CN107800467A - beam selection method and device - Google Patents

beam selection method and device Download PDF

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Publication number
CN107800467A
CN107800467A CN201610801373.8A CN201610801373A CN107800467A CN 107800467 A CN107800467 A CN 107800467A CN 201610801373 A CN201610801373 A CN 201610801373A CN 107800467 A CN107800467 A CN 107800467A
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China
Prior art keywords
wave beam
wave
brs
index
feedback
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CN201610801373.8A
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Chinese (zh)
Inventor
刘敏
侯晓林
王新
蒋惠玲
刘丹谱
吴伟
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NTT Docomo Inc
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NTT Docomo Inc
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Priority to CN201610801373.8A priority Critical patent/CN107800467A/en
Priority to JP2019507926A priority patent/JP7104023B2/en
Priority to CN201780043866.2A priority patent/CN109792277B/en
Priority to PCT/CN2017/096357 priority patent/WO2018040858A1/en
Publication of CN107800467A publication Critical patent/CN107800467A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

This application provides a kind of beam selection method.This method includes：A, the 1st grade is pre-configured with to the corresponding relation between K levels wave beam and wave beam at different levels；B, the 1st grade of each wave beam is sent to user terminal UE；C, the beam index of UE feedbacks is received；D, determine to receive wave beam corresponding to beam index, if identified wave beam is not K level wave beams, each wave beam determined in next stage wave beam corresponding to wave beam is sent to UE, is then back to c；If identified wave beam is K level wave beams, the candidate beam that identified wave beam is selected as UE.The expense of beam selection can be reduced by the application, while improves the degree of accuracy of beam selection.

Description

Beam selection method and device
Technical field
The application is related to mobile communication technology, more particularly to a kind of beam selection method and device.
Background technology
At present, fourth generation mobile communication technology (4G) has begun to widely be deployed in all over the world, and the 5th generation moved The communication technology (5G) has become emerging research field.Extensive multiple-input and multiple-output (MIMO, Multiple-Input Multiple-Output application) has turned into a popular domain of 5G technologies.Compared with traditional MIMO technology, on a large scale MIMO can use more antennas at base station (eNB), to provide bigger handling capacity.Meanwhile in extensive MIMO technology Under further apply beam forming technique, it is possible to achieve sex service is more accurately pointed to, so as in identical space More communication links are provided, pass through the service capacity of this spatial reuse, further raising base station.
The content of the invention
The example of the application provides a kind of beam selection method.This method includes：
A, the 1st grade is pre-configured with to the corresponding relation between K levels wave beam and wave beam at different levels；Wherein, K is natural number；
B, the 1st grade of each wave beam is sent to user terminal UE；
C, the beam index of UE feedbacks is received；
D, determine to receive wave beam corresponding to beam index,
If identified wave beam is not K level wave beams, sends and determined in next stage wave beam corresponding to wave beam to UE Each wave beam, is then back to c；
If identified wave beam is K level wave beams, the candidate beam that identified wave beam is selected as UE.
The example of the application additionally provides a kind of base war for realizing above-mentioned beam selection method, including：
Configuration module, for carrying out beam selection configuration, determine the 1st grade to K levels wave beam at different levels and wave beam at different levels it Between corresponding relation；Wherein, K is natural number；
Beam reference signal transmitting module, for sending wave beam reference signal to user terminal UE；
Feedback reception module, for receiving the beam index of UE feedbacks；
Control module, for the 1st grade of ripple for controlling wave beam reference signal sending module to be configured to UE send configuration modules The beam reference signal of beam；After the beam index that feedback reception module receives UE feedbacks, determine that UE feeds back beam index Corresponding wave beam, and judge the wave beam whether be K levels wave beam, if it is, the wave beam be UE selection wave beam；If no It is then to control wave beam reference signal sending module to send the beam reference signal of next stage wave beam corresponding to the wave beam to UE.
Beam selection scheme described herein, measured without candidate beam to be issued to UE one by one, so as in candidate Wave beam number more in the case of can substantially reduce the expense of beam selection process.In addition, selected in wave beam described herein Select in scheme, it is desirable to which the width of higher level's wave beam is both greater than the width of subordinate's wave beam, and therefore, UE first selects from the wave beam of wider width Select, then selected from the wave beam of narrower width, so as to preferably resist influence of the phase noise to beam selection accuracy, The accuracy of beam selection is improved, and then ensures communication quality.
Brief description of the drawings
In order to it is clearer explanation the application in technical scheme, in being described below to embodiment it is required use it is attached Figure is briefly described, it should be apparent that, drawings in the following description are only some examples of the application, general for this area For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.Its In,
Fig. 1 shows the example of the wave beams at different levels described in one example of the application；
Fig. 2 shows the flow chart of the beam selection method described in one example of the application；
Fig. 3 shows that base station carries out the process of beam selection with single UE；
Fig. 4 shows that base station carries out the process of beam selection with multiple UE；
Fig. 5 shows the flow chart of the beam selection method described in another example of the application；
Fig. 6 shows the example for carrying out phase intense adjustment described in one example of the application to selected wave beam；
Fig. 7 shows the method flow that phase intense adjustment is carried out to selected wave beam described in one example of the application Figure；
Fig. 8 a and 8b show showing selected wave beam progress phase intense adjustment described in another example of the application Example；And
Fig. 9 shows the internal structure schematic diagram of the base station described in one example of the application.
Embodiment
Below in conjunction with accompanying drawing, the technical scheme in the application is clearly and completely described, it is clear that described Example is a part of example of the application, rather than whole examples.Based on the example in the application, those of ordinary skill in the art The every other example obtained under the premise of creative work is not made, belong to the scope of the application protection.
As it was previously stated, by extensive MIMO technology and beam forming technique are combined can obtain more antennas with And more wave beams, for example, the number for the wave beam that can be used in 5G systems can reach 512, it is even more more.With day The increase of line number and wave beam number and precision, the capacity of system can be significantly increased.And with numbers of beams purpose Increase, the width of each wave beam also becomes more and more narrow, so as to realize more accurate sensing sex service.In such case Under, how mobile terminal (UE) carries out the selection of wave beam also into one of 5G communication system urgent problems to be solved.
Described as discussed above, in the extensive MIMO technology of application, the number and precision of the wave beam that can be generated all will It is significantly increased, if all wave beams are issued into UE one by one by way of limit, then is measured by UE and therefrom carried out one by one Selection will produce very big signaling consumption.Therefore, the example of the application gives a kind of beam selection method, selected by being classified The mode for selecting wave beam carries out beam selection, so as to avoid that excessive signaling consumption is produced during beam selection.
In the example of the present invention, before beam selection is carried out, it is necessary first to carry out the basic configuration of beam selection.This A little configurations mainly include the following aspects：
First, it is determined that treating the number N of the candidate beam of selection.In the example of the present invention, by base station generation can be by The wave beam of UE selections is referred to as candidate beam.The number of above-mentioned candidate beam can be relevant with the transmitting antenna number of base station.In base station After the completion of configuration, the general number N that can determine that the wave beam that the base station can generate.Certainly, the number of above-mentioned candidate beam It can be determined by system configuration.
Second, it is determined that the series K of classification beam selection method.The series K of above-mentioned classification beam selection can be fixed Empirical value, for example, it is contemplated that the complexity to classification beam selection method directly sets beam selection when carrying out system configuration Series K=3.The series K of above-mentioned beam selection can also determine according to specific application scenarios and demand, such as time delay It is required that higher system, it is possible to reduce beam selection series K is to reduce time delay.
3rd, according to N number of candidate beam and the series K of beam selection, it is determined that from the 1st grade into K level wave beams, it is each The wave beam that level includes.In the example of the application, and the 1st grade of wave beam to K levels needs to meet following require：
1) each wave beam of i-stage corresponds to the wave beam of two and above i+1 level respectively, wherein, i=[1, K-1].
2) wave beam of i+1 level corresponds to the wave beam of 1 i-stage.
3) each wave beam of i-stage can correspond to the wave beam of two and above i+1 level, and the width of i-stage wave beam respectively Degree will be greater than the width of i+1 level wave beam.
4) K levels wave beam is above-mentioned N number of candidate beam.
5) directional correlation of corresponding two and above i+1 level wave beam is distinguished in the direction of each wave beam of i-stage. The correlation of the coefficient corresponding two of some i-stage wave beam and the coefficient of above i+1 level wave beam can specifically be shown as Coefficient is more than threshold value set in advance.I.e. if the coefficient correlation of two beam coefficients is more than threshold value set in advance, then it is assumed that The two wave beams are related；Otherwise it is assumed that the two wave beams are uncorrelated.The coefficient of above-mentioned wave beam can be specifically wave beam array because Sub (Array Factor).
The above-mentioned 1st grade of wave beam to K levels can also meet to require as follows：The width of i-stage wave beam will be greater than i+1 level The width of wave beam.
Fig. 1 shows the example of a fixed wave beams at different levels.In this example, candidate beam has 8, beam selection Series is 3 grades.As shown in figure 1, in this example, first order wave beam (Level 1) has 2, wave beam B1And B2, each wave beam difference 2 wave beams in 4 wave beams of corresponding second level wave beam (Level 2).For example, wave beam B1Corresponding wave beam B11And B12, wave beam B2 Corresponding wave beam B21And B22.Each wave beam in the wave beam of the second level 4 corresponds to 8 wave beams of third level wave beam (Level 3) respectively In 2 wave beams.For example, wave beam B11Corresponding wave beam B111And B112, wave beam B12Corresponding wave beam B121And B122, wave beam B21Corresponding ripple Beam B211And B212, wave beam B22Corresponding wave beam B221And B222.The third level is 8 candidate beam B111、B112、B121、B122、B211、 B212、B221And B222.It will be seen from figure 1 that the width of the 1st grade of 2 wave beams is respectively greater than the width of the 2nd grade of 4 wave beam；And the 2nd The width of 4 wave beams of level is respectively greater than the width of 8 wave beams of 3rd level.And wave beam B1With wave beam B11And B12Directional correlation, wave beam B2With wave beam B21And B22Directional correlation, wave beam B11With wave beam B111And B112Directional correlation, wave beam B12With wave beam B121And B122 Directional correlation, wave beam B21With wave beam B211And B212Directional correlation, and wave beam B22With wave beam B221And B222Direction phase Close.
After above-mentioned setting is completed, you can to proceed by beam selection.Fig. 2 is shown described in present application example Beam selection method.As shown in Fig. 2 this method comprises the following steps：
Step 201：Base station sends the 1st grade of each wave beam to UE.
In the example of the application, during beam selection, base station to UE send be each wave beam reference believe Number.Beam reference signal (BRS) is referred to as herein.
Inform which UE itself will take to send BRS to UE, it is necessary to carry out the resource distribution of correlation in advance in base station Which of subframe (subframe) or time instance (time instance) and holding time example running time-frequency resource are sent BRS.In this example, above-mentioned configuration can be referred to as BRS resource distributions.Generally, base station can pass through RRC control signaling or dynamic State control signaling carries out BRS resource distributions；It can also be touched again by dynamic signaling after RRC has pre-defined BRS resources Hair；It can also be pre-configured in each subframe or time instance and include BRS.
Under normal circumstances, base station needs to indicate that UE base stations will carry out BRS transmission in which subframe or time instance.Example Such as, BRS instruction ratios are increased on the Downlink Control Information (DCI) relevant with downlink transfer that can be transmitted on down control channel Special BRS_ENABLE, wherein, show that base station will start to send BRS during BRS_ENABLE=1.UE is detecting BRS indication bits BRS_ENABLE will carry out wave beam detection when being 1.
Step 202：UE carries out wave beam detection, therefrom finds the best wave beam of receptivity as selected wave beam, and The beam index (BI) of selected wave beam is fed back into base station.
In order to allow the beam index of wave beam selected by from UE to base station feedback, base station is also required to pre-defined UE feedback model And carry out the configuration of correlation, that is, inform that UE is fed back using which kind of feedback model.In this example, above-mentioned feedback model can be with Including：1) without feedback；2) beam index of wave beam selected by only feeding back；And 3) except the beam index of wave beam selected by feedback Outside, feedback channel quality is also needed to indicate (CQI, Channel Quality Indicator), order instruction (RI, Rank Indication), pre-coding matrix instruction (PMI, Precoding Matrix Indicator) etc..
Normal conditions, it is also desirable to increase extra feedback model indication bit to indicate UE is carried out using which kind of feedback model Feedback.For example, increase feedback model indication bit on the DCI relevant with downlink transfer transmitted on down control channel FEEDBACK_MODE, wherein, FEEDBACK_MODE=0 shows to be fed back；FEEDBACK_MODE=1 shows UE Only need the beam index of wave beam selected by feeding back；FEEDBACK_MODE=2 shows that UE not only needs to feed back the ripple of selected wave beam Beam index also needs to feed back the parameters such as current CQI, RI and PMI.In this case, UE will indicate ratio according to feedback model Special instruction is fed back accordingly.For example, when UE detects FEEDBACK_MODE=1, by wave beam only selected by feedback Beam index；When UE detects FEEDBACK_MODE=2, by the beam index of wave beam selected by feedback, CQI, RI and PMI。
The opportunity fed back on UE, defined in long evolving system (LTE) on reference signal (RS) transmission with The minimum interval of channel status instruction (CSI) feedback.Therefore, UE can be true by the following two kinds mode in the example of the present invention Surely the opportunity fed back：
(1) opportunity of feedback is determined by the transmission time of reference signal, such as receives reference signal at the X moment, then UE It will be fed back at the X+N moment.
(2) depending on feedback time triggers (Trigger) by CSI feedback, as UE will be after CSI feedback trigger signal be received instead Feedback.
Step 203：Base station receives the beam index of UE feedbacks, it is determined that wave beam corresponding to received beam index.
In this step, the wave beam that base station can be according to selected by the beam index of reception directly determines UE.
Step 204：Whether wave beam determined by the judgement of base station is K level wave beams, if identified wave beam is not K level ripples Beam, then perform step 205；If identified wave beam is K level wave beams, step 206 is performed.
Step 205：Base station sends each wave beam determined in next stage wave beam corresponding to wave beam to UE, is then back to step Rapid 202.
In this step, base station determines that the method for each wave beam in next stage wave beam corresponding to wave beam can to UE transmissions To refer to above-mentioned steps 201, will not be repeated here.
Step 206：Wave beam of the base station using identified wave beam as UE final choices.
By the method for above-mentioned classification beam selection, measured without candidate beam to be issued to UE one by one, so as to wait The expense of beam selection process can be substantially reduced in the case of selecting wave beam number more.
Fig. 3 is shown in the case of an only UE, and the process of beam selection is carried out between base station and single UE.Such as figure Shown in 3, resource location of the base station first in descending sub frame #0 shown in dash area sends two of as shown in Figure 1 the 1st grade Wave beam B1And B2Reference signal.UE, by measurement, have selected the wave beam B of better performances after the two wave beams are detected2, and In the beam index of wave beam selected by sub-frame of uplink #5 feedbacks, namely BI=2.Next, base station shade in descending sub frame #6 Resource location shown in part sends wave beam B as shown in Figure 12Two wave beam B in the 2nd grade of corresponding wave beam21And B22Ginseng Examine signal.UE, by measurement, have selected the wave beam B of better performances after the two wave beams are detected22, and in sub-frame of uplink #10 The beam index of wave beam selected by feedback, namely BI=22.Finally, money of the base station in descending sub frame #11 shown in dash area Source position sends wave beam B as shown in Figure 122Two wave beam B in corresponding 3rd level wave beam221And B222Reference signal.UE exists After detecting the two wave beams, by measurement, the wave beam B of better performances have selected222, and selected by sub-frame of uplink #15 feedbacks The beam index of wave beam, namely BI=223, meanwhile, according to the instruction of feedback model indication bit also fed back current CQI, The information such as RI and PMI.So far, beam selection process is completed, it can thus be seen that by selection course three times, base station is sent out altogether 6 wave beams are sent, UE can accurately choose most suitable wave beam from 8 candidate beams.
Fig. 4 shows that in the case where there is multiple UE base station carries out the process of beam selection with multiple UE.In this example, The number for assuming initially that candidate beam is 512；The series of beam selection is 3, namely has 8 wave beams per one-level, and per one-level Wave beam correspond to 8 wave beams of next stage.The base station covering UE numbers be 10, including UE1, UE2 ..., UE10.This In the case of, as shown in figure 4, base station sends the 1st grade of 8 wave beam B first1To B8Reference signal.Each UE detect this 8 After individual wave beam, by measurement, the wave beam of better performances is have selected respectively, UE1 and UE2 have selected wave beam B1, and fed back corresponding BI；UE3 have selected wave beam B2, and fed back corresponding BI；UE4 and UE5 have selected wave beam B3, and fed back corresponding BI； UE6, UE7 and UE8 have selected wave beam B5, and fed back corresponding BI；UE9 have selected wave beam B6, and fed back corresponding BI； And UE10 have selected wave beam B7, and fed back corresponding BI.Next, base station sends wave beam B as shown in Figure 4 respectively11~ B18、B21~B28、B31~B38、B51~B58、B61~B68And B71~B78Reference signal.Each UE is detecting these wave beams Afterwards, by measurement, the wave beam of better performances is have selected respectively, UE1 have selected wave beam B11, and fed back corresponding BI；UE2 is selected Wave beam B15, and fed back corresponding BI；UE3 have selected wave beam B25, and fed back corresponding BI；UE4 have selected wave beam B32, And corresponding BI is fed back；UE5 have selected wave beam B36, and fed back corresponding BI；UE6, UE7 and UE8 have selected wave beam B54, and fed back corresponding BI；UE9 have selected wave beam B67, and fed back corresponding BI；And UE10 have selected wave beam B72, and Corresponding BI is fed back.Then, the reference letter of base station 3rd level wave beam according to corresponding to the UE wave beams selected send these wave beams Number.Finally, each UE is further according to selecting the testing result of each wave beam the best wave beam of performance, and by the ripple of selected wave beam The feedback of the information such as beam index and CQI, RI and PMI is to base station.As shown in figure 4, in this example, from the 1st grade to the three of 3rd level Secondary wave beam transmission process, base station has 8+6 х 8+8 х 8=120 to the UE wave beam numbers sent altogether, but all candidate's ripples Beam has 512.Therefore, the number for the wave beam that base station need to be sent can be greatly reduced by the beam selection method of this classification, So as to substantially reduce the expense of beam selection process.
In addition, as it was previously stated, in the 5G epoch, by the way that extensive MIMO technology and beam forming technique to be combined and can obtain More antennas and more wave beams are obtained, moreover, the width of wave beam is more and more narrow, so as to realize that being more accurately directed property takes Business.However, narrowing with beam angle, wave beam is influenceed to become big by phase noise, so as to influence the accurate of beam selection Degree and the quality of communication.Therefore, in the multistage wave beam of herein described method, it is desirable to which it is right that higher level's wave beam can cover institute The subordinate's wave beam answered, namely the width of higher level's wave beam are both greater than the width of subordinate's wave beam, and therefore, UE is first from the wave beam of wider width Middle selection, then selected from the wave beam of narrower width, so as to preferably resist phase noise to beam selection accuracy Influence, improve the accuracy of beam selection, and then ensure communication quality.
Further, in order to further resist influence of the phase noise to beam selection accuracy, the application also proposed A kind of beam selection method.In the method, also further to the final choosings of UE after the candidate beam of UE final choices is determined The candidate beam selected enters horizontal phasing control, and the wave beam after adjustment is sent into UE.UE is to the wave beam after phase adjustment After carrying out wave beam detection, the beam index of selected wave beam is fed back into base station again, now, base station can determine the warp of UE selections Cross phase adjustment candidate beam.In the method, by entering horizontal phasing control to the candidate beam that UE is selected, wave beam can be caused UE can be accurately aligned with, so as to avoid influence of the phase noise to beam selection accuracy and communication quality.
Fig. 5 shows the beam selection method described in present application example.As shown in figure 5, this method comprises the following steps：
Step 501：Base station sends the 1st grade of each wave beam to UE.
Step 502：UE carries out wave beam detection, therefrom finds the best wave beam of receptivity as selected wave beam, and The beam index (BI) of selected wave beam is fed back into base station.
Step 503：Base station receives the beam index of UE feedbacks, it is determined that wave beam corresponding to received beam index.
Step 504：Whether wave beam determined by the judgement of base station is K level wave beams, if identified wave beam is not K level ripples Beam, then perform step 505；If identified wave beam is K level wave beams, step 506 is performed.
Step 505：Base station sends each wave beam determined in next stage wave beam corresponding to wave beam to UE, is then back to step Rapid 502.
The implementation method of above-mentioned steps 501~505 can be identical with the implementation method of above-mentioned steps 201~205, herein Do not repeating.
Step 506：The wave beam selected by UE is prolonged respectively clockwise and inverse centered on wave beam selected by UE base station Clockwise rotation running accuracy set in advance s times, is obtained 2s wave beam, wherein, the angle between each two adjacent beams Degree one running accuracy of difference.Wherein, s is natural number.
In this example, above-mentioned running accuracy and number of revolutions s set can according to the width of candidate beam and Angle between neighboring candidate wave beam determines, ensures that each adjacent wave beam in this 2s+1 wave beam only offsets very little Angle, and after skew will not apart from other candidate beams closer to.
Step 507：Base station the wave beam selected by obtained 2s wave beam and UE is issued into UE together.
In this step, base station will send BRS to the UE of 2s+1 wave beam altogether.
Step 508：UE carries out wave beam detection, therefrom finds the best wave beam of receptivity as selected wave beam, and The beam index (BI) of selected wave beam is fed back into base station.
Step 509：Base station receives the beam index of UE feedbacks, it is determined that wave beam corresponding to received beam index.
Step 510：Wave beam of the base station using identified wave beam as UE final choices.
Above-mentioned steps 506-510 realizes the intense adjustment of the phase to selected wave beam, so that selected ripple Beam can more accurately be directed at UE, effectively avoid phase noise to the beam selection degree of accuracy and the influence of communication quality.
Fig. 6 shows the above-mentioned example that phase intense adjustment is carried out to selected wave beam.In the example depicted in fig. 6, it is false If s=2.In this example, the candidate beam B that base station first selects UE212By counterclockwise and rotation one respectively clockwise Running accuracy 2 times, obtain four wave beam B212-2、B212-1And B212+1、B212+2.In this case, base station will send following five Wave beam B212-2、B212-1、B212、B212+1And B212+2BRS to UE.UE is selected after wave beam detection is carried out and has been fed back B212+1。 In this case, base station can determine that wave beam B212+1UE can be more precisely directed at.
As the alternative solution of above-mentioned steps 510, base station can also be further performed such as figure after execution of step 509 Following process shown in 7：
Step 510A, whether the wave beam for determining this determination is the wave beam for rotating obtained most edge, if so, then performing step Rapid 510B；If it is not, then perform step 510C.
Step 510B：Wave beam of the base station using identified wave beam as UE final choices.
Step 510C：Base station is continued centered on the wave beam selected by the UE, and wave beam edge is square clockwise and anticlockwise To continuing to rotate running accuracy set in advance s times, 2s wave beam is obtained, wherein, the angle between each two adjacent beams Differ a running accuracy.Wherein, s is natural number.
Step 510D：Wave beam selected by obtained 2s wave beam and UE is issued UE by base station together, is then back to step 508。
Above-mentioned steps 506-509,510A-510D realize the intense adjustment of the phase to selected wave beam, so that Selected wave beam can more accurately be directed at UE, effectively avoid phase noise to the beam selection degree of accuracy and communication quality Influence.
Fig. 8 a and 8b show the above-mentioned example that phase intense adjustment is carried out to selected wave beam.Shown in Fig. 8 a and 8b In example, it is assumed that s=1.In this example, the candidate beam B that base station first selects UE121By counterclockwise and clockwise direction point Not Xuan Zhuan a running accuracy, obtain 2 wave beam B121-1And B121+1.In this case, as shown in Figure 8 a, base station will be sent 3 wave beam B below121-1、B121And B121+1To UE.UE is selected after wave beam detection is carried out and has been fed back B121+1.In such case Under, base station will continue with wave beam B121+1Centered on counterclockwise and clockwise respectively rotate a running accuracy, obtain 2 wave beams B121And B121+2.In this case, as shown in Figure 8 b, base station will send following 3 wave beam B121、B121+1And B121+2To UE.This When, after wave beam detects, if UE selection wave beams B121+1, then wave beam B121+1For the wave beam of UE final choices.If UE is selected Wave beam B121+2, then base station will be with wave beam B121+2Centered on continue counterclockwise and turn clockwise to obtain new wave beam, and continue to send out Give UE to be selected, until UE finds final wave beam.
Corresponding above-mentioned beam selection method, the example of the application give a kind of base for realizing above-mentioned beam selection method Stand.Fig. 9 shows the internal structure of the base station described in present application example.As shown in figure 9, the base station includes：
Configuration module 901, for carrying out beam selection configuration, the 1st grade is determined to K levels wave beam at different levels and wave beam at different levels Between corresponding relation；Wherein, configured the 1st grade of configuration module 901 to K levels wave beams at different levels to meet it is previously described will Ask；
Beam reference signal transmitting module 902, for sending wave beam reference signal to UE；
Feedback reception module 903, for receiving the beam index of UE feedbacks；
Control module 904, for controlling wave beam reference signal sending module 902 to be configured to UE send configurations module 901 The 1st grade of wave beam beam reference signal；After the beam index that feedback reception module 903 receives UE feedbacks, UE institutes are determined Feed back beam index corresponding to wave beam, and judge the wave beam whether be K levels wave beam, if it is, the wave beam be UE it is final The wave beam of selection；If it is not, then control wave beam reference signal sending module 902 sends next stage ripple corresponding to the wave beam to UE The beam reference signal of beam.
Above-mentioned base station can further include：Phase adjusting module 905, the wave beam for selecting UE carry out phase tune It is whole, and control the beam reference signal of the wave beam after phase adjustment of wave beam reference signal sending module 902；And in feedback reception After module 903 receives the beam index of UE feedbacks, determine that UE feeds back wave beam corresponding to beam index, as UE final choices Wave beam.
Above-mentioned phase adjusting module 905 can use above-mentioned steps 506-510 method or step 506-509,510A- 510D method enters horizontal phasing control.
As described above, the above-mentioned base station for realizing beam selection can substantially reduce wave beam by being classified the method for beam selection The signaling consumption of selection course, and the width of higher level's wave beam by being configured is greater than the width of subordinate's wave beam, therefore, this Scheme can also effectively antagonize phase noise to the beam selection degree of accuracy and the influence of communication quality, namely improve beam selection The degree of accuracy, and then improve system communication quality.
The example of the application is the foregoing is only, it is all in spirit herein and original not to limit the application Within then, any modification, equivalent substitution and improvements done etc., it should be included within the scope of the application protection.

Claims (16)

  1. A kind of 1. beam selection method, it is characterised in that including：
    A, the 1st grade is pre-configured with to the corresponding relation between K levels wave beam and wave beam at different levels；Wherein, K is natural number；
    B, the 1st grade of each wave beam is sent to user terminal UE；
    C, the beam index of UE feedbacks is received；
    D, determine to receive wave beam corresponding to beam index,
    If identified wave beam is not K level wave beams, determined to UE transmissions each in next stage wave beam corresponding to wave beam Wave beam, it is then back to c；
    If identified wave beam is K level wave beams, the candidate beam that identified wave beam is selected as UE.
  2. 2. according to the method for claim 1, it is characterised in that described 1st grade to K level wave beams meets following condition：
    Each wave beam of i-stage corresponds to the wave beam of two and above i+1 level respectively；
    The wave beam of i+1 level corresponds to the wave beam of 1 i-stage；
    Each wave beam of i-stage can correspond to the wave beam of two and above i+1 level respectively；
    K levels wave beam is N number of candidate beam, and N is natural number；And
    The direction of each wave beam of i-stage distinguish the directional correlation of corresponding two and above i+1 level wave beam；Wherein, i =[1, K-1].
  3. 3. method according to claim 1 or 2, it is characterised in that the width of i-stage wave beam is more than i+1 level wave beam Width, wherein, i=[1, K-1].
  4. 4. according to the method for claim 2, it is characterised in that the direction of each wave beam of the i-stage is right with it respectively Two answered and the directional correlation of above i+1 level wave beam include：
    The coefficient correlation of the coefficient of the corresponding i+1 level wave beam of the coefficient of the i-stage wave beam is more than threshold set in advance Value.
  5. 5. according to the method for claim 4, it is characterised in that the coefficient of the wave beam includes the array factor of wave beam.
  6. 6. according to the method for claim 1, it is characterised in that each wave beam that the 1st grade is sent to user terminal UE Including：
    Beam reference signal BRS resource distributions are carried out by radio resource control RRC signaling or dynamic control signaling；And
    The BRS of the 1st grade of each wave beam is sent in the BRS resources of configuration.
  7. 7. according to the method for claim 1, it is characterised in that each wave beam that the 1st grade is sent to user terminal UE Including：
    Beam reference signal BRS resources are configured in radio resource control RRC signaling in advance；
    UE is notified to prepare to receive BRS by dynamic signaling when being ready for sending BRS；And
    The BRS of the 1st grade of each wave beam is sent in the BRS resources of configuration.
  8. 8. according to the method for claim 1, it is characterised in that described sent to UE determines next stage ripple corresponding to wave beam Each wave beam in beam includes：
    Beam reference signal BRS resource distributions are carried out by radio resource control RRC signaling or dynamic control signaling；And
    The BRS of each wave beam of next stage is sent in the BRS resources of configuration.
  9. 9. according to the method for claim 1, it is characterised in that described sent to UE determines next stage ripple corresponding to wave beam Each wave beam in beam includes：
    Beam reference signal BRS resources are configured in radio resource control RRC signaling in advance；
    UE is notified to prepare to receive BRS by dynamic signaling when being ready for sending BRS；And
    The BRS of each wave beam of next stage is sent in the BRS resources of configuration.
  10. 10. the method according to claim 7 or 9, it is characterised in that described to notify UE to prepare to receive by dynamic signaling BRS includes：
    Increase BRS indication bits on the Downlink Control Information DCI relevant with downlink transfer transmitted on down control channel；Its In, the BRS indication bits show that base station will start to send BRS when being 1；
    When being ready for sending BRS, the BRS indication bits are arranged to 1.
  11. 11. according to the method for claim 1, it is characterised in that further comprise：Notify the mould of UE feedback beam index Formula；Wherein, the pattern of the feedback beam index includes：Without feedback；The only beam index of wave beam selected by feedback；And remove Outside the beam index of wave beam selected by feedback, feedback channel quality is also needed to indicate CQI, order instruction RI and pre-coding matrix instruction PMI。
  12. 12. according to the method for claim 11, it is characterised in that the pattern of the notice UE feedbacks beam index includes：
    Increase feedback model indication bit on the DCI relevant with downlink transfer transmitted on down control channel, wherein, it is described Feedback model indication bit shows to be fed back for 0；The feedback model indication bit shows only to need selected by feedback for 1 Select the beam index of wave beam；The feedback model indication bit shows not only to need the beam index for feeding back selected wave beam for 2 Also need to feed back current CQI, RI and PMI.
  13. 13. according to the method for claim 1, it is characterised in that the candidate for selecting identified wave beam as UE Wave beam includes：
    Horizontal phasing control is entered to identified wave beam, sends the beam reference signal of the wave beam after phase adjustment to UE；
    Receive the beam index of UE feedbacks；
    Determine that UE feeds back wave beam corresponding to beam index, the wave beam as UE selections.
  14. 14. according to the method for claim 13, it is characterised in that described that horizontal phasing control bag is entered to identified wave beam Include：
    By centered on determination wave beam, it is set in advance that determined wave beam is prolonged into clockwise and counterclockwise rotation respectively Running accuracy s times, 2s wave beam is obtained, wherein, the angle between each two adjacent beams differs a running accuracy；Its In, s is natural number.
  15. A kind of 15. base station, it is characterised in that including：
    Configuration module, for carrying out beam selection configuration, the 1st grade is determined between K levels wave beam at different levels and wave beam at different levels Corresponding relation；Wherein, K is natural number；
    Beam reference signal transmitting module, for sending wave beam reference signal to user terminal UE；
    Feedback reception module, for receiving the beam index of UE feedbacks；
    Control module, for controlling the 1st grade of wave beam that wave beam reference signal sending module configured to UE send configuration modules Beam reference signal；After the beam index that feedback reception module receives UE feedbacks, it is corresponding to determine that UE feeds back beam index Wave beam, and judge the wave beam whether be K levels wave beam, if it is, the wave beam be UE selection wave beam；If it is not, Then control wave beam reference signal sending module sends the beam reference signal of next stage wave beam corresponding to the wave beam to UE.
  16. 16. base war according to claim 15, it is characterised in that further comprise：
    Phase adjusting module, for entering horizontal phasing control to the wave beam that UE is selected, control wave beam reference signal sending module is sent The beam reference signal of wave beam after phase adjustment；And after the beam index that feedback reception module 903 receives UE feedbacks, Determine that UE feeds back wave beam corresponding to beam index, the wave beam as UE selections.
CN201610801373.8A 2016-09-05 2016-09-05 beam selection method and device Pending CN107800467A (en)

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CN201780043866.2A CN109792277B (en) 2016-09-05 2017-08-08 Beam selection method and device
PCT/CN2017/096357 WO2018040858A1 (en) 2016-09-05 2017-08-08 Method and device for beam selection

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