding pattern refers to: the uplink pre-coding matrix that the PMI that described UE uses described base station to issue is corresponding carries out up precoding; Perhaps, the uplink pre-coding matrix basis that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding; Perhaps, use described UE to carry out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer; Perhaps, described UE adopts the mode of non-code book to carry out up precoding.
12. method as claimed in claim 11 is characterized in that, the process of described up precoding emission specifically comprises:
Described UE estimates descending channel information according to the reference signal that described base station sends, and the uplink channel information of utilizing channel reciprocity to obtain;
Described UE estimates uplink pre-coding matrix according to the uplink channel information that obtains, and uses the uplink pre-coding matrix of estimating to carry out up precoding emission.
13. method as claimed in claim 11 is characterized in that, described method also comprises:
Described UE reports PMI information according to default reporting policy to the base station, described PMI information comprises:
The PMI value that described UE calculates;
Perhaps, the different indication of PMI value that issues of the PMI value calculated of described UE and described base station.
14. method as claimed in claim 13 is characterized in that, described default reporting policy comprises:
If described UE finds that the PMI value of calculating is different from the PMI value that described base station issues, then report the described PMI information of calculating to described base station;
Perhaps, described UE regularly reports described base station with the PMI value of calculating.
15. method as claimed in claim 11 is characterized in that,
Described UE is according to the following indication of described base station, the mode of Selectivity Estimating uplink pre-coding matrix:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
16. method as claimed in claim 11 is characterized in that, described method also comprises:
After described UE adopts autonomous up precoding pattern to carry out up precoding emission, PMI value to the actual use of described base station feedback, the correction that the uplink pre-coding matrix basis that the PMI that perhaps issues in described base station to described base station feedback is corresponding increases is so that the effect of the autonomous up precoding of described UE is weighed in described base station.
17. a up precoding emitter is characterized in that, described device comprises the up sending mode notification unit in the base station, wherein:
Described up sending mode notification unit is used for, and judges whether to allow the autonomous up precoding of UE, when allowing the autonomous up precoding of UE, notifies described UE to adopt autonomous up precoding pattern to carry out up precoding emission.
18. device as claimed in claim 17 is characterized in that,
Described up sending mode notification unit is used for, and judges whether in such a way to allow the autonomous up precoding of UE:
Pre-coding matrix indication (PMI) information that reports according to described UE is learnt the PMI value calculated in PMI value that described UE calculates and described base station not simultaneously, the autonomous up precoding of the judgement described UE of permission;
And/or, multiple-input and multiple-output (MIMO) pattern according to described UE, when learning that described UE is current and not being in multiuser MIMO (MU-MIMO) pattern, judge to allow the autonomous up precoding of described UE, and described base station temporarily is not scheduling to it MU-MIMO pattern.
19. device as claimed in claim 17 is characterized in that,
Described up sending mode notification unit also is used for, and when notifying described UE to adopt autonomous up precoding pattern, also indicates described UE to estimate the mode of uplink pre-coding matrix, comprising:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
20. device as claimed in claim 17 is characterized in that, described device also comprises the reference signal transmitting element,
Described reference signal transmitting element is used for, and sends the reference signal that is used for channel estimating to described UE;
Wherein said reference signal for channel estimating comprises following one or more: CSI-RS, Cell-Specific RS or UE-Specific RS.
21. device as claimed in claim 17 is characterized in that, described device comprises that also control signal issues the unit,
Described control signal issues the unit and is used for, and by issuing control signal to described UE, notifies described UE to adopt autonomous up precoding pattern.
22. device as claimed in claim 17 is characterized in that, described device also comprises from main effect weighs the unit,
Describedly weigh the unit from main effect and be used for, weigh the effect of the autonomous up precoding of described UE;
Described up sending mode notification unit also is used for, and weighs the effect that the unit is weighed according to described from main effect, determines whether notify described UE to stop autonomous up precoding pattern.
23. device as claimed in claim 22 is characterized in that,
Describedly weigh the unit from main effect and be used for: in without the OLLA situation, statistics BLER value; Perhaps, having in the OLLA situation, the CQI under the autonomous precoding pattern and described base station are being compared based on the CQI value that the PMI that issues calculates; Perhaps, according to the PMI value of the actual use of described UE feedback, calculate the PMI value of the actual use of described UE and the difference of the PMI value that described base station issues; Perhaps, the correction of the pre-coding matrix of the PMI value correspondence that issues with respect to described base station according to the pre-coding matrix of the actual use of described UE feedback, draw the pre-coding matrix of actual use, calculate the CQI value under the autonomous precoding pattern and compare based on the CQI value that the PMI that issues calculates with described base station;
Described up sending mode notification unit is used for, in without the OLLA situation, if the described BLER value of weighing the unit statistics from main effect be higher than target BLER value or with the difference of described target BLER value less than first threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern; Perhaps, having in the OLLA situation, if the CQI value under the autonomous precoding pattern is lower than the CQI value calculated the base station or the difference of the two less than second threshold value of being scheduled to, then notifying described UE to stop autonomous precoding pattern; Perhaps, if the difference of the PMI value that the PMI value of the actual use of described UE and described base station issue then notifies described UE to stop autonomous precoding pattern less than the 3rd predetermined threshold value; Perhaps, if describedly weigh CQI value under the autonomous precoding pattern that the unit calculates from main effect and be lower than CQI value that described base station calculates based on the PMI that issues or the difference of the two less than the 4th threshold value of being scheduled to, then notify described UE to stop autonomous precoding pattern.
24. a up precoding emitter is characterized in that, described device comprises uplink pre-coding matrix estimation unit and the up precoding transmitter unit among the UE, wherein:
Described uplink pre-coding matrix estimation unit is used for, and according to the notice of base station, adopts autonomous up precoding model estimation uplink pre-coding matrix;
Described up precoding transmitter unit is used for, and the uplink pre-coding matrix that uses described uplink pre-coding matrix estimation unit to estimate carries out up precoding emission.
25. device as claimed in claim 24 is characterized in that,
Described uplink pre-coding matrix estimation unit is used for:
The uplink pre-coding matrix that the PMI that uses described base station to issue is corresponding carries out up precoding;
Perhaps, the uplink pre-coding matrix basis that the PMI that described UE issues in described base station is corresponding increases a correction, uses revised uplink pre-coding matrix to carry out up precoding;
Perhaps, use described UE to carry out up precoding from uplink pre-coding matrix corresponding to the PMI of host computer;
Perhaps, adopt the mode of non-code book to carry out up precoding.
26. device as claimed in claim 24 is characterized in that, described device also comprises:
The information reporting unit is used for reporting PMI information to the base station according to default reporting policy, and described PMI information comprises: the PMI value that described UE calculates; Perhaps, the different indication of PMI value that issues of the PMI value calculated of described UE and described base station;
Wherein, described default reporting policy comprises: if described UE finds that the PMI value of calculating is different from the PMI value that described base station issues, then report the described PMI information of calculating to described base station; Perhaps, described UE regularly reports described base station with the PMI value of calculating.
27. device as claimed in claim 24 is characterized in that, described device also comprises uplink channel estimation of equal value unit, wherein:
Described uplink channel estimation of equal value unit is used for, and estimates descending channel information according to the reference signal that described base station sends, and the uplink channel information of utilizing channel reciprocity to obtain;
Described uplink pre-coding matrix estimation unit is used for, and estimates uplink pre-coding matrix according to the uplink channel information that described uplink channel estimation of equal value unit obtains.
28. device as claimed in claim 24 is characterized in that,
Described uplink pre-coding matrix estimation unit also is used for, according to the following indication of described base station, and the mode of Selectivity Estimating uplink pre-coding matrix:
Indicate described UE selection based on the mode of code book;
Perhaps, indicate described UE to select the mode of non-code book;
Perhaps, indicate described UE to select based on the mode of code book or the mode of non-code book.
29. device as claimed in claim 26 is characterized in that,
Described information reporting unit also is used for, PMI value to the actual use of the described UE of described base station feedback, the correction that the uplink pre-coding matrix basis that the PMI that perhaps issues in described base station to described base station feedback is corresponding increases is so that the effect of the autonomous up precoding of described UE is weighed in described base station.
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