CN101932096B - 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-usermultiple input multiple output, is abbreviated as MU-MIMO) pattern, the Notification Method of layer map information and system.
Background technology
Current, in 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, suppose according to current design, the baseline (baseline, namely as the basis of follow-up study) of DMRS and CSI-RS is:
Define the RS that two classes are new:
DMRS, for the pilot tone of PDSCH (physical downlink share channel) demodulation.
CSI-RS, for obtaining the pilot tone of channel condition information (CSI).
The design constraint of DMRS is:
DMRS is user specific (ue-specific), only transmit on the RB and corresponding layer of scheduling, design principle extends to multiple layer in LTE R8 for the ue-specific of beam forming (beamforming), here multiple implication is contained: 1, DMRS is user's specific (dedicated pilot); 2, only transmit on the RB and corresponding layer of scheduling; 3 its design principles are the expansions to LTE dedicated pilot, expand to multilayer by individual layer.Here the corresponding spatial multiplexing passage of one deck.
Mutually orthogonal between DMRS on different layers.
DMRS and data carry out identical precoding (precoding) operation.
The design constraint of CSI-RS is:
Community specific (Cell-specific).
Sparse distribution over frequency and over time.
Do not carry out precoding.
Under MU-MIMO pattern, suppose that two users carrying out MU-MIMO are respectively UE1 and UE2, corresponding channel is respectively H
1and H
2.In LTE, because measurement pilot frequency and demodulation pilot frequency are public guide frequency (CRS:common reference signal), for given eNodeB antenna configuration, regardless of the number of plies of the actual use of user, its pattern is changeless, as shown in Figure 1 (pattern of normal CP).Therefore UE1 can estimate to obtain the channel between itself and eNodeB by CRS
and the pilot tone pattern of configuration correspondence according to antenna, can agonic data unload ripple be mapped.ENodeB only needs the transmission rank index information notifying that this user is corresponding, and transmission rank refers to that eNB notifies that active user transmits the used number of plies (being also transmission rank indication).Namely UE1 can use
corresponding code book detects; Suppose that the code book that UE1 is corresponding is P
1, the code book that UE2 adopts is P
2, and hypothesis UE1 and UE2 transmission signal is on the same resource respectively x
1and x
2, thermal noise and interference are N, then can be expressed as 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, ideally pairing and when not considering pre-coding matrix quantization error and ineffectiveness factor, P
1and P
2orthogonal, and if do not consider channel estimation bias, the data x of UE2
2can not to the data x of UE1
1produce any interference.When the number of plies that UE1 with UE2 is corresponding is different, suppose that the number of plies that UE1 is corresponding be the number of plies that 1, UE2 is corresponding is 2, supposes on layer 2, to transmit x at UE2
3, formula (1) becomes:
In formula (2), P
2 (i)corresponding to the i-th row of the pre-coding matrix of UE2.If P
1and P
2each row all orthogonal, equally can UE2 data can not to UE1 produce interference.In like manner UE2 can use
detect.
In LTE, the indication information of order, as descending control information, sends to object UE by down control channel.In LTE, as shown in Figure 2, PDCCH accounts for the first two symbol of a subframe to the position in down control channel frame structure in the fdd mode, and the 3rd symbol, according to the loading condition of control channel, may be used for the transmission of PDCCH and PDSCH.
Under MU-MIMO pattern, depend on and whether allow UE to carry out victim compression, exist two kinds of different designs may:
A different UEs that () carries out MU-MIMO adopts identical DMRS, and namely DMRS shares different users.Now identical frequency pilot sign has carried out precoding processing with the precoding vectors that different user is corresponding and superposition mutually respectively, use when two UE precodings code book can not complete orthogonal time (most cases is such, because the code book of multiuser MIMO be non-unitary (non-unitary matrix, in SU-MIMO, the precoding vector of different layers takes from the different lines of same unitary matrice, and in MU-MIMO, can not ensure that the precoding vector of different user is from same unitary matrice, in LTE, be called non-unitary's), pilot tone can be interfered, between user, the interference of pilot tone is identical with the annoyance level of data between user.
B different UEs that () carries out MU-MIMO adopts orthogonal DMRS, and namely different user adopts orthogonal DMRS, and the DMRS that now different user is corresponding is different, and UE can obtain channel information clean separately.The channel of other user to current UE can be estimated simultaneously, therefore can compress interference by detection algorithm (as MMSE).
In LTE-A, according to above-mentioned baseline information, DMRS maps based on layer, even if that is UE side is aware of the antenna configuration of eNodeB side, UE still needs the number of plies information obtaining eNodeB side can carry out the demapping of data according to the pattern of DMRS.Under MU-MIMO pattern, based on the patten's design of (a), if the number of plies of carrying out multiplexing each UE corresponding is identical, be assumed to be k, the DMRS pilot tone of launching k road so can be unified in eNodeB side, all UE all carry out demapping according to the DMRS pattern on k road, and detect based on k road pilot tone.
But, if the number of plies of different user is different, still for the user of two in LTE system, because UE1 only uses 1 layer transmission, UE2 has 2 layer transmission, if the transmission rank index (TRI:transmission rank index) continuing to use LTE notifies, for UE1, then TRI=1, will not know the existence of other layer of pilot tone, thus produce the contradiction of data demapping.Fig. 3 shows for the DMRS mapped mode of frequency division multiplexing (FDM:frequency divided multiplexing), the discernible DMRS position of different UEs.Therefore the advice method changing order information is needed.If based on the patten's design of (b), in LTE-A, map and carrier wave mapping in order to solution layer can be carried out, need extra control signal notice.
Summary of the invention
The technical problem to be solved in the present invention is to provide Notification Method and the system of a kind of multi-user multiple input multiple output mode lower floor map information, and UE can be avoided not know the data demapping problem that the existence of other layer of pilot tone causes, and improves the detection perform of user data.
In order to solve the 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 the communication system adopting demodulation pilot frequency (DMRS), comprising:
Transmit leg is under MU-MIMO transmission pattern, and distribute orthogonal DMRS between one group of recipient that MU-MIMO transmission is carried out in pairing, the port number of the DMRS that the resource of distributing for this group recipient uses is the number of plies sum that this group recipient uses separately; To each recipient in this group recipient, the mapping pattern information of the codeword current to layer of this recipient is notified this recipient by described transmit leg.
Further, above-mentioned Notification Method also can have following characteristics:
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is the total number of plies information this group recipient used, and streams of code words index corresponding to this recipient notifies this recipient;
Single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern adopt different descending control information formats, and described total number of plies information takies
bit, streams of code words index takies
bit; Or single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern adopt identical descending control information format, described total number of plies information takies
bit, streams of code words index and transmission mode information take
bit; Wherein, L represents that the maximum number of plies that system is supported, S represent the maximum codeword flow amount that system is supported,
represent and x is rounded up.
Further, above-mentioned Notification Method also can have following characteristics:
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and streams of code words index corresponding to this recipient notifies this recipient.
I-th streams of code words in the one group of streams of code words use this group recipient, after the mapped mode as each streams of code words before this streams of code words is determined, the kind of the possible mapped mode of this codeword current to layer as being greater than 1, is then used
the indication information of bit indicates the mapped mode of this codeword current to layer determined, by all indication informations of obtaining sequential combination by streams of code words, mapping pattern information as the codeword current to layer of recipient each in this group recipient sends, wherein i=1,2, ... I, I are the reception number formulary that this group recipient comprises
represent and x is rounded up.
Further, above-mentioned Notification Method also can have following characteristics:
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg be by
the indication information of bit notifies this recipient, wherein K is the species number sum of all possible mapped mode of each codeword current to layer that this recipient may use, and the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this recipient determined; Or
To matching each recipient carried out in one group of recipient of MU-MIMO transmission, described transmit leg is that the bitmap (bitmap) units being equaled the maximum number of plies that system is supported notifies this recipient, and in this Bitmap, the value of each bit position represents whether this recipient uses the layer corresponding to this.
Corresponding to above-mentioned Notification Method, the invention provides a kind of communication system adopting multi-user's multiple-input and multiple-output (MU-MIMO) pattern, comprise the transmit leg for sending user data and demodulation pilot frequency (DMRS), and for receiving the recipient of user data and DMRS, wherein:
Described transmit leg is under MU-MIMO transmission pattern, and the one group of recipient carrying out MU-MIMO transmission for pairing adopts orthogonal DMRS, and the port number of the DMRS that the resource of distributing for this group recipient uses is the number of plies sum that this group recipient uses separately; To each recipient in this group recipient, the mapping pattern information of the codeword current to layer of this recipient is notified this recipient by described transmit leg;
Described recipient, according to the mapping pattern information of the described codeword current to layer received, carries out channel estimating to each layer, and carries out the mapping of solution carrier wave mapping reconciliation layer to streams of code words.
Further, above-mentioned communication system also can have following characteristics:
Described transmit leg, to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, is the total number of plies information this group recipient used, and streams of code words index corresponding to this recipient notifies this recipient;
Described transmit leg adopts different descending control information formats to single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern, and described total number of plies information takies
bit, streams of code words index takies
bit; Or described transmit leg adopts identical descending control information format to single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern, total number of plies information takies
bit, streams of code words index and transmission mode information take
bit; Wherein, L represents that the maximum number of plies that system is supported, S represent the maximum codeword flow amount that system is supported,
represent and x is rounded up.
Further, above-mentioned communication system also can have following characteristics:
Described transmit leg, to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, is by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and streams of code words index corresponding to this recipient notifies this recipient.
I-th streams of code words in one group of streams of code words that described transmit leg uses this group recipient, after the mapped mode as each streams of code words before this streams of code words is determined, the kind of the possible mapped mode of this codeword current to layer as being greater than 1, is then used
the indication information of bit indicates the mapped mode of this codeword current to layer determined, by all indication informations of obtaining sequential combination by streams of code words, mapping pattern information as the codeword current to layer of recipient each in this group recipient sends, wherein i=1,2, ... I, I are the reception number formulary that this group recipient comprises
represent and x is rounded up.
Further, above-mentioned communication system also can have following characteristics:
Described transmit leg to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, be by
the indication information of bit notifies this recipient, wherein K is the species number sum of all possible mapped mode of each codeword current to layer that this recipient may use, and the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this recipient determined; Or
Described transmit leg is to matching each recipient carried out in one group of recipient of MU-MIMO transmission, be that the bitmap (bitmap) units being equaled the maximum number of plies that system is supported notifies this recipient, and in this Bitmap, the value of each bit position represent whether this recipient uses the layer corresponding to this.
In order to solve the problems of the technologies described above, present invention also offers 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 the communication system adopting demodulation pilot frequency (DMRS), comprising:
Transmit leg is under MU-MIMO transmission pattern, and one group of recipient that MU-MIMO transmission is carried out in pairing shares DMRS, according to the port number using the number of plies corresponding to the maximum recipient of the number of plies to determine DMRS; To each recipient in this group recipient, the mapping pattern information of the codeword current to layer of this recipient is notified this recipient by described transmit leg.
Further, above-mentioned Notification Method also can have following characteristics:
When described transmit leg carries out MU-MIMO, only identical to the number of plies used recipient matches, to matching each recipient carried out in one group of recipient of MU-MIMO transmission, this recipient of number of plies message notice that transmit leg will use in the resource of distributing for this group recipient.
Further, above-mentioned Notification Method also can have following characteristics:
The level that each recipient use in one group of recipient of MU-MIMO transmission is carried out in pairing is identical or different, to matching each recipient carried out in one group of recipient of MU-MIMO transmission, transmit leg sends the number of plies information of this recipient use by the control channel unit that this recipient is special, and do not use this recipient and the Resource Unit corresponding with the DMRS pilot frequency locations of other recipients use organized punches to data, or in this pilot frequency locations, data and DMRS pilot tone are carried out multiplexing.
Such scheme utilizes small signaling consumption for cost under notifying the maximum number of plies and layer demapping pattern at the same time, can improve the precision that MU-MIMO user carries out channel estimating, thus improves the detection perform to user data.In addition, orthogonal DMRS design, the mode that user can be made to utilize interference to eliminate carries out Data Detection, reduces the impact of inter-user interference.And constraint can under the equal pattern of the pairing user number of plies of MU-MIMO, then can again without any under the pattern of additional signaling overhead, solve DMRS design the MU-MIMO pattern caused under solution layer mapping problems.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the mapping method (normal CP) of existing CRS, wherein
represent the frequency pilot sign of antenna port 0 correspondence,
represent the frequency pilot sign of antenna port 1 correspondence,
represent the frequency pilot sign of antenna port 2 correspondence,
represent the frequency pilot sign of antenna port 3 correspondence.
Fig. 2 is the schematic diagram of PDCCH position in the frame structure in LTE.
Fig. 3 is the number of plies of UE1 when be 1, the UE2 number of plies being 2, under sharing DMRS situation, when only notifying respective user's number of plies, and the schematic diagram of the discernible DMRS position of different UEs, in figure,
the DMRS of presentation layer 0,
the DMRS of presentation layer 1.
Fig. 4 A is the schematic diagram that in a kind of MU-MIMO, different user flows to the mapping relations of layer, and in figure, CW1, CW2 represent 2 streams of code words, and S/P represents serioparallel exchange.
Fig. 4 B is under orthogonal DMRS pattern, when streams of code words (codeword stream) is known to the mapped mode of layer, by notifying total number of plies, and by 1bit instruction stream sequence number, and the schematic diagram of different UEs and the identifiable design DMRS of the layer of correspondence separately.In 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 layer.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
At MU-MIMO with based under the Data Detection pattern of DMRS, take transmit leg as eNodeB, recipient for UE be example, in other embodiments, transmit leg is eNB, Relay, HomeENB etc., and recipient can be UE, Relay etc.In the present embodiment, the process of transmitting of user data and pilot tone comprises:
Step one, UE carries out channel estimating according to CSI-RS, obtains CSI information, and feeds back to eNodeB;
In LTE-A, owing to defining CSI-RS, and the channel coefficients of all antenna ports to UE can be obtained based on CSI-RS, therefore, UE passes through channel estimating, can by the pattern of explicit (explicit) or implicit expression (implicit), by CSI information feed back to eNodeB.
Step 2, the CSI information that eNodeB feeds back according to UE, the UE for each scheduling selects suitable code modulation mode and pre-coding matrix, and under MU-MIMO pattern, eNodeB needs to select the good UE pairing of orthogonality further;
Step 3, the number of plies that each UE that eNodeB carries out MU-MIMO transmission according to pairing uses carries out layer mapping to the data of each UE;
Step 4, eNodeB carries out precoding processing respectively to the data of each UE matched respectively;
Example is multiplexed with 2 UE.Suppose that the UE of pairing is respectively UE1 and UE2 in a given resource, and pre-coding matrix corresponding to UE1 and UE2 is respectively P
1and P
2, and data waiting for transmission are respectively
with
wherein
represent l
ithe data vector of × 1 dimension, l
irepresent the number of plies that i-th UE is corresponding.ENodeB is right respectively
with
carry out precoding processing with precoding vectors, obtain
with
wherein
with
dimension be all N
tr× 1, N
trrepresent transmitting antenna port number.
The data of UE are carried out multiplexing process by step 5.Still to obtain after the data-reusing of two UE, UE1 and UE2 in step 4
Step 6, eNodeB selects DMRS according to UE1 and the UE2 number of plies separately, and uses P
1, P
2carry out precoding processing respectively, be inserted into the pilot frequency locations of each layer correspondence by through precoding processing DMRS according to pilot tone pattern afterwards, the DMRS between different layers is orthogonal;
No matter be the DMRS that different UEs shares each layer, still independently DMRS, different layers DMRS is all orthogonal, just when independently DMRS, needs more multi-layered DMRS.
When adopt share DMRS time, different UE adopts identical DMRS position and sequence, but to carry out precoding processing weights used to pilot tone different for different UEs, and by with the pilot superimposition after the weighting of different precoding weights.And different UEs is adopted to the situation of independent DMRS, (sequence is different for the DMRS difference of different UE, position also may be different (under when between user, DMRS adopts CDM multiplex mode, DMRS position between UE is identical, when DMRS between user adopts FDM, position is different)), now pilot tone is mapped on the pattern position of respective respective layer by different UEs respectively, carries out precoding processing.
Step 7, data and pilot tone are mapped on corresponding RB by eNodeB respectively, and carry out IFFT, add CP process and carry out up-conversion transmitting.
In embodiment one to embodiment six, the above-mentioned data handling procedure of transmit leg can refer to above-mentioned flow process, by the Notification Method of main describing layer map information in embodiment.Background technology has two kinds of patterns when describing MU-MIMO pattern: the DMRS of different UEs is non-orthogonal (sharing DMRS), or the DMRS of different UEs is orthogonal.In the first two embodiment, transmit leg is under MU-MIMO transmission pattern, and one group of recipient that MU-MIMO transmission is carried out in pairing shares DMRS, according to the port number using the number of plies corresponding to the maximum recipient of the number of plies to determine DMRS; In embodiment afterwards, transmit leg is under MU-MIMO transmission pattern, distribute orthogonal DMRS between one group of recipient that MU-MIMO transmission is carried out in pairing, the port number of the DMRS that the resource of distributing for this group recipient uses is the number of plies sum that this group recipient uses separately.In these embodiments, transmit leg, to each recipient in this group recipient, all needs the mapping pattern information of the codeword current to layer of this recipient to notify this recipient.
Embodiment one
In the present embodiment, multiple UE adopts nonopiate DMRS (DMRS shares) pattern.
The present embodiment is on the basis of above-mentioned data handling procedure, eNodeB need limit to be only had the identical UE of the number of plies of use to match to carry out MU-MIMO, each UE that MU-MIMO transmission is carried out in pairing adopts identical DMRS, pairing each UE, eNodeB carried out in one group of UE of MU-MIMO transmission is only needed to the number of plies information notifying to use in the resource of distributing for this group UE.
In such a mode, the reception treatment step of recipient is described for UE1.
Steps A, first UE1 receives control signal 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;
Mode is now with similar in LTE, and the pilot tone pattern of DMRS is mapped on layer, is aware of the number of plies, is also just aware of pilot tone pattern and frequency pilot sign.
If the pilot signal that the number of plies that transmit leg UE1 and UE2 uses is 2, UE1 reception is:
Wherein
represent the DMRS pilot signal sent, H
1represent the channel matrix of UE1.Due in pairing process, the P of selection
2be and H
1as far as possible orthogonal UE, i.e. H
1* P
2relative to the signal of UE1 be approximately 0 very little value.Then (3) formula is approximately
Wherein I is the interference brought pilot tone precoding by the precoding vector of UE2
Use y
pwith the conjugation of pilot signal
be multiplied, then can obtain the channel through precoding:.
Step 230, the pilot tone pattern corresponding according to DMRS number of plies information, UE carries out solution carrier wave to streams of code words and maps;
Step 240, the channel through pre-coding matrix process that UE channel estimating obtains
data are detected, and according to number of plies information, solution layer is carried out to the user data detected and maps, thus obtain transmission signal.
For UE2, processing procedure is the same.
Under above-mentioned processing mode, when the precoding vectors of UE2 and the channel of UE1 non-orthogonal time, interference can be produced to the Data Detection of UE1 and channel estimating.
Embodiment two
In the present embodiment, under multiple UE adopts nonopiate DMRS (DMRS shares) pattern, the UE number of plies of matching in MU-MIMO can be different.
If demodulation pilot frequency designs according to FDM pattern, the difference of the present embodiment and embodiment one is, to matching each UE carried out in one group of UE of MU-MIMO transmission, eNodeB sends the number of plies information of this UE use by means of only the control channel unit that this UE is special, and do not use at this UE and the RE corresponding with the DMRS pilot frequency locations of other UE use organized punches to data, or on this position, data and DMRS pilot tone are carried out multiplexing.
Under FDM pilot frequency multiplexing pattern, due to the existence of other layers of UE None-identified, current UE can be used as the pilot tone on oneself otiose layer oneself data processing, and the RE that now the DMRS pilot frequency locations that will not use in current UE of eNodeB is corresponding punches to data.To avoid producing interference to the pilot tone of other layers, or data and pilot superimposition are sent.
When punching or superposition send, the weights that the data of current UE use are determined by current UE, and the weights that DMRS adopts by the weights weighting using the UE of current layer corresponding namely: (P
1s+P
2p), wherein P
1and P
2for precoding weights or beam shape-endowing weight value (P
1for current UE, P
2pairing UE), s is the data of UE, and p is the frequency pilot sign of other layers that the RE of data s mapping is corresponding.And for the DMRS part shared, identical with embodiment one, the UE carrying out MU-MIMO is multiplexing to carrying out after pilot weighted with respective weights respectively.
The concrete process of recipient is compared with embodiment one, and except when carrying out solution carrier wave and mapping, the DMRS position that oneself can not use by the UE that the number of plies is few is outside being for data processing, and other operating procedures of UE side are identical.
Embodiment three
In the MU-MIMO of the present embodiment, different UE uses orthogonal DMRS.
A kind of advice method that the present embodiment proposes is, notifies total number of plies information that this group UE uses and the streams of code words index that this UE is corresponding to pairing each UE, eNodeB carried out in one group of UE of MU-MIMO transmission.
Total bit expense can be expressed as: total number of plies information takies
bit, wherein L represents the maximum number of plies that system is supported, streams of code words index takies
bit, is used to indicate the streams of code words that UE is corresponding.Wherein S represents the maximum codeword flow amount that system is supported,
represent and x is rounded up.When SU-MIMO and MU-MIMO adopts identical Downlink Control Information (DCI) form, streams of code words index and transmission mode information take
bit.
The maximum number of plies of supposing the system support is 8, and maximum codeword flow amount is 2, similar with embodiment two, conciliates layer mapping in order to UE can carry out carrier wave demapping effectively, now with total number of plies information of 3bit and the streams of code words index notice UE of 1bit.When SU-MIMO and MU-MIMO adopts identical DCI format, adopt the streams of code words index of 2bit.Total bit expense is 4 or 5bit.
UE can carry out solution carrier wave and map according to total number of plies information, simultaneously according to the layer mapping pattern information that total number of plies information and streams of code words index indicate, UE can obtain corresponding layer information and carry out the mapping of solution layer.And when SU-MU-MIMO adopts identical DCI pattern, need increase bit or use a residual state to indicate SU-MIMO, so-called residual state can be a kind of value do not used in DCI signaling, certain signaling as 3bit has 8 kinds of values, 8 states can be indicated, and this signaling only need use 6 states wherein, a remaining state just can be used to indicate SU-MIMO.
For the mapped mode of codeword current to layer shown in Fig. 5, total number of plies is 8, has at most 2 streams of code words CW1 and CW2, and the mapping number of plies that time multiplexing, these 2 streams of code words are total can be 2 ~ 8, the number of plies that CW1 maps is 1 ~ 4, corresponding to first to fourth layer, and the number of plies that CW2 maps also can be 1 ~ 4, is mapped to which layer relevant with the number of plies that CW1 maps, when the number of plies as CW1, CW2 mapping is respectively 2, CW1 is mapped to the 1st, 2 layers, and CW2 is mapped to the 3rd, 4 layer.Figure middle level 2, the grid below layer 3 and layer 4 represents single codeword stream situation in SU-MIMO.Because the mapped mode of codeword current to layer is fixed, after the streams of code words index being aware of oneself as UE and total number of plies, can according to the two each self-corresponding layer information of mapped mode acquisition sending out known of transmitting-receiving.
As shown in Fig. 4 (a), suppose that the pilot tone of UE1 and UE2 is mapped to layer 1 respectively, 2 and layer 3,4.And the layer mapped mode UE of correspondence known when, first total number of plies information is obtained by total number of plies indication information (3bit), now total number of plies information is 4, and then by streams of code words index (1bit), the streams of code words that current UE is corresponding can be obtained, thus the layer mapped mode that this UE is concrete can be known.
Other processing procedures are not in repetition.
Embodiment four
In the MU-MIMO of the present embodiment, different UE uses orthogonal DMRS.
The Notification Method of a kind of layer of map information that the present embodiment proposes is: to matching each UE carried out in one group of UE of MU-MIMO transmission, eNode needs the mapping pattern information of the codeword current to layer notifying each UE in this group UE, and the streams of code words index that this UE is corresponding.
Particularly, the species number m of the layer mapped mode that streams of code words CW1 is possible is first considered
1during > 1, the layer mapped mode of instruction CW1 needs
bit; When each layer mapped mode of streams of code words CW1 is determined, the mapping range 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
2during > 1, indicate during the layer mapped mode of CW2 and need
bit; By that analogy, until under all fixed modes of code word fluid layer mapped mode all above, to the streams of code words CWi that the species number of last possible layer mapped mode is greater than 1, the layer mapped mode of instruction CWi needs
bit.Can the species number of the ergosphere mapped mode streams of code words that equals 1 can determine without the need to taking bit instruction.Like this, the mapping pattern information carrying out all streams of code words of one group of UE of MU-MIMO transmission that matches need take
bit.
Now suppose that MU-MIMO data send the layer mapped mode that use as shown in the situation of streams of code words two in Fig. 5, for each UE, the streams of code words of its correspondence may, corresponding to the CW1 in Fig. 5, also may be CW2.In NodeB side, when UE1 corresponds to CW1, possible mapped mode has 4 kinds.Wherein correspond to the mapped mode of each CW1, except the situation that the number of plies is 8, the mapped mode of CW2 all has 2 kinds, therefore can with 3 bit marker mapped modes.Wherein 2bit (MSB (bit's is high 2) or LSB (low 2 in bit sequence)) indicates the mapped mode of CW1, and when 1bit determines under indicating CW1 mapped mode, CW2 maps corresponding to two kinds of patterns any.
Which layer be applicable to below maps and maps by front layer the scene restricted, and simultaneously with the streams of code words index that an a bit or residual state instruction UE is corresponding, now layer maps the same needs of notice 3 ~ 4bit.As shown in Figure 5, according to mapped mode above, suppose streams of code words 1 2bit, at least 2 layers in MU-MIMO, the mapped mode of streams of code words 1 has 4 kinds, represents with 2bit, such as represent that streams of code words 1 has been mapped to the situation of 2 layers with 01, then 4layer and 5layer situation in corresponding diagram, in both cases, the mapped mode of streams of code words 1 is identical, and streams of code words 2 is different, and then the situation of specifically layer4 or layer5 can be determined with 1bit, be such as 0, then correspond to layer4 scene.If there is the streams of code words index that 1bit or state indicate current UE corresponding again, be such as 1, then current UE can know that oneself correspondence is streams of code words 2, and then can determine oneself to correspond to 3,4 layers.
After knowing the layer mapped mode oneself used, UE can process based on the mode of embodiment one, completes data receiver.
Embodiment five
In the MU-MIMO of the present embodiment, different UE uses orthogonal DMRS.
Similar to embodiment four, the Notification Method of a kind of layer of map information that the present embodiment proposes is: pairing is carried out to each UE, eNode notice in one group of UE of MU-MIMO transmission
the indication information of bit, K is the species number sum of all possible mapped mode of each codeword current to layer that this UE may use, and the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this UE determined.
Now suppose that MU-MIMO data send the layer mapped mode that use as shown in the situation of streams of code words two in Fig. 5, for each UE, the streams of code words of its correspondence may, corresponding to the CW1 in Fig. 5, also may be CW2.In NodeB side, when UE1 corresponds to CW1, possible mapped mode has 4 kinds, and when UE1 corresponds to CW2, possible is mapped with 7 kinds, totally 11 kinds.Then, total bit expense can be expressed as
According to
after the indication information of bit knows the layer mapped mode oneself used, UE can process based on the mode of embodiment one, completes data receiver.
Embodiment six
In the MU-MIMO of the present embodiment, different UE uses orthogonal DMRS.
The Notification Method of a kind of layer of map information that the present embodiment proposes is: to matching each UE carried out in one group of UE of MU-MIMO transmission, eNode notifies that a units equals the bitmap (bitmap) of the maximum number of plies that system is supported, in this Bitmap, the value of each bit position represents whether this UE uses the layer corresponding to this.
After knowing according to Bitmap the layer mapped mode oneself used, UE can process based on the mode of embodiment one, completes data receiver.
This mode be applicable to each UE layer can random orthogonal map pattern.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a Notification Method for multi-user's multiple-input and multiple-output (MU-MIMO) pattern lower floor map information, is applied to the communication system adopting demodulation pilot frequency (DMRS), comprises:
Transmit leg is under MU-MIMO transmission pattern, and distribute orthogonal DMRS between one group of recipient that MU-MIMO transmission is carried out in pairing, the port number of the DMRS that the resource of distributing for this group recipient uses is the number of plies sum that this group recipient uses separately; To each recipient in this group recipient, the mapping pattern information of the codeword current to layer of this recipient is notified this recipient by described transmit leg;
The mapping pattern information of the codeword current to layer of this recipient is notified this recipient by wherein said transmit leg, is specially any one in following manner:
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is the total number of plies information this group recipient used, and streams of code words index corresponding to this recipient notifies this recipient; Or
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and streams of code words index corresponding to this recipient notifies this recipient; Or
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg be by
indication information notify this recipient, wherein K is the species number sum of all possible mapped mode of each codeword current to layer that this recipient may use, and the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this recipient determined; Or
To matching each recipient carried out in one group of recipient of MU-MIMO transmission, described transmit leg is that the bitmap (bitmap) units being equaled the maximum number of plies that system is supported notifies this recipient, and in this Bitmap, the value of each bit position represents whether this recipient uses the layer corresponding to this.
2. Notification Method as claimed in claim 1, is characterized in that:
When to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is the total number of plies information this group recipient used, and when streams of code words index corresponding to this recipient notifies this recipient,
Single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern adopt different descending control information formats, and described total number of plies information takies
streams of code words index takies
or single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern adopt identical descending control information format, described total number of plies information takies
streams of code words index and transmission mode information take
wherein, L represents that the maximum number of plies that system is supported, S represent the maximum codeword flow amount that system is supported,
represent and x is rounded up.
3. Notification Method as claimed in claim 1, is characterized in that:
When to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and when streams of code words index corresponding to this recipient notifies this recipient,
I-th streams of code words in the one group of streams of code words use this group recipient, after the mapped mode as each streams of code words before this streams of code words is determined, the kind of the possible mapped mode of this codeword current to layer as being greater than 1, is then used
indication information indicate the mapped mode of this codeword current to layer determined, by all indication informations of obtaining sequential combination by streams of code words, mapping pattern information as the codeword current to layer of recipient each in this group recipient sends, wherein i=1,2, I, I are the reception number formulary that this group recipient comprises
represent and x is rounded up.
4. a Notification Method for multi-user's multiple-input and multiple-output (MU-MIMO) pattern lower floor map information, is applied to the communication system adopting demodulation pilot frequency (DMRS), comprises:
Transmit leg is under MU-MIMO transmission pattern, and one group of recipient that MU-MIMO transmission is carried out in pairing shares DMRS, according to the port number using the number of plies corresponding to the maximum recipient of the number of plies to determine DMRS; To each recipient in this group recipient, the mapping pattern information of the codeword current to layer of this recipient is notified this recipient by described transmit leg;
The mapping pattern information of the codeword current to layer of this recipient is notified this recipient by wherein said transmit leg, refers to any one in following manner:
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is the total number of plies information this group recipient used, and streams of code words index corresponding to this recipient notifies this recipient; Or
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg is by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and streams of code words index corresponding to this recipient notifies this recipient; Or
To matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, described transmit leg be by
indication information notify this recipient, wherein K is the species number sum of all possible mapped mode of each codeword current to layer that this recipient may use, and the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this recipient determined; Or
To matching each recipient carried out in one group of recipient of MU-MIMO transmission, described transmit leg is that the bitmap (bitmap) units being equaled the maximum number of plies that system is supported notifies this recipient, and in this Bitmap, the value of each bit position represents whether this recipient uses the layer corresponding to this.
5. Notification Method as claimed in claim 4, is characterized in that:
When described transmit leg carries out MU-MIMO, only identical to the number of plies used recipient matches, to matching each recipient carried out in one group of recipient of MU-MIMO transmission, this recipient of number of plies message notice that transmit leg will use in the resource of distributing for this group recipient.
6. Notification Method as claimed in claim 4, is characterized in that:
The level that each recipient use in one group of recipient of MU-MIMO transmission is carried out in pairing is identical or different, to matching each recipient carried out in one group of recipient of MU-MIMO transmission, transmit leg sends the number of plies information of this recipient use by the control channel unit that this recipient is special, and do not use this recipient and the Resource Unit corresponding with the DMRS pilot frequency locations of other recipients use organized punches to data, or in this pilot frequency locations, data and DMRS pilot tone are carried out multiplexing.
7. one kind adopts the communication system of multi-user's multiple-input and multiple-output (MU-MIMO) pattern, comprise the transmit leg for sending user data and demodulation pilot frequency (DMRS), and for receiving the recipient of user data and DMRS, it is characterized in that:
Described transmit leg is under MU-MIMO transmission pattern, and the one group of recipient carrying out MU-MIMO transmission for pairing adopts orthogonal DMRS, and the port number of the DMRS that the resource of distributing for this group recipient uses is the number of plies sum that this group recipient uses separately; To each recipient in this group recipient, the mapping pattern information of the codeword current to layer of this recipient is notified this recipient by described transmit leg;
Described recipient, according to the mapping pattern information of the described codeword current to layer received, carries out channel estimating to each layer, and carries out the mapping of solution carrier wave mapping reconciliation layer to streams of code words;
The mapping pattern information of the codeword current to layer of this recipient is notified this recipient by wherein said transmit leg, refers to any one in following manner:
Described transmit leg, to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, is the total number of plies information this group recipient used, and streams of code words index corresponding to this recipient notifies this recipient; Or
Described transmit leg, to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, is by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and streams of code words index corresponding to this recipient notifies this recipient; Or
Described transmit leg to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, be by
indication information notify this recipient, wherein K is the species number sum of all possible mapped mode of each codeword current to layer that this recipient may use, and the state of this indication information is corresponding to the mapped mode of the codeword current to layer of this recipient determined; Or
Described transmit leg is to matching each recipient carried out in one group of recipient of MU-MIMO transmission, be that the bitmap (bitmap) units being equaled the maximum number of plies that system is supported notifies this recipient, and in this Bitmap, the value of each bit position represent whether this recipient uses the layer corresponding to this.
8. communication system as claimed in claim 7, is characterized in that:
When described transmit leg is to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, be total number of plies information that this group recipient is used, and when streams of code words index corresponding to this recipient notifies this recipient,
Described transmit leg adopts different descending control information formats to single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern, and described total number of plies information takies
streams of code words index takies
or described transmit leg adopts identical descending control information format to single user multiple-input and multiple-output (SU-MIMO) pattern and MU-MIMO pattern, total number of plies information takies
streams of code words index and transmission mode information take
wherein, L represents that the maximum number of plies that system is supported, S represent the maximum codeword flow amount that system is supported,
represent and x is rounded up.
9. communication system as claimed in claim 7, is characterized in that:
When described transmit leg is to matching each recipient of carrying out in one group of recipient of MU-MIMO transmission, be by the mapping pattern information of the codeword current to layer of recipient each in this group recipient, and when streams of code words index corresponding to this recipient notifies this recipient,
I-th streams of code words in one group of streams of code words that described transmit leg uses this group recipient, after the mapped mode as each streams of code words before this streams of code words is determined, the kind of the possible mapped mode of this codeword current to layer as being greater than 1, is then used
indication information indicate the mapped mode of this codeword current to layer determined, by all indication informations of obtaining sequential combination by streams of code words, mapping pattern information as the codeword current to layer of recipient each in this group recipient sends, wherein i=1,2, I, I are the reception number formulary that this group recipient comprises
represent and x is rounded up.
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