CN101932096A - Method and system for notifying layer mapping information under multi-user multiple input multiple output mode - Google Patents
Method and system for notifying layer mapping information under multi-user multiple input multiple output mode Download PDFInfo
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Abstract
The invention discloses a method and a system for notifying layer mapping information under a multi-user multiple input multiple output (MU-MIMO) mode. The method comprises that: a transmitting party allocates orthogonal DMRS for a group of receiving parties which are paired to perform MU-MIMO transmission under an MU-MIMO transmission mode, wherein the port number of the used DMRS on resources which are allocated to the group of receiving parties is the sum of layers respectively used by each receiving party; or, the transmitting party shares the DMRS for the group of receiving parties which are paired to perform MU-MIMO transmission, and determines the port number of the DMRS according to the layer number of the receiving party with the most using layers; and for each receiving party in the group of receiving parties, the transmitting party notifies the mapping mode information from the code word stream to the layer of the receiving party to the receiving party. The method and the system for notifying layer mapping information under the MU-MIMO mode can solve the problem of data solution mapping problem because of UE does not know the presence of pilot frequency of other layers, and improve the user data detection performance.
Description
Technical field
The present invention relates in a kind of LTE-A system, under multi-user's multiple-input and multiple-output (multi-user multiple input multiple output is abbreviated as MU-MIMO) pattern, the Notification Method and the system of layer map information.
Background technology
Current, among the LTE-A, in order to reduce the expense of pilot tone, pilot tone is divided into channel measurement pilot frequency (CSI-RS:channel state information-reference signal) and demodulation pilot frequency (DMRS:demodulation reference signal) designing two portions, according to current design hypothesis, the baseline of DMRS and CSI-RS (baseline is promptly as the basis of follow-up study) is:
Define the new RS of two classes:
● DMRS is used for the pilot tone of PDSCH (physical downlink share channel) demodulation.
● CSI-RS is used to obtain the pilot tone of channel condition information (CSI).
The design constraint of DMRS is:
● DMRS is user specific (ue-specific), only transmission on RB that dispatches and corresponding layer, design principle is that the ue-specific that is used for beam shaping (beamforming) among the LTE R8 is extended to a plurality of layers, here comprised a plurality of implications: 1, DMRS is user's specific (dedicated pilot); 2, only transmission on RB that dispatches and corresponding layer; 3 its design principles are to the expansion of special-purpose pilot tone among the LTE, expand to multilayer by individual layer.The corresponding spatial multiplexing passage of the one deck here.
● mutually orthogonal between the DMRS on the different layers.
● DMRS carries out identical precoding (precoding) operation with data.
The design constraint of CSI-RS is:
● (Cell-specific) that the sub-district is specific.
● in frequency and sparse distribution on the time.
● do not carry out precoding.
Under the MU-MIMO pattern, suppose that two users that carry out MU-MIMO are respectively UE1 and UE2, corresponding channel is respectively H
1And H
2In LTE, because measurement pilot frequency and demodulation pilot frequency are public guide frequency (CRS:common reference signal), for given eNodeB antenna configurations, regardless of the number of plies of the actual use of user, its pattern is changeless, as shown in Figure 1 (the pattern form of normal CP).Therefore UE1 can estimate to obtain channel between itself and the eNodeB by CRS
And, can agonic data unload ripple be shone upon according to the pilot tone pattern of arrangement of antennas correspondence.ENodeB only need notify the transmission rank index information of this user's correspondence, and transmission rank is meant that eNB notifies the active user to transmit the employed number of plies (also being transmission rank indication).UE1 promptly can use
Corresponding code book detects; The code book of supposing the UE1 correspondence is P
1, the code book that UE2 adopted is P
2, and hypothesis UE1 is respectively x with the transmission signal of UE2 on identical resource
1And x
2, thermal noise and interference are N, then can be expressed as for the signal that UE1 receives:
y
1＝H
1(P
1x
1+P
2x
2)+N (1)
Therefore UE1 is by code book P
1And channel
Detect signal itself, in the ideal situation pairing and do not consider under the situation of pre-coding matrix quantization error and inefficacy sexual factor P
1And P
2Quadrature is not and if consider channel estimation bias, the data x of UE2
2Can be not to the data x of UE1
1Produce any interference.When the number of plies of UE1 and UE2 correspondence not simultaneously, the number of plies of supposing the UE1 correspondence is 1, the number of plies of UE2 correspondence is 2, supposes to transmit x at UE2 on layer 2
3, formula (1) becomes:
In the formula (2),
I row corresponding to the pre-coding matrix of UE2.If P
1And P
2Each be listed as all quadratures, data that equally can UE2 can not produce UE1 and disturb.In like manner UE2 can use
Detect.
In LTE, the indication information of order sends to object UE as descending control information by down control channel.Among the LTE, the position of down control channel in the frame structure under the fdd mode as shown in Figure 2, PDCCH accounts for preceding two symbols of a subframe, the 3rd symbol can be used for the transmission of PDCCH and PDSCH according to the loading condition of control channel.
Under the MU-MIMO pattern, depend on and whether allow UE to carry out victim compression, exist two kinds of different designs may:
(a) different UEs of carrying out MU-MIMO adopts identical DMRS, and promptly DMRS shares different users.This moment, identical frequency pilot sign carried out precoding processing and mutual superposition with the different user corresponding precoding vector respectively, when two UE precodings, use code book (most cases is such during quadrature fully, because the code book of multiuser MIMO be non-unitary (non-unitary matrix, in SU-MIMO, the precoding vector of different layers is taken from the different lines of same unitary matrice, and among the MU-MIMO, the precoding vector that can not guarantee different user is from same unitary matrice, in LTE, be called non-unitary's), pilot tone can be interfered, and the interference of pilot tone is identical with the annoyance level of data between the user between the user.
(b) different UEs of carrying out MU-MIMO adopts the DMRS of quadrature, and promptly different user adopts the DMRS of quadrature, this moment the different user correspondence the DMRS difference, UE can obtain clean separately channel information.The channel of other user can be estimated simultaneously, therefore interference can be compressed by detection algorithm (as MMSE) to current UE.
In LTE-A, according to above-mentioned baseline information, DMRS is based on layer mapping, has known the antenna configurations of eNodeB side even if that is to say the UE side, and the number of plies information that UE still needs to obtain the eNodeB side can be carried out the mapping of separating of data according to the pattern of DMRS.Under the MU-MIMO pattern, design based on the mode of (a), if it is identical to carry out the number of plies of each multiplexing UE correspondence, be assumed to be k, can unify to launch the DMRS pilot tone on k road so in the eNodeB side, all UE all separate mapping according to the DMRS pattern on k road, and detect based on k road pilot tone.
But, if the number of plies difference of different user, be example still with two users in the LTE system, because UE1 only uses 1 layer transmission, UE2 has 2 layer transmission, notifies if continue to use the transmission rank index (TRI:transmission rank index) of LTE, for UE1, then TRI=1 will not know the existence of other layers pilot tone, thereby produce the contradiction that data are separated mapping.The DMRS mapped mode that Fig. 3 shows with frequency division multiplexing (FDM:frequency divided multiplexing) is an example, the discernible DMRS of different UEs position.Therefore need to change order notification of information mode.If the mode based on (b) designs, in LTE-A,, need extra control signaling in order to separate layer mapping and carrier wave mapping.
Summary of the invention
The technical problem to be solved in the present invention provides the Notification Method and the system of a kind of multi-user multiple input multiple output mode lower floor map information, and the data that can avoid UE not know that the existence of other layers pilot tone causes are separated mapping problems, improves the detection performance of user data.
In order to address the above problem, the invention provides the Notification Method of a kind of multi-user's multiple-input and multiple-output (MU-MIMO) pattern lower floor map information, be applied to adopt the communication system of demodulation pilot frequency (DMRS), comprising:
Transmit leg carries out distributing between a group of recipient of MU-MIMO transmission the DMRS of quadrature, the number of plies sum that the port number of the DMRS that uses uses separately for this group of recipient on the resource for this group of recipient distribution for pairing under the MU-MIMO transmission mode; To each recipient in this group of recipient, described transmit leg is notified this recipient with the mapped mode information of this recipient's codeword current to layer.
Further, above-mentioned Notification Method also can have following characteristics:
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg is total number of plies information that this group of recipient is used, and this recipient notified in the streams of code words index of this recipient's correspondence;
Single user's multiple-input and multiple-output (SU-MIMO) pattern adopts different descending control information formats with the MU-MIMO pattern, and described total number of plies information takies
The streams of code words index takies
Perhaps, single user's multiple-input and multiple-output (SU-MIMO) pattern adopts identical descending control information format with the MU-MIMO pattern, and described total number of plies information takies
Streams of code words index and transmission mode information take
Wherein, L represents the maximum number of plies that system supports, S represents the maximum codeword flow amount that system supports,
Expression rounds up to x.
Further, above-mentioned Notification Method also can have following characteristics:
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg is the mapped mode information with the codeword current to layer of each recipient in this group of recipient, and this recipient notified in the streams of code words index of this recipient's correspondence.
I streams of code words in the set of code words stream that this group of recipient is used, as the mapped mode of each streams of code words before this streams of code words definite after, the kind of the possible mapped mode of this codeword current to layer is then used as greater than 1
The mapped mode of this codeword current to layer of determining of indication information indication, with all indication informations of obtaining sequential combination by streams of code words, mapped mode information as the codeword current to layer of each recipient in this group of recipient sends, i=1 wherein, 2, ... I, the reception number formulary that I comprises for this group of recipient
Expression rounds up to x.
Further, above-mentioned Notification Method also can have following characteristics:
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg be with
Indication information notify this recipient, the species number sum of all possible mapped mode of K each codeword current to layer that may use for this recipient wherein, and the state of this indication information is corresponding to the mapped mode of this recipient's who determines codeword current to layer; Perhaps
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg is to notify this recipient with the bitmap (bitmap) that a units equals the maximum number of plies that system supports, and whether this recipient of value representation of each bit position uses this pairing layer among this Bitmap.
Corresponding with above-mentioned Notification Method, the invention provides a kind of communication system of employing multi-user's multiple-input and multiple-output (MU-MIMO) pattern, comprise the transmit leg that is used to send user data and demodulation pilot frequency (DMRS), and the recipient who is used for receiving subscriber data and DMRS, wherein:
Described transmit leg is under the MU-MIMO transmission mode, and a group of recipient of carrying out MU-MIMO transmission for pairing adopts the DMRS of quadrature, the number of plies sum that the port number of the DMRS that uses uses separately for this group of recipient on the resource for this group of recipient distribution; To each recipient in this group of recipient, described transmit leg is notified this recipient with the mapped mode information of this recipient's codeword current to layer;
Described recipient carries out channel estimating according to the mapped mode information of the described codeword current to layer of receiving to each layer, and streams of code words is separated the carrier wave mapping conciliate layer mapping.
Further, above-mentioned communication system also can have following characteristics:
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be total number of plies information that this group of recipient is used, and this recipient notified in the streams of code words index of this recipient's correspondence;
Described transmit leg adopts different descending control information formats to single user's multiple-input and multiple-output (SU-MIMO) pattern with the MU-MIMO pattern, and described total number of plies information takies
The streams of code words index takies
Perhaps, described transmit leg adopts identical descending control information format to single user's multiple-input and multiple-output (SU-MIMO) pattern with the MU-MIMO pattern, and total number of plies information takies
Streams of code words index and transmission mode information take
Wherein, L represents the maximum number of plies that system supports, S represents the maximum codeword flow amount that system supports,
Expression rounds up to x.
Further, above-mentioned communication system also can have following characteristics:
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be the mapped mode information with the codeword current to layer of each recipient in this group of recipient, and this recipient notified in the streams of code words index of this recipient's correspondence.
I streams of code words in the set of code words stream that described transmit leg uses this group of recipient, as the mapped mode of each streams of code words before this streams of code words definite after, the kind of the possible mapped mode of this codeword current to layer is then used as greater than 1
The mapped mode of this codeword current to layer of determining of indication information indication, with all indication informations of obtaining sequential combination by streams of code words, mapped mode information as the codeword current to layer of each recipient in this group of recipient sends, i=1 wherein, 2, ... I, the reception number formulary that I comprises for this group of recipient
Expression rounds up to x.
Further, above-mentioned communication system also can have following characteristics:
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be with
Indication information notify this recipient, the species number sum of all possible mapped mode of K each codeword current to layer that may use for this recipient wherein, and the state of this indication information is corresponding to the mapped mode of this recipient's who determines codeword current to layer; Perhaps
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be to notify this recipient, and whether this recipient of value representation of each bit position use this pairing layer among this Bitmap with the bitmap (bitmap) that a units equals the maximum number of plies that system supports.
In order to solve the problems of the technologies described above, the present invention also provides the Notification Method of a kind of multi-user's multiple-input and multiple-output (MU-MIMO) pattern lower floor map information, is applied to adopt the communication system of demodulation pilot frequency (DMRS), comprising:
Transmit leg is under the MU-MIMO transmission mode, and the shared DMRS of a group of recipient of MU-MIMO transmission is carried out in pairing, determines the port number of DMRS according to the number of plies of using the maximum recipient's correspondence of the number of plies; To each recipient in this group of recipient, described transmit leg is notified this recipient with the mapped mode information of this recipient's codeword current to layer.
Further, above-mentioned Notification Method also can have following characteristics:
When described transmit leg carries out MU-MIMO, only the identical recipient of the number of plies who uses is matched, pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, the number of plies information that transmit leg will use on the resource for this group of recipient distribution is notified this recipient.
Further, above-mentioned Notification Method also can have following characteristics:
It is identical or different that the level that each recipient in the group of recipient of MU-MIMO transmission uses is carried out in pairing, pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, transmit leg sends the number of plies information that this recipient uses by the control channel unit of this recipient's special use, and do not use and on the Resource Unit of the DMRS pilot frequency locations correspondence that on the same group other recipients use data are punched this recipient, perhaps on this pilot frequency locations, carry out data and DMRS pilot tone multiplexing.
Such scheme notifies the maximum number of plies and layer to separate under the mapped mode at the same time, utilizes small signaling consumption to be cost, can improve MU-MIMO user and carry out channel estimated accuracy, thereby raising is to the detection performance of user data.In addition, the DMRS of quadrature design can make the user utilize the mode of interference eliminated to carry out Data Detection, reduces the influence of inter-user interference.And but the pairing user number of plies of constraint MU-MIMO equates under the pattern, then again under the pattern without any extra signaling consumption, solves layer mapping problems of separating under the MU-MIMO pattern that the DMRS design causes.
Description of drawings
Fig. 1 is the schematic diagram of the mapping method (normal CP) of existing CRS, wherein
The frequency pilot sign of expression antenna port 0 correspondence,
The frequency pilot sign of expression antenna port 1 correspondence,
The frequency pilot sign of expression antenna port 2 correspondences,
The frequency pilot sign of expression antenna port 3 correspondences.
Fig. 2 is the schematic diagram of the position of PDCCH in frame structure among the LTE.
Fig. 3 is that the number of plies of UE1 is 1, and the UE2 number of plies is 2 o'clock, share under the DMRS situation, and when only notifying separately user's number of plies, the schematic diagram of the discernible DMRS of different UEs position, among the figure,
The DMRS of presentation layer 0,
The DMRS of presentation layer 1.
Fig. 4 A is the schematic diagram that different user flows to the mapping relations of layer among a kind of MU-MIMO, and CW1 among the figure, CW2 represent 2 streams of code words, and S/P represents string and conversion.
Fig. 4 B is under the quadrature DMRS pattern, when streams of code words (codeword stream) to the mapped mode of layer when known, by notifying total number of plies, and with 1bit indication stream sequence number, different UEs can be discerned the schematic diagram of the DMRS of each self-corresponding layer.Among the figure
The DMRS of presentation layer 0,
The DMRS of presentation layer 1.
Fig. 5 is the schematic diagram of the mapped mode between descending streams of code words and the layer.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is elaborated.
Under MU-MIMO and Data Detection pattern based on DMRS, be eNodeB with the transmit leg, the recipient is an example for UE, in other embodiments, transmit leg is eNB, Relay, HomeENB or the like, and the recipient can be UE, Relay etc.In the present embodiment, the process of transmitting of user data and pilot tone comprises:
In LTE-A, owing to defined CSI-RS, and can obtain the channel coefficients of all antenna ports to UE based on CSI-RS, therefore, UE can give eNodeB with the CSI feedback information by the pattern of explicit (explicit) or implicit expression (implicit) by channel estimating.
Step 2, eNodeB is according to the CSI information of UE feedback, and for the suitable code modulation mode and the pre-coding matrix of UE selection of each scheduling, under the MU-MIMO pattern, eNodeB needs further to select orthogonality UE pairing preferably;
Step 3, eNodeB carries out layer mapping according to the number of plies that each UE use of MU-MIMO transmission is carried out in pairing to the data of each UE;
Step 4, eNodeB carries out precoding processing respectively to the data of each UE of matching respectively;
Be multiplexed with example with 2 UE.Suppose that the UE of pairing is respectively UE1 and UE2, and the pre-coding matrix of UE1 and UE2 correspondence is respectively P in a given resource
1And P
2, and data waiting for transmission are respectively
With
Wherein
Expression l
iThe data vector of * 1 dimension, l
iThe number of plies of representing i UE correspondence.ENodeB is right respectively
With
Carry out precoding processing with precoding vectors, obtain
With
Wherein
With
Dimension all be N
Tr* 1, N
TrExpression transmitting antenna port number.
Step 5 is carried out multiplexing process with the data of UE.Be example still, obtain behind the data multiplex of UE1 and UE2 with two UE in the step 4
No matter be the DMRS that different UEs is shared each layer, still DMRS independently, the equal quadrature of different layers DMRS just when DMRS independently, needs more multi-layered DMRS.
When DMRS was shared in employing, different UE adopted identical DMRS position and sequence, but different UEs is carried out the used weights difference of precoding processing to pilot tone, and will superpose with the pilot tone after the weighting of different precoding weights.And adopt the situation of independent DMRS for different UEs, DMRS difference (the sequence difference of different UE, the position also may be different (when DMRS between the user adopts under the CDM multiplex mode, DMRS position between UE is identical, when the DMRS between the user adopts FDM, the position difference)), this moment, different UEs was mapped to pilot tone respectively on the pattern position of respective layer separately, carried out precoding processing.
Step 7, eNodeB is mapped to data and pilot tone on the corresponding RB respectively, and carries out IFFT, adds the CP processing and carries out the up-conversion emission.
Among the embodiment one to embodiment six, the above-mentioned data handling procedure of transmit leg can will mainly be described the Notification Method of layer map information among the embodiment with reference to above-mentioned flow process.Background technology has two kinds of patterns when the MU-MIMO pattern has been described: the DMRS of different UEs non-orthogonal (shared DMRS), or the DMRS quadrature of different UEs.Among preceding two embodiment, transmit leg is under the MU-MIMO transmission mode, and the shared DMRS of a group of recipient of MU-MIMO transmission is carried out in pairing, determines the port number of DMRS according to the number of plies of using the maximum recipient's correspondence of the number of plies; Among the embodiment afterwards, transmit leg is under the MU-MIMO transmission mode, carry out distributing between a group of recipient of MU-MIMO transmission the DMRS of quadrature for pairing, the number of plies sum that the port number of the DMRS that uses uses separately for this group of recipient on the resource for this group of recipient distribution.Among these embodiment, transmit leg is to each recipient in this group of recipient, all needs to notify this recipient with the mapped mode information of this recipient's codeword current to layer.
Embodiment one
In the present embodiment, a plurality of UE adopt nonopiate DMRS (DMRS shares) pattern.
Present embodiment is on the basis of above-mentioned data handling procedure, eNodeB need limit the identical UE of the number of plies that has only use and can match and carry out MU-MIMO, each UE that the MU-MIMO transmission is carried out in pairing adopts identical DMRS, pairing is carried out each UE among one group of UE of MU-MIMO transmission, eNodeB only need notify the number of plies information of using on the resource for this group UE distribution.
Under this pattern, be example explanation recipient's reception treatment step with UE1.
Steps A, UE1 at first receives control signaling indication information, obtains the number of plies information of DMRS;
Step B according to the number of plies information of DMRS, carries out channel estimating to each layer respectively;
The mode of this moment is with similar among the LTE, and the pilot tone pattern of DMRS is mapped on the layer, has known the number of plies, has also just known pilot tone pattern and frequency pilot sign.
If the number of plies that transmit leg UE1 and UE2 use is 2, the pilot signal that UE1 receives is:
Wherein
The DMRS pilot signal that expression sends, H
1The channel matrix of expression UE1.
Since in the pairing process, the P of selection
2Be and H
1The as far as possible UE of quadrature, i.e. H
1* P
2Signal with respect to UE1 is to be approximately 0 very little value.Then (3) formula is approximately
Wherein I is the precoding vector interference that precoding brings to pilot tone by UE2
Use y
pConjugation with pilot signal
Multiply each other, then can obtain channel through precoding:.
Step 230, according to the pilot tone pattern of DMRS number of plies information correspondence, UE separates the carrier wave mapping to streams of code words;
Step 240, the channel that UE obtains with channel estimating through the pre-coding matrix processing
Data are detected, and, detected user data is separated layer mapping, thereby obtain to send signal according to number of plies information.
For UE2, processing procedure is the same.
Under above-mentioned processing mode, when the channel of the precoding vectors of UE2 and UE1 is non-orthogonal, can produces the Data Detection of UE1 and channel estimating and disturb.
Embodiment two
In the present embodiment, adopt under nonopiate DMRS (DMRS shares) pattern at a plurality of UE, the UE number of plies of matching among the MU-MIMO can be different.
If demodulation pilot frequency designs according to the FDM pattern, the difference of present embodiment and embodiment one is, pairing is carried out each UE among one group of UE of MU-MIMO transmission, eNodeB only sends the number of plies information that this UE uses by the control channel unit of this UE special use, and do not use and on the RE of the DMRS pilot frequency locations correspondence that on the same group other UE use data are punched at this UE, perhaps on this position, carry out data and DMRS pilot tone multiplexing.
Under FDM pilot frequency multiplexing pattern, because UE can't discern the existence of other layers, current UE can be used as the pilot tone on the own otiose layer data processing of oneself, and this moment, eNodeB will punch to data on the RE of the DMRS pilot frequency locations correspondence that current UE is not used.To avoid that the pilot tone of other layers is produced interference, perhaps data and pilot tone stack are sent.
When punching or stack sent, the employed weights of the data of current UE were determined by current UE, and the weights that DMRS adopts by use when the weights weighting of the UE correspondence of anterior layer promptly: (P
1S+P
2P), P wherein
1And P
2Be precoding weights or beam shape-endowing weight value (P
1For current UE, P
2Be pairing UE's), s is the data of UE, p is the frequency pilot sign of other layers of the RE correspondence of data s mapping.And for the DMRS part of sharing, with identical among the embodiment one, the UE that carries out MU-MIMO carries out after to pilot weighted multiplexing with separately weights respectively.
Recipient's concrete processing is compared with embodiment one, and except when separating the carrier wave mapping, the DMRS position that the UE that the number of plies is few can not have oneself to use is outside being for data processing, and other operating procedures of UE side are identical.
Embodiment three
Among the MU-MIMO of present embodiment, different UE uses the DMRS of quadrature.
A kind of advice method that present embodiment proposes is, pairing carried out each UE among one group of UE of MU-MIMO transmission, and eNodeB notifies this group UE total number of plies information of use, and the streams of code words index of this UE correspondence.
Total bit expense can be expressed as: total number of plies information takies
Wherein L represents the maximum number of plies that system supports, the streams of code words index takies
Be used to indicate the streams of code words of UE correspondence.Wherein S represents the maximum codeword flow amount that system supports,
Expression rounds up to x.When SU-MIMO adopted identical Downlink Control Information (DCI) form with MU-MIMO, streams of code words index and transmission mode information took
The maximum number of plies of supposing the system support is 8, and the maximum codeword flow amount is 2, and is similar with embodiment two, separates the mapping of mapping reconciliation layer for UE can carry out carrier wave effectively, and notify UE with the total number of plies information of 3bit and the streams of code words index of 1bit this moment.When SU-MIMO and MU-MIMO adopt identical DCI form, adopt the streams of code words index of 2bit.Total bit expense is 4 or 5bit.
UE can separate the carrier wave mapping according to total number of plies information, and according to the layer mapped mode information of total number of plies information and the indication of streams of code words index, UE can obtain corresponding layer information and separate layer mapping simultaneously.And when SU-MU-MIMO adopts identical DCI pattern, needing increases a bit or uses a residual state to indicate SU-MIMO, so-called residual state can be a kind of value of not using in the DCI signaling, certain signaling as 3bit has 8 kinds of values, can indicate 8 states, and this signaling only need be used 6 states wherein, just can use a remaining state to indicate SU-MIMO.
Mapped mode with codeword current to layer shown in Fig. 5 is an example, total number of plies is 8, and 2 streams of code words CW1 and CW2 are arranged at most, and the total mapping number of plies of these 2 streams of code words can be 2～8 when multiplexing, the number of plies of CW1 mapping is 1～4, corresponding to first to fourth layer, and the number of plies of CW2 mapping also can be 1～4, and it is relevant with the number of plies of CW1 mapping to be mapped to which layer, the number of plies as CW1, CW2 mapping was respectively 2 o'clock, CW1 is mapped to the 1st, 2 layer, and CW2 is mapped to the 3rd, 4 layer.Grid below the figure middle level 2, layer 3 and layer 4 is represented single codeword stream situation among the SU-MIMO.Because the mapped mode of codeword current to layer is fixed, known the streams of code words index and the total number of plies of oneself as UE after, can obtain each self-corresponding layer of information according to the two mapped modes of sending out known of transmitting-receiving.
Shown in Fig. 4 (a), suppose that the pilot tone of UE1 and UE2 is mapped to layer 1,2 and layer 3,4 respectively.And under the corresponding layer situation that mapped mode UE is known, at first obtain total number of plies information by total number of plies indication information (3bit), this moment, total number of plies information was 4, and then by streams of code words index (1bit), the streams of code words of current UE correspondence can be obtained, thereby the layer mapped mode that this UE is concrete can be known.
Other processing procedures are not repeating.
Embodiment four
Among the MU-MIMO of present embodiment, different UE uses the DMRS of quadrature.
The Notification Method of a kind of layer of map information that present embodiment proposes is: pairing is carried out each UE among one group of UE of MU-MIMO transmission, eNode need notify the mapped mode information of the codeword current to layer of each UE among this group UE, and the streams of code words index of this UE correspondence.
Particularly, at first consider the species number m of the layer mapped mode that streams of code words CW1 is possible
1＞1 o'clock, the layer mapped mode of indication CW1 needed
Under the situation that each layer of streams of code words CW1 mapped mode determined, the mapping scope of each layer of streams of code words CW2 will suffer restraints, and according to constraint, can determine the species number m of the layer mapped mode that streams of code words CW2 is possible
2＞1 o'clock, need during the layer mapped mode of indicating CW2
By that analogy, under all in front all fixed modes of code word fluid layer mapped mode, greater than 1 streams of code words CWi, the layer mapped mode of indication CWi needs to the species number of last possible layer mapped mode
But the species number of ergosphere mapped mode equals 1 streams of code words and need not to take the bit indication and can determine.Like this, the pairing mapped mode information of all streams of code words of carrying out one group of UE of MU-MIMO transmission need take
Suppose that the MU-MIMO data send employed layer mapped mode shown in the situation of two streams of code words among Fig. 5 this moment, for each UE, its corresponding streams of code words may also may be CW2 corresponding to the CW1 among Fig. 5.In the NodeB side, when UE1 corresponding to CW1, possible mapped mode has 4 kinds.Wherein corresponding to the mapped mode of each CW1, except the number of plies was 8 situation, the mapped mode of CW2 all had 2 kinds, therefore can be with 3 bit marker mapped modes.The mapped mode of 2bit (MSB (bit's is high 2) or LSB (in the bit sequence low 2)) indication CW1 wherein, under the situation that 1bit indication CW1 mapped mode is determined down, the CW2 mapping is any corresponding to two kinds of patterns.
This mode is applicable to that the layer mapping of back is subjected to the scene of front layer mapping restriction, and with the streams of code words index of a bit or a residual state indication UE correspondence, layer mapping this moment notice needs 3～4bit equally simultaneously.As shown in Figure 5, according to top mapped mode, suppose that streams of code words 1 uses 2bit, at least 2 layers among the MU-MIMO, the mapped mode of streams of code words 1 has 4 kinds, represents with 2bit, for example represent that with 01 streams of code words 1 has been mapped to the situation of 2 layers, then 4layer and 5layer situation in the corresponding diagram, in both cases, the mapped mode of streams of code words 1 is identical, and streams of code words 2 differences, and then can to determine with 1bit specifically be layer4 or the situation of layer5, for example is 0, then corresponding to the layer4 scene.If the streams of code words index of 1bit or state indication current UE correspondence is arranged again, for example be 1, then current UE can know that own correspondence is a streams of code words 2, and then can determine own to 3,4 layers.
After knowing the layer mapped mode that oneself uses, UE can handle based on the mode of embodiment one, finishes Data Receiving.
Embodiment five
Among the MU-MIMO of present embodiment, different UE uses the DMRS of quadrature.
Similar to embodiment four, the Notification Method of a kind of layer of map information that present embodiment proposes is: pairing is carried out each UE among one group of UE of MU-MIMO transmission, the eNode notice
Indication information, the species number sum of all possible mapped mode of each codeword current to layer that K may use for this UE, the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this UE that determines.
Suppose that the MU-MIMO data send employed layer mapped mode shown in the situation of two streams of code words among Fig. 5 this moment, for each UE, its corresponding streams of code words may also may be CW2 corresponding to the CW1 among Fig. 5.In the NodeB side, when UE1 corresponding to CW1, possible mapped mode has 4 kinds, as UE1 during corresponding to CW2, possible is mapped with 7 kinds, totally 11 kinds.Then, total bit expense can be expressed as
According to
Indication information know the layer mapped mode that oneself uses after, UE can handle based on the mode of embodiment one, finishes Data Receiving.
Embodiment six
Among the MU-MIMO of present embodiment, different UE uses the DMRS of quadrature.
The Notification Method of a kind of layer of map information that present embodiment proposes is: pairing is carried out each UE among one group of UE of MU-MIMO transmission, the bitmap (bitmap) that eNode notifies a units to equal the maximum number of plies of system's support, whether this UE of the value representation of each bit position uses this pairing layer among this Bitmap.
After knowing the layer mapped mode that oneself uses according to Bitmap, UE can handle based on the mode of embodiment one, finishes Data Receiving.
The layer that this mode is applicable to each UE is the pattern of quadrature mapping at random.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the Notification Method of multi-user's multiple-input and multiple-output (MU-MIMO) pattern lower floor map information is applied to adopt the communication system of demodulation pilot frequency (DMRS), comprising:
Transmit leg carries out distributing between a group of recipient of MU-MIMO transmission the DMRS of quadrature, the number of plies sum that the port number of the DMRS that uses uses separately for this group of recipient on the resource for this group of recipient distribution for pairing under the MU-MIMO transmission mode; To each recipient in this group of recipient, described transmit leg is notified this recipient with the mapped mode information of this recipient's codeword current to layer.
2. Notification Method as claimed in claim 1 is characterized in that:
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg is total number of plies information that this group of recipient is used, and this recipient notified in the streams of code words index of this recipient's correspondence;
Single user's multiple-input and multiple-output (SU-MIMO) pattern adopts different descending control information formats with the MU-MIMO pattern, and described total number of plies information takies
The streams of code words index takies
Perhaps, single user's multiple-input and multiple-output (SU-MIMO) pattern adopts identical descending control information format with the MU-MIMO pattern, and described total number of plies information takies
Streams of code words index and transmission mode information take
Wherein, L represents the maximum number of plies that system supports, S represents the maximum codeword flow amount that system supports,
Expression rounds up to x.
3. Notification Method as claimed in claim 1 is characterized in that:
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg is the mapped mode information with the codeword current to layer of each recipient in this group of recipient, and this recipient notified in the streams of code words index of this recipient's correspondence.
I streams of code words in the set of code words stream that this group of recipient is used, as the mapped mode of each streams of code words before this streams of code words definite after, the kind of the possible mapped mode of this codeword current to layer is then used as greater than 1
The mapped mode of this codeword current to layer of determining of indication information indication, with all indication informations of obtaining sequential combination by streams of code words, mapped mode information as the codeword current to layer of each recipient in this group of recipient sends, i=1 wherein, 2, ... I, the reception number formulary that I comprises for this group of recipient
Expression rounds up to x.
4. Notification Method as claimed in claim 1 is characterized in that:
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg be with
Indication information notify this recipient, the species number sum of all possible mapped mode of K each codeword current to layer that may use for this recipient wherein, and the state of this indication information is corresponding to the mapped mode of this recipient's who determines codeword current to layer; Perhaps
Pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, described transmit leg is to notify this recipient with the bitmap (bitmap) that a units equals the maximum number of plies that system supports, and whether this recipient of value representation of each bit position uses this pairing layer among this Bitmap.
5. the Notification Method of multi-user's multiple-input and multiple-output (MU-MIMO) pattern lower floor map information is applied to adopt the communication system of demodulation pilot frequency (DMRS), comprising:
Transmit leg is under the MU-MIMO transmission mode, and the shared DMRS of a group of recipient of MU-MIMO transmission is carried out in pairing, determines the port number of DMRS according to the number of plies of using the maximum recipient's correspondence of the number of plies; To each recipient in this group of recipient, described transmit leg is notified this recipient with the mapped mode information of this recipient's codeword current to layer.
6. Notification Method as claimed in claim 5 is characterized in that:
When described transmit leg carries out MU-MIMO, only the identical recipient of the number of plies who uses is matched, pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, the number of plies information that transmit leg will use on the resource for this group of recipient distribution is notified this recipient.
7. Notification Method as claimed in claim 5 is characterized in that:
It is identical or different that the level that each recipient in the group of recipient of MU-MIMO transmission uses is carried out in pairing, pairing is carried out each recipient in the group of recipient of MU-MIMO transmission, transmit leg sends the number of plies information that this recipient uses by the control channel unit of this recipient's special use, and do not use and on the Resource Unit of the DMRS pilot frequency locations correspondence that on the same group other recipients use data are punched this recipient, perhaps on this pilot frequency locations, carry out data and DMRS pilot tone multiplexing.
8. a communication system that adopts multi-user's multiple-input and multiple-output (MU-MIMO) pattern comprises the transmit leg that is used to send user data and demodulation pilot frequency (DMRS), and the recipient who is used for receiving subscriber data and DMRS, it is characterized in that:
Described transmit leg is under the MU-MIMO transmission mode, and a group of recipient of carrying out MU-MIMO transmission for pairing adopts the DMRS of quadrature, the number of plies sum that the port number of the DMRS that uses uses separately for this group of recipient on the resource for this group of recipient distribution; To each recipient in this group of recipient, described transmit leg is notified this recipient with the mapped mode information of this recipient's codeword current to layer;
Described recipient carries out channel estimating according to the mapped mode information of the described codeword current to layer of receiving to each layer, and streams of code words is separated the carrier wave mapping conciliate layer mapping.
9. communication system as claimed in claim 8 is characterized in that:
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be total number of plies information that this group of recipient is used, and this recipient notified in the streams of code words index of this recipient's correspondence;
Described transmit leg adopts different descending control information formats to single user's multiple-input and multiple-output (SU-MIMO) pattern with the MU-MIMO pattern, and described total number of plies information takies
The streams of code words index takies
Perhaps, described transmit leg adopts identical descending control information format to single user's multiple-input and multiple-output (SU-MIMO) pattern with the MU-MIMO pattern, and total number of plies information takies
Streams of code words index and transmission mode information take
Wherein, L represents the maximum number of plies that system supports, S represents the maximum codeword flow amount that system supports,
Expression rounds up to x.
10. communication system as claimed in claim 8 is characterized in that:
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be the mapped mode information with the codeword current to layer of each recipient in this group of recipient, and this recipient notified in the streams of code words index of this recipient's correspondence.
I streams of code words in the set of code words stream that described transmit leg uses this group of recipient, as the mapped mode of each streams of code words before this streams of code words definite after, the kind of the possible mapped mode of this codeword current to layer is then used as greater than 1
The mapped mode of this codeword current to layer of determining of indication information indication, with all indication informations of obtaining sequential combination by streams of code words, mapped mode information as the codeword current to layer of each recipient in this group of recipient sends, i=1 wherein, 2, ... I, the reception number formulary that I comprises for this group of recipient
Expression rounds up to x.
11. communication system as claimed in claim 8 is characterized in that:
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be with
Indication information notify this recipient, the species number sum of all possible mapped mode of K each codeword current to layer that may use for this recipient wherein, and the state of this indication information is corresponding to the mapped mode of this recipient's who determines codeword current to layer; Perhaps
Described transmit leg carries out each recipient in the group of recipient of MU-MIMO transmission to pairing, be to notify this recipient, and whether this recipient of value representation of each bit position use this pairing layer among this Bitmap with the bitmap (bitmap) that a units equals the maximum number of plies that system supports.
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Effective date of registration: 20201222 Address after: 226000 399 Taiping Road Nantong Jiangsu Province Patentee after: NANTONG HUAXIN AIR CONDITIONER Co.,Ltd. Address before: 518057 Department of law, Zhongxing building, South hi tech Industrial Park, Nanshan District hi tech Industrial Park, Guangdong, Shenzhen Patentee before: ZTE Corp. |
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