CN105227281A - Based on pilot distribution method and the device of MIMO - Google Patents

Based on pilot distribution method and the device of MIMO Download PDF

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Publication number
CN105227281A
CN105227281A CN201410314782.6A CN201410314782A CN105227281A CN 105227281 A CN105227281 A CN 105227281A CN 201410314782 A CN201410314782 A CN 201410314782A CN 105227281 A CN105227281 A CN 105227281A
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user terminal
wave beam
weights
matched
described user
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CN105227281B (en
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杨晶
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2015/072233 priority patent/WO2016000451A1/en
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Abstract

The invention provides a kind of pilot distribution method based on MIMO and device, the method comprises: if the sum of demodulated pilot signal DMRS port corresponding to pending sector is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in each first grouping, according to default clocking sequence, wave beam is numbered; Be respectively DMRS port corresponding to each beam allocation in each first grouping; And in the different first grouping, number the same DMRS port of identical beam allocation; Determine the matched beam that on pending sector, each user terminal is corresponding respectively, according to the DMRS port of the DMRS port determination user terminal coupling that matched beam distributes.The embodiment of the present invention has been broken maximum pairing in prior art and, to the restriction of user's number of plies, has effectively been improved demodulation performance.

Description

Based on pilot distribution method and the device of MIMO
Technical field
The embodiment of the present invention relates to the communication technology, particularly relates to a kind of pilot distribution method based on MIMO and device.
Background technology
At present, multiple-input and multiple-output (multiple-inputmultiple-output, be called for short MIMO) be usually divided into single user multiple-input and multiple-output (Single-UserMIMO, be called for short SU-MIMO) and multi-user's multiple-input and multiple-output (Multi-UserMIMO is called for short MU-MIMO) two kinds; Wherein, SU-MIMO refers to the point-to-point antenna link between base station and a user.MU-MIMO refer to several user use identical time-domain and frequency-domain resource simultaneously with a base station communication.Because MU-MIMO can transmit the data flow of multiple space division multiplexing to different users simultaneously, therefore, along with increasing of base station transmit antennas number, the gain of MU-MIMO is particularly evident, for example, the data fluxion of maximum space division multiplexing is MIN (NTx, NMs*NRx), wherein, NTx is that antenna number is sent out in base station, NRx receives antenna number for user, and NMs is the number of users in sector, and MIN gets numerical value minimum in two numbers.It can thus be appreciated that along with increasing of base station transmit antennas number, in order to obtain larger capacity gain, the demand of multiplexing more data fluxion is also stronger, thus the gain causing MU-MIMO is particularly evident.
In addition, in R9 standard, the adaptable quadrature demodulation pilot signal of MU-MIMO (demodulationreferencesignal, being called for short DMRS) port adds up to two (such as, these two ports can be expressed as port7 and port8), also the port sum that can increase DMRS in some schemes is had, as increased to 8.Illustrate for two ports, if two single current user pairings, so allow a user to send DMRS with port7, another user sends DMRS with port8; If two double-current users, user port7 and port8 sends DMRS, and another user also sends DMRS with port7 and port8.
Due to the restriction of existing standard, two pilot frequency port can only limit the maximum number of plies (i.e. data fluxion) of matching user and be no more than at most 4 layers, (2 orthogonal guide frequency port7 and port8, two scramblers on same pilot port), when two double-current users match, although consider that port7 and port8 respectively has two scramblers in addition, but the pilot tone that scrambler is distinguished can not ensure orthogonal, same, if two multiplexing orthogonal guide frequency ports of single current user, the pilot tone that scrambler is distinguished can not ensure orthogonal, therefore, use the interference of DMRS between the user of same pilot port transmission pilot tone very serious simultaneously, thus cause DMRS channel estimating to be forbidden, demodulation performance is deteriorated.
Summary of the invention
The embodiment of the present invention provides a kind of pilot distribution method based on MIMO and device, realizes the spatial reuse of pilot tone, has broken the restriction to the maximum pairing user number of plies in prior art, has effectively improved demodulation performance.
First aspect present invention provides a kind of pilot distribution method based on MIMO, comprising:
If the sum of the demodulated pilot signal DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in each described first grouping, according to described default clocking sequence, wave beam is numbered;
Be respectively DMRS port corresponding to each beam allocation in each described first grouping; Wherein, the DMRS port that the wave beam in each described first grouping is corresponding is all not identical; And in the different first grouping, number the same DMRS port of identical beam allocation;
Determine the matched beam that on described pending sector, each user terminal is corresponding respectively, determine according to the DMRS port that described matched beam distributes the DMRS port that described user terminal mates.
May in implementation in the first of first aspect, described method also comprises: determine that the different user terminals that same described matched beam in same described first grouping is corresponding uses different frequency domain resource.
In conjunction with first aspect, in the second possibility implementation of first aspect, the described matched beam determining that on described pending sector, each user terminal is corresponding respectively, to determine the DMRS port that described user terminal mates, specifically comprises:
For each user terminal on described pending sector, according to the principle preset, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
For each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as the DMRS port of described user terminal coupling.
In conjunction with first aspect, in the third possibility implementation of first aspect, the described matched beam determining that on described pending sector, each user terminal is corresponding respectively, to determine the DMRS port that described user terminal mates, specifically comprises:
For each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal mates, and calculate the cross-correlation coefficient obtaining described first weights second weights corresponding with each wave beam on described pending sector respectively;
According to the cross-correlation coefficient of described first weights of described acquisition second weights corresponding with each wave beam on described pending sector, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
For each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as the DMRS port of described user terminal coupling.
In conjunction with the third possibility implementation of first aspect, in the 4th kind of possibility implementation of first aspect, the cross-correlation coefficient of described second weights corresponding with each wave beam on described pending sector according to described first weights of described acquisition, and the order that described user terminal is corresponding, determine to comprise the matched beam that described user terminal is corresponding:
If the order that described user terminal is corresponding equals 1, determine the matched beam that described user terminal is corresponding, wherein, the cross-correlation coefficient of the second weights that described first weights are corresponding with described matched beam is greater than the cross-correlation coefficient of described first weights second weights corresponding with other wave beams except described matched beam; Or,
If the order that described user terminal is corresponding is greater than 1, according to the order from big to small of described cross-correlation coefficient, using wave beam corresponding for top n cross-correlation coefficient as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and N is more than or equal to 2.
In conjunction with first aspect, in the 5th kind of possibility implementation of first aspect, the described matched beam determining that on described pending sector, each user terminal is corresponding respectively, to determine the DMRS port that described user terminal mates, specifically comprises:
For each user terminal on described pending sector, obtain the averaged channel covariance matrix on Resource Block shared by reference signal that described user terminal is currently received respectively, according to described averaged channel covariance matrix and second weights corresponding with each wave beam on described pending sector of described acquisition, the wave beam that the described user terminal of calculating acquisition is corresponding respectively receives the power corresponding to described reference signal, wave beam corresponding according to described user terminal again receives the power corresponding to described reference signal, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding,
For each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as the DMRS port of described user terminal coupling.
In conjunction with the 5th kind of possibility implementation of first aspect, in the 6th kind of possibility implementation of first aspect, the wave beam corresponding according to described user terminal receives the power corresponding to described reference signal, and the order that described user terminal is corresponding, determine specifically to comprise the matched beam that described user terminal is corresponding:
If the order that described user terminal is corresponding equals 1, the matched beam of described user terminal is one, determine the described matched beam that described user terminal is corresponding, wherein, described matched beam receives and is describedly greater than other wave beam corresponding to described user terminal except described matched beam with reference to the received power corresponding to letter and receives received power corresponding to described reference signal; Or,
If the order that described user terminal is corresponding is greater than 1, the wave beam corresponding to described user terminal receives the received power corresponding to described reference signal, sort according to order from small to large, and using the wave beam of sequence corresponding to the received power of top n as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and is more than or equal to 2.
In conjunction with the third possibility implementation of first aspect, in the 7th kind of possibility implementation of first aspect, for each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal mates, specifically comprise:
For each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal from base station side mates; Wherein, described first weights are the detection reference signal that described base station side sends according to described user terminal, carry out the result that channel estimating obtains channel estimating, and calculate according to the result of described channel estimating the beam shape-endowing weight value obtained; Or described first weights are the pre-coding matrix instruction PMI that described base station side is received described user terminal and reported by precoding mode, and according to the precoding weights that described PMI obtains.
In conjunction with the third possibility implementation of first aspect, in the 8th kind of possibility implementation of first aspect, after the cross-correlation coefficient of the second weights that described first weights of the described acquisition of calculating are respectively corresponding with each wave beam on described pending sector, described method also comprises:
Calculate respectively and obtain the mean value of described cross-correlation coefficient, and according to the mean value of described cross-correlation coefficient, time-domain filtering being carried out to described cross-correlation coefficient;
The then cross-correlation coefficient of described second weights corresponding with each wave beam on described pending sector according to described first weights of described acquisition, and the order that described user terminal is corresponding, determine specifically to comprise the matched beam that described user terminal is corresponding:
According to the cross-correlation coefficient after described time-domain filtering, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding.
In conjunction with the 5th kind of possibility implementation of first aspect, in the 9th kind of possibility implementation of first aspect, according to described averaged channel covariance matrix and second weights corresponding with each wave beam on described pending sector of described acquisition, after the wave beam that the described user terminal of calculating acquisition is corresponding respectively receives the power corresponding to described reference signal, described method also comprises:
The power that the wave beam corresponding to described user terminal receives corresponding to described reference signal carries out time-domain filtering;
Then the described wave beam corresponding according to described user terminal receives the power corresponding to described reference signal, and the order that described user terminal is corresponding, determines specifically to comprise the matched beam that described user terminal is corresponding:
According to the power after described time-domain filtering, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding.
Second aspect present invention provides a kind of pilot distribution device based on MIMO, comprising:
Grouping module, the sum of the demodulated pilot signal DMRS port corresponding for pending sector is less than the sum of wave beam on pending sector, divides into groups to the wave beam on pending sector according to default clocking sequence, obtains at least two first groupings;
Numbering module, for respectively to the wave beam in each described first grouping, is numbered wave beam according to described default clocking sequence;
Port assignment module, for being respectively DMRS port corresponding to each beam allocation in each described first grouping; Wherein, the DMRS port that the wave beam in each described first grouping is corresponding is all not identical; And in the different first grouping, number the same DMRS port of identical beam allocation;
Determination module, for the matched beam determining that on described pending sector, each user terminal is corresponding respectively, determines according to the DMRS port that described matched beam distributes the DMRS port that described user terminal mates.
In the first possibility implementation of second aspect, described determination module comprises:
Matched beam determining unit, for for each user terminal on described pending sector, according to the principle preset, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
Port determining unit, for for each user terminal, is defined as the DMRS port of described user terminal coupling by DMRS port corresponding for the matched beam of correspondence.
In conjunction with second aspect, in the second possibility implementation of second aspect, described determination module comprises:
Weights processing unit, for for each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal mates, and calculate the cross-correlation coefficient obtaining described first weights second weights corresponding with each wave beam on described pending sector respectively;
Matched beam determining unit, for the cross-correlation coefficient of second weights corresponding with each wave beam on described pending sector of described first weights according to described acquisition, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
Port determining unit, for for each user terminal, is defined as the DMRS port of described user terminal coupling by DMRS port corresponding for the matched beam of correspondence.
In conjunction with the second possibility implementation of second aspect, in the third possibility implementation of second aspect, if described matched beam determining unit equals 1 specifically for the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding, wherein, the cross-correlation coefficient of the second weights that described first weights are corresponding with described matched beam is greater than the cross-correlation coefficient of described first weights second weights corresponding with other wave beams except described matched beam; Or,
If described matched beam determining unit is greater than 1 specifically for the order that described user terminal is corresponding, according to the order from big to small of described cross-correlation coefficient, using wave beam corresponding for top n cross-correlation coefficient as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and N is more than or equal to 2.
In conjunction with second aspect, in the 4th kind of possibility implementation of second aspect, described determination module comprises:
Acquiring unit, for for each user terminal on described pending sector, obtain the averaged channel covariance matrix on Resource Block shared by reference signal that described user terminal is currently received respectively, according to described averaged channel covariance matrix and second weights corresponding with each wave beam on described pending sector of described acquisition, the wave beam that the described user terminal of calculating acquisition is corresponding respectively receives the power corresponding to described reference signal;
Matched beam determining unit, receives the power corresponding to described reference signal for the wave beam corresponding according to described user terminal, and the order that described user terminal is corresponding, determines the matched beam that described user terminal is corresponding;
Port determining unit, for for each user terminal, is defined as the DMRS port of described user terminal coupling by DMRS port corresponding for the matched beam of correspondence.
In conjunction with the 4th kind of possibility implementation of second aspect, in the 5th kind of possibility implementation of second aspect, if described matched beam determining unit equals 1 specifically for the order that described user terminal is corresponding, the matched beam of described user terminal is one, determine the described matched beam that described user terminal is corresponding, wherein, described matched beam receives and is describedly greater than other wave beam corresponding to described user terminal except described matched beam with reference to the received power corresponding to letter and receives received power corresponding to described reference signal; Or,
If described matched beam determining unit is greater than 1 specifically for the order that described user terminal is corresponding, the wave beam corresponding to described user terminal receives the received power corresponding to described reference signal, sort according to order from small to large, and using the wave beam of sequence corresponding to the received power of top n as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and is more than or equal to 2.
The second in conjunction with second aspect may implementation, may in implementation at the 6th kind of second aspect, described weights processing unit also for:
For each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal from base station side mates; Wherein, described first weights are the detection reference signal that described base station side sends according to described user terminal, carry out the result that channel estimating obtains channel estimating, and calculate according to the result of described channel estimating the beam shape-endowing weight value obtained; Or described first weights are the pre-coding matrix instruction PMI that described base station side is received described user terminal and reported by precoding mode, and according to the precoding weights that described PMI obtains.
In conjunction with the second possibility implementation of second aspect, in the 7th kind of possibility implementation of second aspect, described weights processing unit also for calculating respectively and obtaining the mean value of described cross-correlation coefficient, and carries out time-domain filtering according to the mean value of described cross-correlation coefficient to described cross-correlation coefficient;
Described matched beam determining unit is also for according to the cross-correlation coefficient after described time-domain filtering, and the order that described user terminal is corresponding, determines the matched beam that described user terminal is corresponding.
In conjunction with the 4th kind of possibility implementation of second aspect, in the 8th kind of possibility implementation of second aspect, the power that described acquiring unit also receives corresponding to described reference signal for the wave beam corresponding to described user terminal carries out time-domain filtering;
Described matched beam determining unit is also for according to filtered power, and the order that described user terminal is corresponding, determines the matched beam that described user terminal is corresponding.
Third aspect present invention provides a kind of base station, comprising: memory, for storing instruction;
Processor, is coupled with described memory, and described processor is configured to perform the instruction stored in which memory, and described processor is configured to for performing the pilot distribution method based on MIMO as described above.
The pilot distribution method based on MIMO that the present embodiment provides and device, if the sum of the DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence to the wave beam grouping on pending sector, obtain at least two first groupings, and respectively to the wave beam in each first grouping, according to default clocking sequence, wave beam is numbered, be respectively DMRS port corresponding to each beam allocation in each first grouping, the DMRS port that wave beam in each first grouping is corresponding is all not identical, and DMRS port corresponding to the wave beam with identical numbering in all first grouping is identical, determine the matched beam that on pending sector, each user terminal is corresponding respectively, by the DMRS port of matched beam determination user terminal coupling, thus realize the spatial reuse of pilot tone, break the restriction to the maximum pairing user number of plies in prior art.Due in all first grouping, number the identical same DMRS port of beam allocation, two user terminals distributing two beam coverage area of identical DMRS port corresponding are spatially distant, so during the multiplexing DMRS port of these two user terminals, interference in pilot tone is not serious, effectively improves demodulation performance.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The flow chart of the pilot distribution method based on MIMO that Fig. 1 provides for the embodiment of the present invention one;
The flow chart of the pilot distribution method based on MIMO that Fig. 2 provides for the embodiment of the present invention two;
The flow chart of the pilot distribution method based on MIMO that Fig. 3 provides for the embodiment of the present invention three;
The flow chart of the pilot distribution method based on MIMO that Fig. 4 provides for the embodiment of the present invention four;
The structural representation of the pilot distribution device based on MIMO that Fig. 5 provides for the embodiment of the present invention five;
The structural representation of the pilot distribution device based on MIMO that Fig. 6 provides for the embodiment of the present invention six;
The structural representation of the pilot distribution device based on MIMO that Fig. 7 provides for the embodiment of the present invention seven;
The structural representation of the pilot distribution device based on MIMO that Fig. 8 provides for the embodiment of the present invention eight;
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The flow chart of the pilot distribution method based on MIMO that Fig. 1 provides for the embodiment of the present invention one, as shown in Figure 1, the method for the present embodiment comprises the steps.
If the sum of the demodulated pilot signal DMRS port that the pending sector of step 101 is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in this first grouping each, according to this default clocking sequence, wave beam is numbered.
In the present embodiment, for example, when the sum of the demodulated pilot signal DMRS port corresponding in pending sector is less than wave beam on pending sector total, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in each first grouping, according to clockwise order, wave beam is numbered.Such as, corresponding 8 DMRS port in pending sector, have 16 wave beams in pending sector, then by these 16 wave beams such as, according to default clocking sequence, clock-wise order, two groups can be divided into, often organizing 8 wave beams, forms two first grouping I and II, is wave beam 1 by the first 8 wave beams divided into groups in I according to clockwise serial number, wave beam 2,8 wave beams in first grouping II are wave beam 1 according to clockwise serial number by wave beam 8, wave beam 2,, wave beam 8.
Optionally, in the present embodiment, also can divide into groups to the wave beam on pending sector according to counterclockwise direction, and each grouping is numbered wave beam wherein according to sequence counter-clockwise.
The DMRS port that step 102, each beam allocation be respectively in this first grouping each are corresponding; Wherein, the DMRS port that the wave beam in this first grouping each is corresponding is all not identical; And in the different first grouping, number the same DMRS port of identical beam allocation.
Such as, there is wave beam 1 and wave beam 2 in the first grouping I, wave beam 1 distributes port7, and wave beam 2 distributes port8; There is wave beam 1 and wave beam 2 in first grouping II, wave beam 1 distributes port7, and wave beam 2 distributes port8, namely numbers the identical DMRS port of two identical beam allocation in two first groupings.Wherein, port7 and port8 is two different DMRS port, for sending demodulated pilot signal.
Step 103, determine the matched beam that on this pending sector, each user terminal is corresponding respectively, determine according to the DMRS port that this matched beam distributes the DMRS port that this user terminal mates.
In the present embodiment, there is multiple user terminal in pending sector, determine the matched beam that each user terminal is corresponding respectively, due to the corresponding DMRS port of each wave beam, therefore, determine and the DMRS port that each user terminal mates by the matched beam that user terminal is corresponding.And, it should be noted that, during multiple different user terminal corresponding to the same matched beam in same region, limit these user terminals and can not share same frequency domain resource, such as, in the first grouping I, there are three user terminals under wave beam 1 overlay area, namely the matched beam of these three user terminals is all wave beam 1, thus these three user terminals are assigned with same DMRS port, serious interference is produced when using same DMRS port to send DMRS to prevent these three user terminals, then limit these three user terminals and use different frequency resources respectively.
Concrete, there to be 16 wave beams in pending sector, the DMRS port (port) that correspondence 8 is different is example, describes the technical scheme of the present embodiment in detail.These 16 wave beams are divided into two groups according to clockwise order, often organize 8 wave beams, form two first grouping I and II, wherein, 8 wave beams of the first grouping I are wave beam 1 according to clockwise order number consecutively, wave beam 2 ..., wave beam 8,8 wave beams of the first grouping II are wave beam 1 according to clockwise order number consecutively, wave beam 2 ..., wave beam 8.8 DMRS port are also numbered, are respectively port7, port8 ..., port14.Be respectively the DMRS port that each beam allocation one of I and first grouping II in the first grouping is corresponding, and, two identical same DMRS port of beam allocation are numbered in first grouping I and first grouping II, the wave beam 1 be in the first grouping I distributes port7, wave beam 2 distributes port8,, wave beam 8 distributes port14; Be that wave beam 1 in the first grouping II distributes port7, wave beam 2 distributes port8 ..., wave beam 8 distributes port14.
Determine the matched beam that each user terminal in pending sector is corresponding, the DMRS port that each user terminal mates is determined according to the matched beam of user, as in the first grouping I, the matched beam of user terminal A is wave beam 1, then the DMRS port of user terminal A coupling is port7, the matched beam of user terminal B is wave beam 2, the DMRS port that then user terminal B mates is port8, by that analogy; The matched beam of the user terminal I in the first grouping II is wave beam 1, then the DMRS port that user terminal I mates is port7, and the matched beam of user terminal J is wave beam 2, then the DMRS port that user terminal J mates is port8, by that analogy.Namely belong in the first grouping I in the user terminal A of wave beam 1 and the first grouping II and belong to the user terminal I space division multiplexing port7 of wave beam 1,, in the first grouping I, belong to the user terminal P space division multiplexing port14 belonging to wave beam 8 in user terminal H and the first grouping II of wave beam 8.
It should be noted that, in the present embodiment in pending sector only with 16 wave beams, corresponding 8 DMRS port, two first are grouped into example to illustrate, but not as limit.
The pilot distribution method based on MIMO that the present embodiment provides, if the sum of the DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence to the wave beam grouping on pending sector, obtain at least two first groupings, and respectively to the wave beam in each first grouping, according to default clocking sequence, wave beam is numbered, be respectively DMRS port corresponding to each beam allocation in each first grouping, the DMRS port that wave beam in each first grouping is corresponding is all not identical, and DMRS port corresponding to the wave beam with identical numbering in all first grouping is identical, determine the matched beam that on pending sector, each user terminal is corresponding respectively, by the DMRS port of matched beam determination user terminal coupling, thus realize the spatial reuse of pilot tone, break the restriction to the maximum pairing user number of plies in prior art.Due in all first grouping, number the identical same DMRS port of beam allocation, two user terminals distributing two beam coverage area of identical DMRS port corresponding are spatially distant, so during the multiplexing DMRS port of these two user terminals, interference in pilot tone is not serious, effectively improves demodulation performance.
The flow chart of the pilot distribution method based on MIMO that Fig. 2 provides for the embodiment of the present invention two.The present embodiment is applied in the scene that there is some wave beams in pending sector.As shown in Figure 2, the method for the present embodiment comprises the steps.
If the sum of the demodulated pilot signal DMRS port that the pending sector of step 201 is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in this first grouping each, according to this default clocking sequence, wave beam is numbered.
The DMRS port that step 202, each beam allocation be respectively in each first grouping are corresponding.
Wherein, the DMRS port that the wave beam in each first grouping is corresponding is all not identical; And in all first grouping, number the same DMRS port of identical beam allocation.
In the present embodiment, step 201 and step 202 are identical with step 102 with the step 101 in above-described embodiment one respectively, repeat no more herein.
In addition, preferably, in step 202., determine that different user terminals corresponding to this matched beam same in this first grouping same uses different frequency domain resource.
Step 203, for each user terminal on pending sector, according to the principle preset, and the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding.
In the present embodiment, for the principle preset for the maximum principle of uplink received power, illustrate this technical scheme, the average uplink received power of each wave beam is determined according to following step in base station:
1) base station receives the uplink detection signal of UE by m wave beam, carries out channel estimating at each antenna port based on uplink detection signal, determines the channel coefficients that each antenna port is corresponding on sub-carriers.Such as, for the jth antenna port that i-th wave beam in m wave beam is corresponding, estimate that the channel coefficients obtained is expressed as h on sub-carrierk i, j, k.
2) base station calculates the average uplink received power of channel coefficients on all antenna ports, all subcarriers of each wave beam.
Such as, the average uplink received power of i-th wave beam
Wherein, N portrepresent the total number of the antenna port that m wave beam is corresponding; N subcarrrepresent the total number of subcarrier.
3) the average uplink received power of each wave beam is carried out filtering by base station in time domain, and correspondingly, time domain counter adds 1.
4) to judge whether time domain counter reaches the window of time-domain filtering long in base station.
If the window that time domain counter does not reach time-domain filtering is long, then base station returns and performs above-mentioned steps 1).
If the window that time domain counter reaches time-domain filtering is long, then using the respective average uplink received power of m wave beam in this time period as m wave beam uplink received power separately.
5) base station is according to the uplink received power order from big to small of m wave beam, sorts to m wave beam, if the order of this user terminal equals 1, then using the matched beam of wave beam maximum for uplink received power as this user terminal; If when the order of user terminal is greater than 1, the order of such as user terminal is 2, i.e. N=2, then matched beam comprises: the 1st wave beam is to M wave beam, wherein, the priority of the i-th wave beam is greater than the priority of the i-th+1 wave beam, and M is integer, and is greater than 1, i is integer, is more than or equal to 1, and is less than M.Concrete, using 1st wave beam of wave beam maximum for cross-correlation coefficient as user terminal, will only be less than 2nd wave beam of wave beam as user terminal of maximum cross-correlation coefficient, by that analogy.
It should be noted that, what receive the uplink detection signal of UE in the present embodiment is wave beam or antenna port, and this antenna port and DMRS port are not identical, if antenna is dual polarized antenna, then the antenna port number that each wave beam is corresponding is 2; If antenna is same polarization antenna, then the antenna port number that each wave beam is corresponding is 1.
Step 204, for each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as user terminal coupling DMRS port.
It should be noted that, in the present embodiment, when the corresponding multiple different user terminal of the same matched beam in same region, limit these user terminals and can not share same frequency domain resource.
In the present embodiment, when the order that user terminal is corresponding is 1, determine the corresponding matched beam of this user terminal, be about to the DMRS port that DMRS port corresponding to corresponding matched beam is defined as user terminal coupling; When the order of user terminal is greater than 1, namely when the matched beam that user terminal is corresponding comprises multiple wave beam, according to the method in step 203, select the matched beam of multiple wave beam as user terminal, and the DMRS port that this multiple wave beam is corresponding respectively is all defined as this user terminal appropriate ports.It should be noted that, when the matched beam that user terminal is corresponding comprises multiple wave beam, when the same DMRS port of the i-th wave beam and jth beam allocation, then j is added 1, if this i-th wave beam and jth wave beam are all assigned with same DMRS port, then repeat this step, till the DMRS port that the corresponding DMRS port of the jth wave beam selected is corresponding with the i-th wave beam is not identical.Wherein, be i+1 when j is initial, and j is integer, is less than M.
The pilot distribution method based on MIMO that the present embodiment provides, if the sum of the DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence to the wave beam grouping on pending sector, obtain at least two first groupings according to the sum of DMRS port corresponding to pending sector, some wave beams on pending sector are divided at least two first groupings, and the wave beam in each first grouping is numbered according to default clocking sequence, be respectively DMRS port corresponding to each beam allocation in each first grouping, from m wave beam, select the maximum wave beam of uplink received power as the matched beam of user terminal by base station, by the DMRS port of matched beam determination user terminal coupling, the spatial character of user terminal can be made full use of, the optimization wave beam formed multiple beam weighting is made more to meet the spatial character of user terminal like this.
The flow chart of the pilot distribution method based on MIMO that Fig. 3 provides for the embodiment of the present invention three.The present embodiment is applied in the scene of non-Beam Domain, judges the matched beam of user terminal by calculating weights correlation.As shown in Figure 3, the method for the present embodiment comprises the steps.
If the sum of the demodulated pilot signal DMRS port that the pending sector of step 301 is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in this first grouping each, according to this default clocking sequence, wave beam is numbered.
The DMRS port that step 302, each beam allocation be respectively in each first grouping are corresponding.
Wherein, the DMRS port that the wave beam in each first grouping is corresponding is all not identical; And in all first grouping, number the same DMRS port of identical beam allocation.
In the present embodiment, step 301 and step 302 are identical with step 102 with the step 101 in above-described embodiment one respectively, repeat no more herein.
In addition, preferably, in step 302, determine that different user terminals corresponding to this matched beam same in this first grouping same uses different frequency domain resource.
Step 303, for each user terminal on pending sector, obtain the first weights that the current channel information of user terminal mates.
The cross-correlation coefficient of step 304, respectively the second weights that calculating acquisition first weights are corresponding with each wave beam on pending sector.
Step 305, cross-correlation coefficient according to the first weights second weights corresponding with each wave beam on pending sector obtained, and the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding.
Preferably, in the present embodiment, according to the cross-correlation coefficient of the first weights second weights corresponding with each wave beam on pending sector obtained, and the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding, specifically comprise: if order corresponding to user terminal equals 1, determine the matched beam that user terminal is corresponding, wherein, the cross-correlation coefficient of the second weights that the first weights are corresponding with matched beam is greater than the cross-correlation coefficient of the first weights second weights corresponding with other wave beams except matched beam; Or the order that described user terminal is corresponding is greater than 1, according to the order from big to small of cross-correlation coefficient, using wave beam corresponding for mutual for top n coefficient as matched beam corresponding to user terminal; Wherein, N is positive integer, and N is more than or equal to 2.
Step 306, for each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as user terminal coupling DMRS port.
It should be noted that, in the present embodiment, when the corresponding multiple different user terminal of the same matched beam in same region, limit these user terminals and can not share same frequency domain resource.
Concrete, there to be 16 wave beams in pending sector, the order of this user terminal is 1 is example, describes the technical scheme of the present embodiment in detail.Each wave beam for these 16 wave beams in advance arranges fixing weights, the second weights W that namely each wave beam is corresponding m, m refers to m wave beam, W mbe the second weights that m wave beam is corresponding.Beam shaping (BeamForming the be called for short BF) weights of user terminal in moment t i-th Resource Block group (ResourceBlockGroup is called for short RBG) are W bF, i.e. the first weights, W bFthe vector of 1x16, according to formula calculate W respectively bFand the cross-correlation coefficient between 16 preset weights, obtains the cross-correlation coefficient C that 16 wave beams are corresponding 1(t, i), C 2(t, i) ..., C 16(t, i), the wave beam selecting cross-correlation coefficient maximum is the matched beam of user terminal, and the DMRS port that matched beam is corresponding is the DMRS port of this user terminal coupling.
When the order of user terminal is greater than 1, the order of such as user terminal is 2, i.e. N=2, then matched beam comprises: the 1st wave beam is to M wave beam, wherein, the priority of the i-th wave beam is greater than the priority of the i-th+1 wave beam, and M is integer, and is greater than 1, i is integer, is more than or equal to 1, and is less than M.Concrete, using 1st wave beam of wave beam maximum for cross-correlation coefficient as user terminal, will only be less than 2nd wave beam of wave beam as user terminal of maximum cross-correlation coefficient, by that analogy.It should be noted that, when the same DMRS port of the i-th wave beam and jth beam allocation, then j is added 1, if this i-th wave beam and jth wave beam are all assigned with same DMRS port, then repeat this step, till the DMRS port that the corresponding DMRS port of the jth wave beam selected is corresponding with the i-th wave beam is not identical.Wherein, be i+1 when j is initial, and j is integer, is less than M.
Preferably, in the present embodiment three, step 303 specifically comprises: for each user terminal on described pending sector, obtains from base station side the first weights that this user terminal mates at current channel information; Wherein, the first weights are the detection reference signal that base station side sends according to user terminal, carry out the result that channel estimating obtains channel estimating, and calculate according to the result of channel estimating the BF weights obtained; Or the first weights are the pre-coding matrix instruction (PrecodingMatrixIndicator is called for short PMI) that base station side reception user terminal is reported by precoding mode, and according to the precoding weights that PMI obtains.
In the present embodiment, antenna does not determine some fixing wave beams by some capability-mode (mode as AAS weighting) performance, but detection (sounding) signal of base station side is sent to according to user terminal, do channel estimating in base station side and calculate the BF weighing vector with user terminal transient channel information matches according to the result of channel estimating, or report PMI by terminal to base station by the mode of precoding (precoding), base station obtains weighing vector according to PMI, by adding this instantaneous BF or precoding weights, also form a wave beam adapted with user's space characteristic, and these wave beams change constantly.
Further, on the basis of the present embodiment three, after the step 304, the method can also comprise the steps (not shown): calculate respectively and obtain the mean value of cross-correlation coefficient, and carrying out time-domain filtering according to the mean value of cross-correlation coefficient to cross-correlation coefficient; Then according to the cross-correlation coefficient of the first weights second weights corresponding with each wave beam on pending sector obtained, and the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding, specifically comprise: according to the cross-correlation coefficient after time-domain filtering, and the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding.
Concrete, in the present embodiment, still to have 16 wave beams in pending sector to describe this technical scheme in detail.Obtain the cross-correlation coefficient C that 16 wave beams are corresponding 1(t, i), C 2(t, i) ..., C 16after (t, i), calculate the mean value of moment t user terminal cross-correlation coefficient of all RBG in the sounding bandwidth of current renewal respectively the mean value of the cross-correlation coefficient on m wave beam is wherein N is the RBG sum that each user of moment t upgrades in sounding bandwidth.Cross-correlation coefficient on each user wave beam m also needs to do time domain α filtering, filter window is 200ms, α=0.1, then according to the filtered cross-correlation coefficient of time domain α, and the order of the correspondence of user terminal, determine the matched beam of user terminal.
The pilot distribution method based on MIMO that the present embodiment provides, in non-Beam Domain, if the sum of the demodulated pilot signal DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, be respectively DMRS port corresponding to each beam allocation in each first grouping, the DMRS port that wave beam in each first grouping is corresponding is all not identical, by calculating the cross-correlation coefficient of acquisition first weights second weights corresponding with each wave beam on pending sector, the matched beam that user terminal is corresponding is determined according to cross-correlation coefficient and order corresponding to user terminal, eventually through the DMRS port of matched beam determination user terminal coupling, thus realize the spatial reuse of pilot tone, break the restriction to the maximum pairing user number of plies in prior art.Due in all first grouping, number the identical same DMRS port of beam allocation, namely two user terminals distributing two beam coverage area of identical DMRS port corresponding are spatially distant, so during the multiplexing DMRS port of these two user terminals, interference in pilot tone is not serious, effectively improve demodulation performance, and, calculate in the present embodiment and obtain the mean value of cross-correlation coefficient, and according to the mean value of cross-correlation coefficient, time-domain filtering is carried out to cross-correlation coefficient, make cross-correlation coefficient more steady, be conducive to the matched beam determining that user terminal is corresponding.
The flow chart of the pilot distribution method based on MIMO that Fig. 4 provides for the embodiment of the present invention four.The present embodiment is applied in the scene of non-Beam Domain, judges matched beam by the Reference Signal Received Power (ReferenceSignalReceivingPower is called for short RSRP) calculating user terminal.As shown in Figure 4, the method for the present embodiment comprises the steps.
If the sum of the demodulated pilot signal DMRS port that the pending sector of step 401 is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in this first grouping each, according to this default clocking sequence, wave beam is numbered.
The DMRS port that step 402, each beam allocation be respectively in each first grouping are corresponding.
Wherein, the DMRS port that the wave beam in each first grouping is corresponding is all not identical; And in all first grouping, number the same DMRS port of identical beam allocation.
In the present embodiment, step 401 and step 402 are identical with step 102 with the step 101 in above-described embodiment one respectively, repeat no more herein.
In addition, preferably, in step 402, determine that different user terminals corresponding to this matched beam same in this first grouping same uses different frequency domain resource.
Step 403, for each user terminal on pending sector, obtain the averaged channel covariance matrix on Resource Block shared by the reference signal that is currently received of user terminal respectively.
Step 404, according to this averaged channel covariance matrix of this acquisition and second weights corresponding with each wave beam on this pending sector, calculate respectively and obtain wave beam corresponding to this user terminal and receive power corresponding to this reference signal.
Step 405, the wave beam corresponding according to this user terminal receive the power corresponding to this reference signal, and the order that this user terminal is corresponding, determine the matched beam that this user terminal is corresponding.
Preferably, in the present embodiment, the wave beam corresponding according to user terminal receives the power corresponding to this reference signal, and the order that user terminal is corresponding, determine specifically to comprise the matched beam that user terminal is corresponding: if order corresponding to user terminal equals 1, determine the matched beam that user terminal is corresponding, wherein, the Reference Signal Received Power that matched beam is corresponding is greater than the power of reference signal corresponding to other wave beam except matched beam; Or, if the order that user terminal is corresponding is greater than 1, the wave beam corresponding to this user terminal receives the received power corresponding to this reference signal, sorts according to order from small to large, and using the wave beam of sequence corresponding to the received power of top n as matched beam corresponding to this user terminal; Wherein, N is positive integer, and is more than or equal to 2.
Step 406, for each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as user terminal coupling DMRS port.
It should be noted that, in the present embodiment, when the corresponding multiple different user terminal of the same matched beam in same region, limit these user terminals and can not share same frequency domain resource.
Concrete, there to be 16 wave beams in pending sector, the order of this user terminal is 1 is example, describes the technical scheme of the present embodiment in detail.Each wave beam for these 16 wave beams in advance arranges fixing weights, the second weights W that namely each wave beam is corresponding m, m refers to m wave beam, W mbe the second weights that m wave beam is corresponding.Measured by up sounding and can obtain Resource Block (ResourceBlock shared by each sounding signal of all user terminals in pending sector, be called for short RB) on channel covariance matrices R, then the averaged channel covariance matrix in all sounding bandwidth of current time t wherein N represents the sounding total number of sub-carriers in all sounding bandwidth of moment t.Suppose that the second weights that 16 wave beams are corresponding are respectively W 1, W 2..., W 16, W ifor the weights on wave beam i, be the vector of 16x1, then moment t, the RSRP on i-th wave beam is dMRS port corresponding for the matched beam of correspondence as the matched beam of user terminal, and is defined as the DMRS port of user terminal coupling by the wave beam selecting RSRP maximum.
When the order that user terminal is corresponding is greater than 1, the order of such as user terminal is 2, i.e. N=2, then matched beam comprises: the 1st wave beam is to M wave beam, wherein, the priority of the i-th wave beam is greater than the priority of the i-th+1 wave beam, and M is integer, and is greater than 1, i is integer, is more than or equal to 1, and is less than M.Concrete, using 1st wave beam of wave beam maximum for RSRP as user terminal, will only be less than 2nd wave beam of wave beam as user terminal of RSRP, by that analogy.It should be noted that, when the same DMRS port of the i-th wave beam and jth beam allocation, then j is added 1, if this i-th wave beam and jth wave beam are all assigned with same DMRS port, then repeat this step, till the DMRS port that the corresponding DMRS port of the jth wave beam selected is corresponding with the i-th wave beam is not identical.Wherein, be i+1 when j is initial, and j is integer, is less than M.
Preferably, on the basis of the present embodiment three, after step 404, the method also comprises: carry out time-domain filtering to RSRP, then corresponding according to this user terminal wave beam receives the power corresponding to this reference signal, and the order that this user terminal is corresponding, determine the matched beam that this user terminal is corresponding, specifically comprise: according to this filtered power, and the order that this user terminal is corresponding, determine the matched beam that this user terminal is corresponding.
In the present embodiment, getting the RSRP on i-th wave beam be afterwards, the RSRP on each user wave beam i also needs to do time domain α filtering, RSRP ' i(t)=(1-α) RSRP i(t-1)+α RSRP it (), filter window is 200ms, α=0.1, then according to filtered power and order corresponding to user terminal, determines the matched beam that user terminal is corresponding.
The pilot distribution method based on MIMO that the present embodiment provides, in non-Beam Domain, if the sum of the demodulated pilot signal DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, be respectively DMRS port corresponding to each beam allocation in each first grouping, the DMRS port that wave beam in each first grouping is corresponding is all not identical, by calculating and getting Reference Signal Received Power, and the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding, eventually through the DMRS port of matched beam determination user terminal coupling, thus to have broken in prior art maximum pairing to the restriction of user's number of plies, realize the spatial reuse of pilot tone, due in all first grouping, number the identical same DMRS port of beam allocation, namely two user terminals distributing two beam coverage area of identical DMRS port corresponding are spatially distant, so during the multiplexing DMRS port of these two user terminals, interference in pilot tone is not serious, effectively improve demodulation performance, and, in the present embodiment, time-domain filtering is carried out to RSRP, make the characteristic of RSRP more steady, be conducive to the matched beam determining that user terminal is corresponding.
The structural representation of the pilot distribution device based on MIMO that Fig. 5 provides for the embodiment of the present invention five, as shown in Figure 5, this device comprises: grouping module 11, numbering module 12, port assignment module 13 and determination module 14.Wherein, the sum of the demodulated pilot signal DMRS port that grouping module 11 is corresponding for pending sector is less than the sum of wave beam on pending sector, divides into groups to the wave beam on pending sector according to default clocking sequence, obtains at least two first groupings.Numbering module 12, for respectively to the wave beam in this first grouping each, is numbered wave beam according to this default clocking sequence.Port assignment module 13 is for being respectively DMRS port corresponding to each beam allocation in this first grouping each; Wherein, the DMRS port that the wave beam in this first grouping each is corresponding is all not identical; And in the different first grouping, number the same DMRS port of identical beam allocation.The matched beam of determination module 14 for determining that on this pending sector, each user terminal is corresponding respectively, determines according to the DMRS port that this matched beam distributes the DMRS port that this user terminal mates.
The device of the present embodiment can perform the technical scheme of embodiment of the method shown in Fig. 1, and it realizes principle and beneficial effect is similar, repeats no more herein.
The structural representation of the pilot distribution device based on MIMO that Fig. 6 provides for the embodiment of the present invention six.On the basis of embodiment described in above-mentioned Fig. 5, as shown in Figure 6, determination module 14 comprises: matched beam determining unit 21 and port determining unit 22.Wherein, matched beam determining unit 21, for for each user terminal on pending sector, according to the principle preset, and the order that user terminal is corresponding, determines the matched beam that user terminal is corresponding.DMRS port corresponding for the matched beam of correspondence, for for each user terminal, is defined as the DMRS port of user terminal coupling by port determining unit 22.
The device of the present embodiment can perform the technical scheme of embodiment of the method shown in Fig. 2, and it realizes principle and beneficial effect is similar, repeats no more herein.
The structural representation of the pilot distribution device based on MIMO that Fig. 7 embodiment of the present invention seven provides.On the basis of embodiment described in above-mentioned Fig. 5, as shown in Figure 7, determination module 14 comprises: weights processing unit 31, matched beam determining unit 32 and port determining unit 33.Wherein, weights processing unit 31 is for for each user terminal on this pending sector, the first weights that the current channel information obtaining this user terminal mates, and calculate the cross-correlation coefficient obtaining these first weights second weights corresponding with each wave beam on this pending sector respectively.Matched beam determining unit 32 is for the cross-correlation coefficient according to the first weights second weights corresponding with each wave beam on pending sector obtained, and the order that user terminal is corresponding, determines the matched beam that user terminal is corresponding.DMRS port corresponding for the matched beam of correspondence, for for each user terminal, is defined as the DMRS port of user terminal coupling by port determining unit 33.
Preferably, if matched beam determining unit 32 equals 1 specifically for the order that user terminal is corresponding, determine the matched beam that user terminal is corresponding, wherein, the cross-correlation coefficient of the second weights that the first weights are corresponding with matched beam is greater than the cross-correlation coefficient of the first weights second weights corresponding with other wave beams except matched beam; Or, if matched beam determining unit 32 is greater than 1 specifically for the order that user terminal is corresponding, according to the order from big to small of cross-correlation coefficient, using wave beam corresponding for top n cross-correlation coefficient as matched beam corresponding to user terminal; Wherein, N is positive integer, and N is more than or equal to 2.
Preferably, weights processing unit 31, also for for each user terminal on pending sector, obtains from base station side the first weights that user terminal mates at current channel information; Wherein, the first weights are the detection reference signal that base station side sends according to user terminal, carry out the result that channel estimating obtains channel estimating, and calculate according to the result of channel estimating the beam shape-endowing weight value obtained; Or the first weights are the pre-coding matrix instruction PMI that base station side reception user terminal is reported by precoding mode, and according to the precoding weights that PMI obtains.
Preferably, weights processing unit 31 also for calculating respectively and obtaining the mean value of cross-correlation coefficient, and carries out time-domain filtering according to the mean value of cross-correlation coefficient to cross-correlation coefficient.Matched beam determining unit 32 is also for according to the cross-correlation coefficient after time-domain filtering, and the order that user terminal is corresponding, determines the matched beam that user terminal is corresponding.
The device of the present embodiment can perform the technical scheme of embodiment of the method shown in Fig. 3, and it realizes principle and beneficial effect is similar, repeats no more herein.
The structural representation of the pilot distribution device based on MIMO that Fig. 8 embodiment of the present invention eight provides.On the basis of embodiment described in above-mentioned Fig. 5, as shown in Figure 8, determination module 14 comprises: acquiring unit 41, matched beam determining unit 42 and port determining unit 43.Wherein, acquiring unit 41 is for for each user terminal on this pending sector, obtain the averaged channel covariance matrix on Resource Block shared by reference signal that this user terminal is currently received respectively, according to this averaged channel covariance matrix and second weights corresponding with each wave beam on this pending sector of this acquisition, the wave beam that this user terminal of calculating acquisition is corresponding respectively receives the power corresponding to this reference signal.Matched beam determining unit 42 receives the power corresponding to this reference signal for the wave beam corresponding according to this user terminal, and the order that this user terminal is corresponding, determines the matched beam that this user terminal is corresponding.DMRS port corresponding for the matched beam of correspondence, for for each user terminal, is defined as the DMRS port of user terminal coupling by port determining unit 43.
Preferably, if matched beam determining unit 42 equals 1 specifically for the order that user terminal is corresponding, if the order that this user terminal is corresponding equals 1, the matched beam of this user terminal is one, determine this matched beam that this user terminal is corresponding, wherein, this matched beam received power received corresponding to this reference letter is greater than other wave beam corresponding to this user terminal except this matched beam and receives received power corresponding to this reference signal; Or, if matched beam determining unit 42 is greater than 1 specifically for the order that user terminal is corresponding, the wave beam corresponding to this user terminal receives the received power corresponding to this reference signal, sort according to order from small to large, and using the wave beam of sequence corresponding to the received power of top n as matched beam corresponding to this user terminal; Wherein, N is positive integer, and is more than or equal to 2.
Preferably, the power that acquiring unit 41 also receives corresponding to this reference signal for the wave beam corresponding to this user terminal carries out time-domain filtering.Matched beam determining unit 42 is also for according to filtered power, and the order that user terminal is corresponding, determines the matched beam that user terminal is corresponding.
The device of the present embodiment can perform the technical scheme of embodiment of the method shown in Fig. 4, and it realizes principle and beneficial effect is similar, repeats no more herein.
Present invention also offers a kind of base station, comprise memory and processor, wherein, memory is for storing instruction; Processor, be coupled with this memory, this processor is configured to perform the instruction stored in which memory, and this processor is configured to for performing the arbitrary described pilot distribution method based on MIMO of above-mentioned Fig. 1 to Fig. 4, it is similar that it realizes principle, repeats no more herein.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (20)

1. based on a pilot distribution method of MIMO, it is characterized in that, comprising:
If the sum of the demodulated pilot signal DMRS port that pending sector is corresponding is less than the sum of wave beam on pending sector, according to default clocking sequence, the wave beam on pending sector is divided into groups, obtain at least two first groupings, and respectively to the wave beam in each described first grouping, according to described default clocking sequence, wave beam is numbered;
Be respectively DMRS port corresponding to each beam allocation in each described first grouping; Wherein, the DMRS port that the wave beam in each described first grouping is corresponding is all not identical; And in the different first grouping, number the same DMRS port of identical beam allocation;
Determine the matched beam that on described pending sector, each user terminal is corresponding respectively, determine according to the DMRS port that described matched beam distributes the DMRS port that described user terminal mates.
2. method according to claim 1, is characterized in that, described method also comprises: determine that different user terminals corresponding to same described matched beam in same described first grouping uses different frequency domain resource.
3. method according to claim 1, is characterized in that, the described matched beam determining that on described pending sector, each user terminal is corresponding respectively, to determine the DMRS port that described user terminal mates, specifically comprises:
For each user terminal on described pending sector, according to the principle preset, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
For each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as the DMRS port of described user terminal coupling.
4. method according to claim 1, is characterized in that, the described matched beam determining that on described pending sector, each user terminal is corresponding respectively, to determine the DMRS port that described user terminal mates, specifically comprises:
For each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal mates, and calculate the cross-correlation coefficient obtaining described first weights second weights corresponding with each wave beam on described pending sector respectively;
According to the cross-correlation coefficient of described first weights of described acquisition second weights corresponding with each wave beam on described pending sector, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
For each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as the DMRS port of described user terminal coupling.
5. method according to claim 4, it is characterized in that, the cross-correlation coefficient of described second weights corresponding with each wave beam on described pending sector according to described first weights of described acquisition, and the order that described user terminal is corresponding, determine to comprise the matched beam that described user terminal is corresponding:
If the order that described user terminal is corresponding equals 1, determine the matched beam that described user terminal is corresponding, wherein, the cross-correlation coefficient of the second weights that described first weights are corresponding with described matched beam is greater than the cross-correlation coefficient of described first weights second weights corresponding with other wave beams except described matched beam; Or,
If the order that described user terminal is corresponding is greater than 1, according to the order from big to small of described cross-correlation coefficient, using wave beam corresponding for top n cross-correlation coefficient as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and N is more than or equal to 2.
6. method according to claim 1, is characterized in that, the described matched beam determining that on described pending sector, each user terminal is corresponding respectively, to determine the DMRS port that described user terminal mates, specifically comprises:
For each user terminal on described pending sector, obtain the averaged channel covariance matrix on Resource Block shared by reference signal that described user terminal is currently received respectively, according to described averaged channel covariance matrix and second weights corresponding with each wave beam on described pending sector of described acquisition, the wave beam that the described user terminal of calculating acquisition is corresponding respectively receives the power corresponding to described reference signal, wave beam corresponding according to described user terminal again receives the power corresponding to described reference signal, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding,
For each user terminal, DMRS port corresponding for the matched beam of correspondence is defined as the DMRS port of described user terminal coupling.
7. method according to claim 6, is characterized in that, the wave beam corresponding according to described user terminal receives the power corresponding to described reference signal, and the order that described user terminal is corresponding, determines specifically to comprise the matched beam that described user terminal is corresponding:
If the order that described user terminal is corresponding equals 1, the matched beam of described user terminal is one, determine the described matched beam that described user terminal is corresponding, wherein, described matched beam receives and is describedly greater than other wave beam corresponding to described user terminal except described matched beam with reference to the received power corresponding to letter and receives received power corresponding to described reference signal; Or,
If the order that described user terminal is corresponding is greater than 1, the wave beam corresponding to described user terminal receives the received power corresponding to described reference signal, sort according to order from small to large, and using the wave beam of sequence corresponding to the received power of top n as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and is more than or equal to 2.
8. method according to claim 4, is characterized in that, for each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal mates, specifically comprise:
For each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal from base station side mates; Wherein, described first weights are the detection reference signal that described base station side sends according to described user terminal, carry out the result that channel estimating obtains channel estimating, and calculate according to the result of described channel estimating the beam shape-endowing weight value obtained; Or described first weights are the pre-coding matrix instruction PMI that described base station side is received described user terminal and reported by precoding mode, and according to the precoding weights that described PMI obtains.
9. method according to claim 4, is characterized in that, after the cross-correlation coefficient of the second weights that described first weights of the described acquisition of calculating are respectively corresponding with each wave beam on described pending sector, described method also comprises:
Calculate respectively and obtain the mean value of described cross-correlation coefficient, and according to the mean value of described cross-correlation coefficient, time-domain filtering being carried out to described cross-correlation coefficient;
The then cross-correlation coefficient of described second weights corresponding with each wave beam on described pending sector according to described first weights of described acquisition, and the order that described user terminal is corresponding, determine specifically to comprise the matched beam that described user terminal is corresponding:
According to the cross-correlation coefficient after described time-domain filtering, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding.
10. method according to claim 6, it is characterized in that, according to described averaged channel covariance matrix and second weights corresponding with each wave beam on described pending sector of described acquisition, after the wave beam that the described user terminal of calculating acquisition is corresponding respectively receives the power corresponding to described reference signal, described method also comprises:
The power that the wave beam corresponding to described user terminal receives corresponding to described reference signal carries out time-domain filtering;
Then the described wave beam corresponding according to described user terminal receives the power corresponding to described reference signal, and the order that described user terminal is corresponding, determines specifically to comprise the matched beam that described user terminal is corresponding:
According to the power after described time-domain filtering, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding.
11. 1 kinds based on the pilot distribution device of MIMO, is characterized in that, comprising:
Grouping module, the sum of the demodulated pilot signal DMRS port corresponding for pending sector is less than the sum of wave beam on pending sector, divides into groups to the wave beam on pending sector according to default clocking sequence, obtains at least two first groupings;
Numbering module, for respectively to the wave beam in each described first grouping, is numbered wave beam according to described default clocking sequence;
Port assignment module, for being respectively DMRS port corresponding to each beam allocation in each described first grouping; Wherein, the DMRS port that the wave beam in each described first grouping is corresponding is all not identical; And in the different first grouping, number the same DMRS port of identical beam allocation;
Determination module, for the matched beam determining that on described pending sector, each user terminal is corresponding respectively, determines according to the DMRS port that described matched beam distributes the DMRS port that described user terminal mates.
12. devices according to claim 11, is characterized in that, described determination module comprises:
Matched beam determining unit, for for each user terminal on described pending sector, according to the principle preset, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
Port determining unit, for for each user terminal, is defined as the DMRS port of described user terminal coupling by DMRS port corresponding for the matched beam of correspondence.
13. devices according to claim 11, is characterized in that, described determination module comprises:
Weights processing unit, for for each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal mates, and calculate the cross-correlation coefficient obtaining described first weights second weights corresponding with each wave beam on described pending sector respectively;
Matched beam determining unit, for the cross-correlation coefficient of second weights corresponding with each wave beam on described pending sector of described first weights according to described acquisition, and the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding;
Port determining unit, for for each user terminal, is defined as the DMRS port of described user terminal coupling by DMRS port corresponding for the matched beam of correspondence.
14. devices according to claim 13, it is characterized in that, if described matched beam determining unit equals 1 specifically for the order that described user terminal is corresponding, determine the matched beam that described user terminal is corresponding, wherein, the cross-correlation coefficient of the second weights that described first weights are corresponding with described matched beam is greater than the cross-correlation coefficient of described first weights second weights corresponding with other wave beams except described matched beam; Or,
If described matched beam determining unit is greater than 1 specifically for the order that described user terminal is corresponding, according to the order from big to small of described cross-correlation coefficient, using wave beam corresponding for top n cross-correlation coefficient as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and N is more than or equal to 2.
15. devices according to claim 11, is characterized in that, described determination module comprises:
Acquiring unit, for for each user terminal on described pending sector, obtain the averaged channel covariance matrix on Resource Block shared by reference signal that described user terminal is currently received respectively, according to described averaged channel covariance matrix and second weights corresponding with each wave beam on described pending sector of described acquisition, the wave beam that the described user terminal of calculating acquisition is corresponding respectively receives the power corresponding to described reference signal;
Matched beam determining unit, receives the power corresponding to described reference signal for the wave beam corresponding according to described user terminal, and the order that described user terminal is corresponding, determines the matched beam that described user terminal is corresponding;
Port determining unit, for for each user terminal, is defined as the DMRS port of described user terminal coupling by DMRS port corresponding for the matched beam of correspondence.
16. devices according to claim 15, it is characterized in that, if described matched beam determining unit equals 1 specifically for the order that described user terminal is corresponding, the matched beam of described user terminal is one, determine the described matched beam that described user terminal is corresponding, wherein, described matched beam receives and is describedly greater than other wave beam corresponding to described user terminal except described matched beam with reference to the received power corresponding to letter and receives received power corresponding to described reference signal; Or,
If described matched beam determining unit is greater than 1 specifically for the order that described user terminal is corresponding, the wave beam corresponding to described user terminal receives the received power corresponding to described reference signal, sort according to order from small to large, and using the wave beam of sequence corresponding to the received power of top n as matched beam corresponding to described user terminal;
Wherein, N is positive integer, and is more than or equal to 2.
17. devices according to claim 13, is characterized in that, described weights processing unit also for:
For each user terminal on described pending sector, the first weights that the current channel information obtaining described user terminal from base station side mates; Wherein, described first weights are the detection reference signal that described base station side sends according to described user terminal, carry out the result that channel estimating obtains channel estimating, and calculate according to the result of described channel estimating the beam shape-endowing weight value obtained; Or described first weights are the pre-coding matrix instruction PMI that described base station side is received described user terminal and reported by precoding mode, and according to the precoding weights that described PMI obtains.
18. devices according to claim 13, is characterized in that, described weights processing unit also for calculating respectively and obtaining the mean value of described cross-correlation coefficient, and carries out time-domain filtering according to the mean value of described cross-correlation coefficient to described cross-correlation coefficient;
Described matched beam determining unit is also for according to the cross-correlation coefficient after described time-domain filtering, and the order that described user terminal is corresponding, determines the matched beam that described user terminal is corresponding.
19. devices according to claim 15, is characterized in that, the power that described acquiring unit also receives corresponding to described reference signal for the wave beam corresponding to described user terminal carries out time-domain filtering;
Described matched beam determining unit is also for according to filtered power, and the order that described user terminal is corresponding, determines the matched beam that described user terminal is corresponding.
20. 1 kinds of base stations, is characterized in that, comprising: memory, for storing instruction;
Processor, is coupled with described memory, and described processor is configured to perform and stores instruction in which memory, and described processor be configured to for perform as arbitrary in claim 1 to 10 as described in the pilot distribution method based on MIMO.
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