CN103916210A - Data processing method, system and device for coordinated multi-point transmission system - Google Patents
Data processing method, system and device for coordinated multi-point transmission system Download PDFInfo
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Abstract
The invention discloses a data processing method, system and device for a coordinated multi-point transmission system. The data processing method comprises the steps that UE demodulates a data signal from the received signal under a transparent mode; on the current RE, if a first coordination cell capable of transmitting data to the UE and a second coordination cell incapable of transmitting data to the UE exist in a coordination cluster, the data signal of the UE and an equivalent data signal from the second coordination cell to the UE are transmitted in the first coordination cell according to channel information from the first coordination cell to the UE and channel information from the second coordination cell to the UE, wherein the result generated when the equivalent data signal reaches to the UE through a channel from the first coordination cell to the UE is identical to the result generated when the data signal of the UE reaches to the UE through a channel from the second coordination cell to the UE if the data signal of the UE is transmitted in the second coordination cell. By means of the data processing method, system and device for the coordinated multi-point transmission system, receiving performance of the UE can be improved.
Description
Technical field
The application relates to mobile communication technology field, relates in particular to a kind of data processing method for cooperative multicast system, system and device.
Background technology
Cooperative multipoint transmission (Coordinated Multiple Points, CoMP) refer to, the multiple transfer points that separate on geographical position, collaborative participation is the transfer of data of a terminal or the data of combining a terminal transmission of reception, and the multiple transfer points that participate in cooperation are often referred to the base station of different districts.Adopt CoMP technology can reduce presence of intercell interference, promote the spectrum efficiency of Cell Edge User.
In the system of having applied CoMP technology, (be called for short CoMP system), upper when the Resource Unit (ResourceElement, RE) identical, when co-operating community all sends data-signal to same user i, this RE can be called clear data RE.User i can use h to the down channel matrix of community j
ijrepresent, the signal that user i receives on clear data RE is:
Wherein: N represents the community number of cooperation; M represents the number of users of pairing, belongs to cooperation cell and in synchronization and same asset, receives the number of users of data; h
ijrepresent the down channel matrix of user i to community j, i user is expressed as to the combined channel of the interior all communities of cooperative cluster: H
i=[h
i1h
iN]; w
ijthe part that the precoding of expression user i sends in j community, i user associating pre-coding matrix in all communities in cooperative cluster is expressed as:
Associating pre-coding matrix to all customer data in the j of community is expressed as: [w
1jw
mj]; S
irepresent i user's data; I
outside bunchrepresent cooperation cell interference in addition, n represents noise.
In 3GPP Rel-10 standard, define transmission mode 9, this transmission mode is for supporting the alone family beam shaping of maximum 8 streams and the multi-user beam excipient of maximum 4 streams, and use special demodulated reference signal (Demodulation Reference Signal, DMRS) to carry out the receiving demodulation of data.Because DMRS signal uses the precoding weighting identical with data-signal, can utilize so the equivalent channel that DMRS channel estimating obtains to carry out demodulation to user's reception data.
Therefore,, when introduce CoMP technology in described transmission mode 9 time, can utilize the data S of the equivalent channel demodulation user i that DMRS channel estimating obtains
i.
But, in some situation, existing co-operating each community on same RE is not the situation that all sends data-signal, on a RE, some community sends data-signal, and other communities send other signals, such as CRS signal or PDCCH signal, this goes wrong the data receiver that causes UE, specifically refers to Fig. 1 and Fig. 2.
Fig. 1 is the cooperation schematic diagram of two cooperation cell in CoMP system.
As shown in Figure 1, community 1 and community 2 are two co-operating communities in CoMP transmission, wherein, user 1 belongs to community 1, user 2 belongs to community 2, and user 1 can receive the data from community 1 and community 2 simultaneously, and user 2 also can receive the data from community 1 and community 2 simultaneously.
Fig. 2 is the RE mapping relations figure of downlink system in CoMP system.
As shown in Figure 2, wherein suppose that the Physical Downlink Control Channel (Physical Downlink ControlChannel, PDCCH) of community 1 takies front 2 OFDM symbols, the PDCCH of community 2 takies front 3 OFDM symbols.The RE that public reference signal (Cell-specific Reference Signals, CRS) and DMRS signal take as shown in Figure 2.There is the frequency shift (FS) of minizone in the RE taking due to CRS, so suppose that the CRS signal of adjacent Liang Ge community takies respectively different subcarriers on frequency domain.
In Fig. 2, community 1 and community 2 are respectively W to the weighted value of data S
1and W
2, the each self-supporting user in community 1 and community 2 sends the data after weighting, is expressed as W
1s and W
2s.Channel between community 1 and community 2 and user is expressed as H
1and H
2, the signal that community 1 and community 2 send is so through channel H
1and H
2while arriving user side, be expressed as H
1w
1s and H
2w
2s.
As seen from Figure 2, on the clear data RE of position C, arrive user side and according to number be:
y=(H
1W
1+H
2W
2)S。
UE utilizes the channel matrix z that DMRS channel estimating obtains can demodulate data S:S=y/z, wherein, and z=H
1w
1+ H
2w
2.
But on the RE of the A of position shown in Fig. 2 and the RE of position B, what send due to community 2 is CRS signal or PDCCH signal, rather than sends data W2S, arrive so user side and according to number be:
y′=H
1W
1S+H
2x
CRS。
Now, UE cannot directly utilize y '/z to obtain S, this be because, if now UE still gives tacit consent to and adopts the mode demodulate reception data of y '/z, demodulation result is S '=y '/z, the S ' now obtaining will be no longer S, therefore will occur data demodulates mistake.
The RE mapping relations of Fig. 2 are only for exemplarily, its object is explanation, Dang Zhe community is for sending the RE of data, adjacent cell (is assumed to be adjacent cell and k) sends other non-data-signals such as CRS signal or control channel PDCCH signal, and while not sending data-signal, the reception signal of user i on this class RE will be expressed as:
Now, user i cannot utilize the equivalent channel h that DMRS channel estimating obtains
i1w
i1+ ... + h
iNw
iNdemodulate the useful signal s of reception
i.
That is to say, in CoMP system, when part community on same RE, co-operating community sends data-signal, and residue community is while sending non-data-signal, and the receiving signal demodulation of user's side will go wrong.
In order to address this problem, can directly process the adjacent area that sends CRS/ control channel at present, only send the superposition of data of CRS/ control channel or transmission weighting CRS/ control channel after treatment and data.But because receiving terminal thinks that this RE position transmitted data, so only send the method for CRS and can have influence on the receptivity of UE; If send in addition CRS/ control channel and data simultaneously, can cause interference to a certain degree to CRS/ control channel, thereby affect the non-CoMP user's in adjacent area channel estimating and control channel receptivity.
Visible, the transmission mode of 3GPP the 10th version (Rel-10) standard 9 times, how to realize the receptivity that CoMP technology could improve UE and remain one of current technical problem of needing solution badly.
At present, can also utilize for 9 times multicast and broadcast (Multicast Broadcast SingleFrequency Network, MBSFN) subframe to carry out CoMP transmission in described transmission mode.This be because, in MBSFN subframe, CRS signal only sends in PDCCH, that is to say that CRS signal only takies front 1～2 OFDM symbol, in OFDM symbol below, do not send CRS signal, thereby avoided on same RE part community to send data-signal and other communities send the situation of non-data-signal, and then can avoid the problem of corresponding UE receptivity.But, in TDD ascending-descending subframes is configured to 1 system, only there are the 4th and 9 work song frames can be configured to MBSFN subframe, the scheme of therefore utilizing MBSFN subframe to carry out CoMP transmission exists the problem lower to the utilance of subframe.
Summary of the invention
The application provides a kind of data processing method for cooperative multicast system, system and device, can improve the receptivity of UE.
For a data processing method for cooperative multicast system, the method comprises:
User equipment (UE) receives the signal that all cooperation cell in this UE place cooperative cluster send, estimate the channel information of all cooperation cell to this UE according to demodulated reference signal DMRS, UE gives tacit consent in the signal that each cooperation cell sends and includes data-signal, and demodulates data-signal the signal receiving from this UE to the channel information of this UE according to all cooperation cell;
The method also comprises:
On current Resource Unit RE; send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE if existed in cooperative cluster to user equipment (UE); according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE;
Wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, and described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE;
Wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
A kind of cooperative multicast system, this system comprises user equipment (UE) and network equipment;
Described UE, the signal sending for all cooperation cell that receive in this UE place cooperative cluster, estimate the channel information of all cooperation cell to this UE according to demodulated reference signal DMRS, UE gives tacit consent in the signal that each cooperation cell sends and includes data-signal, and demodulates data-signal the signal receiving from this UE to the channel information of this UE according to all cooperation cell;
Described network equipment; be used at current RE; send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE if existed in cooperative cluster to user equipment (UE); according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE;
Wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, and described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE;
Wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
For a data processing equipment for cooperative multicast system, this device comprises identification module and sending module;
Whether described identification module, for being identified in current RE, exist in cooperative cluster to UE and send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE;
Described sending module, for identifying at current RE at described identification module, in cooperative cluster, there is the first cooperation cell that sends data to UE, and exist while not sending the second cooperation cell of data to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE, wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
Visible, in technical scheme provided by the invention, in the situation that UE is transparent, be that UE gives tacit consent to all cooperation cell all to this UE transmission data-signal, channel information according to the each cooperation cell of DMRS Signal estimation receiving to this UE, then the signal receiving from this UE to the channel information of this UE according to all cooperation cell, demodulate data-signal, improve by the action that network side is sent to data, improve the receptivity of UE.
Particularly, on current RE, if there is the first cooperation cell that sends data to user equipment (UE) in cooperative cluster, and there is the second cooperation cell that does not send data to described UE, according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE, wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
Visible, result when described equivalent data signal arrives described UE by the first cooperation cell to the channel of described UE, if with the data-signal that sends described UE in the second cooperation cell, the coming to the same thing when data-signal of described UE arrives described UE by the second cooperation cell to the channel of described UE, by send the equivalent data signal of the second cooperation cell to described UE in the first cooperation cell, realize by the first cooperation cell and simulated the second cooperation cell to described UE transmission data-signal, it seems from UE side, what UE received sends data-signal after UE reception with data identical to this UE with data and each cooperation cell on clear data RE, therefore, UE still can demodulate data-signal according to the channel information of all cooperation cell.And in the prior art, on described current RE, do not send data-signal in the second cooperation cell and in the first cooperation cell, only send the data-signal that the first cooperation cell should send self yet, what therefore UE received send data-signal after this UE reception to this UE with data and each cooperation cell on clear data RE with data is different, now because UE is transparent, therefore UE is still according to the channel information demodulated data signal of all cooperation cell, and obviously the receptivity of UE can be affected.Visible, by contrast, data processing method provided by the invention can obviously improve the receptivity of UE.
Further, because the present invention does not need to send data-signal in the second cooperation cell, with in prior art second cooperation cell send data-signal compare with CRS/ control channel, also can not cause interference to CRS/ control channel, and then can not affect non-CoMP user's channel estimating and the receptivity of control channel.
Again further, while adopting data processing method provided by the invention, not only can in MBSFN subframe, carry out CoMP transmission, can also in other subframes, carry out CoMP transmission, therefore, also can improve the utilance to subframe.
Accompanying drawing explanation
Fig. 1 is the cooperation schematic diagram of two cooperation cell in CoMP system.
Fig. 2 is the RE mapping relations figure of downlink system in CoMP system.
Fig. 3 is the data processing method flow chart for cooperative multicast system provided by the invention.
Fig. 4 is the composition schematic diagram of cooperative multicast system provided by the invention.
Fig. 5 is the data processing equipment structure chart for cooperative multicast system provided by the invention.
Embodiment
Fig. 3 is the data processing method flow chart for cooperative multicast system provided by the invention.
As shown in Figure 3, the method comprises:
Step 301, network equipment identifies on current RE, exists to user equipment (UE) and send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE in cooperative cluster.
Step 302, network equipment according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE.
Wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE, and described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
Visible, result when described equivalent data signal arrives described UE by the first cooperation cell to the channel of described UE, if with the data-signal that sends described UE in the second cooperation cell, the coming to the same thing when data-signal of described UE arrives described UE by the second cooperation cell to the channel of described UE.
Step 303, UE receives the signal that all cooperation cell in this UE place cooperative cluster send, according to demodulated reference signal DMRS estimate that all cooperation cell are to the channel information of this UE, the signal receiving from this UE to the channel information of this UE according to all cooperation cell, demodulate data-signal.
In this step, UE gives tacit consent in the signal that each cooperation cell sends and includes data-signal, and demodulates data-signal the signal receiving from this UE to the channel information of this UE according to all cooperation cell.
Particularly, UE obtains in all cooperation cell the channel matrix H of i cooperation cell to this UE
ibe multiplied by the data precoding matrix W of i cooperation cell on clear data RE
ithe product H of gained
iw
icumulative sum
wherein, n is total number of cooperation cell, the signal receiving, demodulates data-signal according to described cumulative sum from this UE.
In this step, for the non-data-signal sending in the second cooperation cell, UE, in the time carrying out demodulated data signal, can process described non-data-signal as interference signal.
From method described in Fig. 3, by step 302, the first cooperation cell is except sending the data-signal of this UE that should be sent by this first cooperation cell, also realize by the first cooperation cell and simulated the second cooperation cell to described UE transmission data-signal, it seems from UE side, what UE received sends data-signal after UE reception with data identical to this UE with data and each cooperation cell on clear data RE, therefore, when UE in step 303 is during still according to the channel information demodulated data signal of all cooperation cell, can guarantee the receptivity of UE.
In actual applications, be when more than two if the number of the first cooperation cell is two numbers above and/or the second cooperation cell, network equipment can be determined the second cooperation cell that each the first cooperation cell need to be simulated, all the second cooperation cell are all simulated by first cooperation cell, then for each single the first cooperation cell, the equivalent data signal that is clipped to described UE is divided in all the second cooperation cell that need simulation that not only send the data-signal of described UE, also send this single the first cooperation cell.
Send the data-signal of UE and the second cooperation cell to the equivalent data signal of UE in the first cooperation cell time, need according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE.
Particularly, when sending the data-signal of UE by the second cooperation cell, the data-signal of UE is to arrive described UE's via the second cooperation cell to the channel of described UE, and while sending the equivalent data signal of the second cooperation cell by the first cooperation cell, this equivalence data-signal is to arrive described UE's via the first cooperation cell to the channel of described UE, therefore the data-signal and the second cooperation cell that, in the first cooperation cell, send described UE specifically can comprise to the equivalent data signal of described UE:
Obtain the product result to the channel matrix gained of described UE divided by the first cooperation cell again that is multiplied by the data precoding matrix gained of described the second cooperation cell on clear data RE to the channel matrix of described UE in the second cooperation cell, using the result of gained as the equivalent data pre-coding matrix of being simulated the second cooperation cell by the first cooperation cell and send the data-signal of UE, then on the basis of the data precoding matrix on clear data RE, add the above equivalent data pre-coding matrix in the first cooperation cell, using gained add with result as the first cooperation cell the data precoding matrix on current RE, utilize the data precoding matrix of described the first cooperation cell on current RE to be weighted the data-signal of UE, in the first cooperation cell, send weighted results, or, utilize the data precoding matrix of the first cooperation cell on clear data RE to be weighted and to obtain the first weighted results the data-signal of UE, utilize described equivalent data pre-coding matrix to be weighted and to obtain the second weighted results the data-signal of UE, in the first cooperation cell, send the first weighted results and the second weighted results.
For two concrete examples, data processing method provided by the invention is carried out to exemplary introduction below:
Suppose on current RE, community c sends data to object UE, and community k sends the non-data-signals such as CRS signal or control signal to described object UE, wherein, community c can be the main Serving cell of described object UE, can be also other communities that send data to described object UE in cooperative cluster.
On clear data RE, the data precoding matrix that community c adopts in the time that described object UE sends data is W
c, the data precoding matrix that community k adopts in the time that described object UE sends data is W
k, in the present invention, on described current RE, the data precoding matrix modifications that community c is adopted to described object UE transmission data is:
Wherein, h
ikthe channel matrix of community k to described object UE, h
icthe channel matrix of community c to described object UE.Due in CoMP transmission, can shared channel information between each cooperation cell in cooperative cluster, therefore community c can obtain the down channel matrix h of community k to described object UE
ik.
Therefore, the data-signal of supposing UE is S, and the data after the weighting that community c sends to described object UE should be:
Data after the weighting sending to described object UE due to community c need to arrive UE to the channel of described object UE via community c, and community c is h to the channel matrix of described object UE
ic, therefore, the signal from community c that described Target cell receives should be:
Visible, by revising the data precoding matrix of community c, realize Liao You community c simulation community k and send data-signal to object UE,, make signal that object UE receives identical with the signal that this object UE receives in the time that clear data REShang community c and community k send data-signal to this object UE respectively, therefore, UE can demodulate data-signal according to utilizing DMRS signal to carry out the equivalent channel matrix that channel estimating obtains, wherein, the non-data-signal sending for community k, described object UE can be considered described non-data-signal as disturbing.
Continue the example of background technology partial graph 2, in the time adopting data processing method provided by the invention, on position A and position B, send the data-signal that should be sent by community 2 by community 1 simultaneously, make that user receives with data be still y.Particularly, the data precoding matrix W to community 1
1modify, become W
1'=(H
1w
1+ H
2w
2)/H
1, pass through so channel H
1after, the signal that arrives user side is:
H
1W
1'S=H
1S(H
1W
1+H
2W
2)/H
1=S(H
1W
1+H
2W
2)=y。
Now user can utilize y/z to obtain data-signal S, wherein, and z=H
1w
1+ H
2w
2.
Visible, adopt the present invention, can under the transparent pattern of UE, realize CoMP transmission, and guarantee the receptivity of UE.And the present invention, except can applying in MBSFN subframe, can also apply in the normal sub-frames beyond MBSFN subframe, and therefore the present invention can improve the utilance of subframe.
According to said method provided by the invention, the present invention also provides corresponding cooperative multicast system and the data processing equipment for cooperative multicast system, specifically refers to Fig. 4 and Fig. 5.
Fig. 4 is the composition schematic diagram of cooperative multicast system provided by the invention.
As shown in Figure 4, this system comprises UE401 and network equipment 402.
UE401, the signal sending for all cooperation cell that receive in this UE401 place cooperative cluster, estimate the channel information of all cooperation cell to this UE401 according to demodulated reference signal DMRS, the signal receiving from this UE401 to the channel information of this UE401 according to all cooperation cell, demodulate data-signal, wherein, UE401 gives tacit consent in the signal that each cooperation cell sends and includes data-signal, and demodulates data-signal the signal receiving from this UE to the channel information of this UE according to all cooperation cell.
Network equipment 402, be used at current RE, if there is the first cooperation cell that sends data to UE401 in cooperative cluster, and there is the second cooperation cell that does not send data to UE, according to the first cooperation cell to the channel information of UE401 and the second cooperation cell the channel information to UE401, in the first cooperation cell, send the data-signal of UE401 and the second cooperation cell equivalent data signal to UE401, wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE, wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
Wherein, network equipment 402, can be for being more than two in the number of the first cooperation cell and/or the number of the second cooperation cell is when more than two, determine the second cooperation cell that each the first cooperation cell need to be simulated, all the second cooperation cell are all simulated by first cooperation cell, divide at single the first data-signal of cooperation cell transmission UE401 and all second cooperation cell that need simulation of this single the first cooperation cell the equivalent data signal that is clipped to UE401.
Network equipment 402, can be for obtaining the product result to the channel matrix gained of UE401 divided by the first cooperation cell again that be multiplied by the data precoding matrix gained of described the second cooperation cell on clear data RE to the channel matrix of UE401 in the second cooperation cell, using the result of gained as the equivalent data pre-coding matrix of being simulated the second cooperation cell by the first cooperation cell and send the data-signal of UE401, on the basis of the data precoding matrix in the first cooperation cell on clear data RE, add the above equivalent data pre-coding matrix, using gained add with result as the first cooperation cell the data precoding matrix on current RE, utilize the data precoding matrix of described the first cooperation cell on current RE to be weighted the data-signal of UE401, in the first cooperation cell, send weighted results, or, utilize the data precoding matrix of the first cooperation cell on clear data RE to be weighted and to obtain the first weighted results the data-signal of UE401, utilize described equivalent data pre-coding matrix to be weighted and to obtain the second weighted results the data-signal of UE401, in the first cooperation cell, send the first weighted results and the second weighted results, wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
Fig. 5 is the data processing equipment structure chart for cooperative multicast system provided by the invention.
As shown in Figure 5, this device comprises identification module 501 and sending module 502.
Whether identification module 501, for being identified in current RE, exist in cooperative cluster to UE and send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE.
Sending module 502, for identifying at current RE at identification module 501, in cooperative cluster, there is the first cooperation cell that sends data to UE, and exist while not sending the second cooperation cell of data to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE, wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
Wherein, sending module 502, for obtaining the product result to the channel matrix gained of described UE divided by the first cooperation cell again that is multiplied by the data precoding matrix gained of described the second cooperation cell on clear data RE to the channel matrix of described UE in the second cooperation cell, using the result of gained as the equivalent data pre-coding matrix of being simulated the second cooperation cell by the first cooperation cell and send the data-signal of UE, on the basis of the data precoding matrix in the first cooperation cell on clear data RE, add the above equivalent data pre-coding matrix, using gained add with result as the first cooperation cell the data precoding matrix on current RE, utilize the data precoding matrix of described the first cooperation cell on current RE to be weighted the data-signal of UE, in the first cooperation cell, send weighted results, or, utilize the data precoding matrix of the first cooperation cell on clear data RE to be weighted and to obtain the first weighted results the data-signal of UE, utilize described equivalent data pre-coding matrix to be weighted and to obtain the second weighted results the data-signal of UE, in the first cooperation cell, send the first weighted results and the second weighted results, wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. for a data processing method for cooperative multicast system, the method comprises:
User equipment (UE) receives the signal that all cooperation cell in this UE place cooperative cluster send, estimate the channel information of all cooperation cell to this UE according to demodulated reference signal DMRS, UE gives tacit consent in the signal that each cooperation cell sends and includes data-signal, and demodulates data-signal the signal receiving from this UE to the channel information of this UE according to all cooperation cell;
It is characterized in that, the method also comprises:
On current Resource Unit RE; send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE if existed in cooperative cluster to user equipment (UE); according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE;
Wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, and described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE;
Wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
2. method according to claim 1, is characterized in that, the data-signal and the second cooperation cell that in the first cooperation cell, send described UE comprise to the equivalent data signal of described UE:
Be more than two and/or the number of the second cooperation cell is when more than two in the number of the first cooperation cell, determine the second cooperation cell that each the first cooperation cell need to be simulated, all the second cooperation cell are all simulated by first cooperation cell;
Single the first cooperation cell sends the data-signal of described UE and the equivalent data signal that is clipped to described UE is divided in all second cooperation cell that need simulation of this single the first cooperation cell.
3. method according to claim 1 and 2, is characterized in that, the data-signal and the second cooperation cell that in the first cooperation cell, send described UE comprise to the equivalent data signal of described UE:
On the basis of the data precoding matrix in the first cooperation cell on clear data RE, add the above equivalent data pre-coding matrix, using gained add with result as the first cooperation cell the data precoding matrix on current RE, utilize the data precoding matrix of described the first cooperation cell on current RE to be weighted the data-signal of UE, in the first cooperation cell, send weighted results
Or, utilize the data precoding matrix of the first cooperation cell on clear data RE to be weighted and to obtain the first weighted results the data-signal of UE, utilize described equivalent data pre-coding matrix to be weighted and to obtain the second weighted results the data-signal of UE, in the first cooperation cell, send the first weighted results and the second weighted results.
4. method according to claim 1, is characterized in that, demodulates data-signal comprise according to all cooperation cell to the channel information of this UE from this UE the signal receiving:
Obtain in all cooperation cell the channel matrix H of i cooperation cell to this UE
ibe multiplied by the data precoding matrix W of i cooperation cell on clear data RE
ithe product H of gained
iw
icumulative sum
wherein, n is total number of cooperation cell;
The signal receiving from this UE according to described cumulative sum, demodulate data-signal.
5. according to the method described in claim 1 or 4, it is characterized in that, described in demodulate data-signal and comprise:
The non-data-signal that UE sends the second cooperation cell is processed as interference.
6. a cooperative multicast system, is characterized in that, this system comprises user equipment (UE) and network equipment;
Described UE, the signal sending for all cooperation cell that receive in this UE place cooperative cluster, estimate the channel information of all cooperation cell to this UE according to demodulated reference signal DMRS, UE gives tacit consent in the signal that each cooperation cell sends and includes data-signal, and demodulates data-signal the signal receiving from this UE to the channel information of this UE according to all cooperation cell;
Described network equipment; be used at current RE; send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE if existed in cooperative cluster to user equipment (UE); according to the first cooperation cell to the channel information of described UE and the second cooperation cell the channel information to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE;
Wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, and described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE;
Wherein, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
7. system according to claim 6, is characterized in that,
Described network equipment, for being more than two in the number of the first cooperation cell and/or the number of the second cooperation cell is when more than two, determine the second cooperation cell that each the first cooperation cell need to be simulated, all the second cooperation cell are all simulated by first cooperation cell, and the equivalent data signal that is clipped to described UE is divided in the second cooperation cell that send the data-signal of described UE and all needs simulations of this single the first cooperation cell in single the first cooperation cell.
8. according to the system described in claim 6 or 7, it is characterized in that,
Described network equipment, be multiplied by the product result to the channel matrix gained of described UE divided by the first cooperation cell again of the data precoding matrix gained of described the second cooperation cell on clear data RE to the channel matrix of described UE for obtaining the second cooperation cell, using the result of gained as the equivalent data pre-coding matrix of data-signal of being simulated the second cooperation cell by the first cooperation cell and send UE, on the basis of the data precoding matrix in the first cooperation cell on clear data RE, add the above equivalent data pre-coding matrix, using gained add with result as the first cooperation cell the data precoding matrix on current RE, utilize the data precoding matrix of described the first cooperation cell on current RE to be weighted the data-signal of UE, in the first cooperation cell, send weighted results, or, utilize the data precoding matrix of the first cooperation cell on clear data RE to be weighted and to obtain the first weighted results the data-signal of UE, utilize described equivalent data pre-coding matrix to be weighted and to obtain the second weighted results the data-signal of UE, in the first cooperation cell, send the first weighted results and the second weighted results.
9. for a data processing equipment for cooperative multicast system, it is characterized in that, this device comprises identification module and sending module;
Whether described identification module, for being identified in current RE, exist in cooperative cluster to UE and send the first cooperation cell of data and have the second cooperation cell that does not send data to described UE;
Described sending module, for identifying at current RE at described identification module, in cooperative cluster, there is the first cooperation cell that sends data to UE, and exist while not sending the second cooperation cell of data to described UE, in the first cooperation cell, send the data-signal of described UE and the second cooperation cell equivalent data signal to described UE, wherein, described equivalent data signal is the result that equivalent data pre-coding matrix is multiplied by the data-signal gained of described UE, described equivalent data pre-coding matrix is the data precoding matrix gained of described the second cooperation cell on clear data RE is multiplied by the second cooperation cell product result to the channel matrix gained of described UE divided by the first cooperation cell again to the channel matrix of described UE, described clear data RE is the RE that all cooperation cell all only send data-signal on this RE.
10. device according to claim 9, is characterized in that,
Described sending module, be multiplied by the product result to the channel matrix gained of described UE divided by the first cooperation cell again of the data precoding matrix gained of described the second cooperation cell on clear data RE to the channel matrix of described UE for obtaining the second cooperation cell, using the result of gained as the equivalent data pre-coding matrix of data-signal of being simulated the second cooperation cell by the first cooperation cell and send UE, on the basis of the data precoding matrix in the first cooperation cell on clear data RE, add the above equivalent data pre-coding matrix, using gained add with result as the first cooperation cell the data precoding matrix on current RE, utilize the data precoding matrix of described the first cooperation cell on current RE to be weighted the data-signal of UE, in the first cooperation cell, send weighted results, or, utilize the data precoding matrix of the first cooperation cell on clear data RE to be weighted and to obtain the first weighted results the data-signal of UE, utilize described equivalent data pre-coding matrix to be weighted and to obtain the second weighted results the data-signal of UE, in the first cooperation cell, send the first weighted results and the second weighted results.
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