CN102237952A - Precoding method based on MIMO (multiple-input multiple-output) data transmission - Google Patents

Precoding method based on MIMO (multiple-input multiple-output) data transmission Download PDF

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CN102237952A
CN102237952A CN2010101656753A CN201010165675A CN102237952A CN 102237952 A CN102237952 A CN 102237952A CN 2010101656753 A CN2010101656753 A CN 2010101656753A CN 201010165675 A CN201010165675 A CN 201010165675A CN 102237952 A CN102237952 A CN 102237952A
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coding matrix
link performance
control signaling
needs
correspondence
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李迎阳
韩臸奎
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Abstract

The invention provides a precoding method based on multiple-input multiple-output (MIMO) data transmission. When a hybrid automatic retransmission request (HARQ) operation is triggered by an HARQ-acknowledgement (ACK) channel and only one transmission block (TB) needs repeated transmission, the method is used for determining a sub-precoding matrix used by the TB. The method comprises the following steps: comparing the link performance of every TB transmitted before the HARQ operation; and precoding and transmitting the TB which needs repeated transmission by using the sub-precoding matrix corresponding to the TB with better link performance. The invention can enhance the success probability of TB repeated transmission in the HARQ operation, thereby enhancing the uplink resource utilization ratio.

Description

A kind of method for precoding based on the MIMO transfer of data
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of to based on the method for precoding of going into to have more (MIMO) transfer of data.
Background technology
In strengthening Long Term Evolution (LTE-A) system,, adopt the MIMO technology to send data in order to improve the performance of up link.And with the LTE systems compliant, the physical layer transmission technology of up link is still based on single carrier frequency division multiplexing (SCFDMA).When upstream data being carried out the MIMO transmission, be to adopt the method for precoding that R data flow is mapped on the Nt transmit antennas in LTE-A, pre-coding matrix is the matrix that Nt is capable and R is listed as here.In LTE-A, each data flow is called one deck (layer), and each row of pre-coding matrix are actual like this is that the data of one deck are carried out precoding.In the following description, each row of pre-coding matrix are pressed sequential index from left to right, and difference respective layer index 0,1 ... R-l.Below be respectively the number of plies and be 1,2,3,4 pre-coding matrix example:
1 2 1 1 1 - 1 , 1 2 1 0 1 0 0 1 0 - j , 1 2 1 0 0 1 0 0 0 1 0 0 0 1 , 1 2 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1
To the transmitting uplink data based on MIMO, UE sends two transmission blocks (TB) simultaneously, the corresponding code word (CW) of each TB, and these two CW finally are mapped to R layer and are using pre-coding matrix to carry out sending after the precoding then.According to present discussion result, first CW is before being mapped to
Figure GSA00000092657000015
Individual layer; Second CW is after being mapped to simultaneously
Figure GSA00000092657000016
Individual layer, preceding
Figure GSA00000092657000017
Individual layer as after
Figure GSA00000092657000018
Individual layer is two sub-pre-coding matrixes.
UE finishes by resource allocation control signaling the scheduling of TB when transmit ascending data; The base station sends in the resource allocation control signaling of UE and indicates pre-coding matrix, and UE adopts this pre-coding matrix that TB is carried out precoding and sends.
In LTE when mixing automatic repeat requests (HARQ) transmit ascending data, can control UE with up resource allocation signal and send new data or data retransmission, and can only finish by a new ascending resource assignment signalling the scheduling of new transmission block.Simultaneously, HARQ ACK/NACK information can also be fed back with Physical HARQ Indicator Channel (PHICH) in the base station, if PHICH information is ACK, then indicates the transmitting uplink data success, and does not have new data; If PHICH information is NACK, then indicate upstream data also not have transmission success, indication UE is to retransmitting with a upstream data when not surpassing maximum retransmission.In LTE-A, support MIMO transmission to upstream data, two TB of promptly parallel transmission, according to present conclusion, the base station can be fed back HARQACK/NACK information respectively for each TB on the PHICH channel.To a TB, similar with the situation of LTE, if promptly feedback information is ACK, then indicate this TB transmission success, and do not have new data on this TB, to send; If feedback information is NACK, then indicate this TB also not have transmission success, when not surpassing maximum retransmission, indication UE retransmits this TB.
Here, when HARQ operation is when triggering with PHICH, promptly the base station does not send up-to-date precoding information to UE, the TB that retransmits for needs so, and the precoding information that UE can't obtain to be fit to does not come it is carried out precoding.
Summary of the invention
The invention provides a kind of method for precoding based on the MIMO transfer of data, TB retransmits probability of successful in the time of can improving the HARQ operation, thereby improves the ascending resource utilance.
Technical scheme of the present invention is achieved in that
A kind of method for precoding based on the MIMO transfer of data, being used in HARQ operation is to be triggered by the HARQ-ACK channel, and only need retransmit a TB time, determines the sub-pre-coding matrix that described TB uses, this method comprises:
The link performance of each TB that sends before the more described HARQ operation;
Use link performance preferably the sub-pre-coding matrix of TB correspondence TB that needs are retransmitted carry out precoding and send.
As seen, in the method that the present invention proposes, UE utilizes the sub-pre-coding matrix (matrix that the pairing layer of the TB of link better performances is formed in the pre-coding matrix just) of the TB correspondence of link better performances in the pre-coding matrix that uses before the HARQ operation to retransmit this TB.Adopt method of the present invention, can increase the re-transmission probability of successful of this TB, thereby improve the ascending resource utilance.
Description of drawings
Fig. 1 is the method for precoding flow chart of MIMO transfer of data of the present invention;
Fig. 2 determines to retransmit the method flow diagram of the sub-pre-coding matrix of use for the present invention;
Fig. 3 is the method flow diagram of the embodiment of the invention one based on the sub-pre-coding matrix of MCS decision re-transmission use;
Fig. 4 is the method flow diagram of the embodiment of the invention two based on the sub-pre-coding matrix of TBS decision re-transmission use;
When Fig. 5 was the embodiment of the invention three multiplexing TB that will retransmit and upstream control signaling, decision retransmitted the method flow diagram of the sub-pre-coding matrix that uses based on TBS.
Embodiment
The present invention proposes a kind of method for precoding based on the MIMO transfer of data, being used in the HARQ operation is to be triggered by the HARQ-ACK channel, and in the time of only need retransmitting a TB, determine the sub-pre-coding matrix that described TB uses, as the method for precoding flow chart of Fig. 1 for MIMO transfer of data of the present invention, this method comprises:
Step 101: the link performance of each TB that sends before the more described HARQ operation;
Step 102: use link performance preferably the sub-pre-coding matrix of TB correspondence TB that needs are retransmitted carry out precoding and send.
To the transfer of data based on MIMO, the number of the TB of transmission is N when supposing to support TB, corresponding CW number also is N TB, in the LTE/LTE-A system, N TBEqual 2.Further hypothesis is indicated its modulation coding mode (MCS) to each TB respectively in resource allocation control signaling, like this, MCS can obtain the size (TBS) of this TB in conjunction with the resource quantity (being meant the number of Physical Resource Block PRB in the LTE/LTE-A system) of the physical channel that distributes.Here, the link performance of a plurality of TB of MIMO transmission generally is different, and this MCS or TBS that is reflected in them is different.Below hypothesis supports to send simultaneously maximum two TB in the MIMO transfer of data.Specifically, the number of plies of supposing the mapping of two TB equates that then the value of MCS has directly reflected their link performance, and general MCS value is big more, the i.e. more modulation system of high-order and/or higher code rate (coding rate), then the link performance of Dui Ying TB is good more.Here, equating because suppose the number of plies of the mapping of two TB, is consistent so adopt TBS when judging link performance with the judged result of MCS.The number of plies of mapping of supposing two TB is unequal, can still use relatively two TB link performances of MCS, perhaps can come the link performance of two TB of comparison based on TBS, and in general, the link performance of the big more then TB of correspondence of TBS value is good more.
To this transfer of data based on MIMO, when its HARQ operation is when triggering with the HARQ-ACK channel, be that the base station does not send new resource allocation control signaling, when just not indicating new precoding information, UE has to obtain the current pre-coding matrix that will use according to a resource allocation control signaling of receiving in the past.Suppose one of them TB transmission success (feedback information is ACK) and do not utilize this TB to send new data, and also successfully transmission (feedback information is NACK) and do not reach maximum retransmission of another TB, then need to this not the TB of transmission success retransmit.At this moment, be used for transmitting this not the sub-pre-coding matrix of the TB of transmission success can only obtain according to the precoding information of the resource allocation control signaling of receiving in the past.A resource allocation control signaling of receiving before described can be the nearest resource allocation control signaling that UE receives, or signaling is controlled in the nearest resource allocation of dispatching two TB transmission new datas simultaneously that UE receives, or the nearest resource allocation control signaling of having dispatched new data at least on a TB received of UE, or the nearest identical TB of scheduling that receives of UE sends the resource allocation control signaling of new data.
To this re-transmission that triggers with the HARQ-ACK channel, it is W=[W that the ascending resource of receiving before the note HARQ operation distributes the pre-coding matrix of control signaling indication 0W 1], W represents N tThe pre-coding matrix of row and R row, wherein, W 0Be N tRow and L 0The sub-pre-coding matrix of row, and be used for the CW0 of TB0 correspondence is carried out precoding; W 1Be N tRow and L 1The sub-pre-coding matrix of row, and be used for the CW1 of TB1 correspondence is carried out precoding; N tBe the number of transmitting antenna, L 0And L 1Be respectively the number of plies of CW0 and CW1 mapping, and R=L 0+ L 1To this re-transmission that triggers with the HARQ-ACK channel, first method is that the sub-pre-coding matrix of reusing the CW corresponding with the TB that needs to retransmit carries out precoding and transmission, i.e. re-transmission to TB k is to use sub-pre-coding matrix W k, k equals 0 or 1; Modulation system to this TB during such re-transmission also remains unchanged, and promptly reuses the modulation system of the CW corresponding with the TB that needs re-transmission.Second method is to use the sub-pre-coding matrix of the CW of the current TB correspondence that stops to carry out precoding and transmission when retransmitting, i.e. re-transmission to TB k is to use sub-pre-coding matrix W 1-kTo the modulation system of this TB, can remain unchanged during such re-transmission, promptly continue to use the modulation system of the CW corresponding with this TB that need retransmit; Also can use the modulation system of the CW corresponding with the current TB that stops.
Be the third method as shown in Figure 2, Fig. 2 determines to retransmit the method flow diagram of the sub-pre-coding matrix of use for the present invention.To transmit these 2 TB of TB0, TB1 before the HARQ operation, TB0, TB1 be corresponding CW0 and CW1 respectively in Fig. 2, and need retransmit one of them TB during the HARQ operation is that example describes.This method comprises:
Step 201: the link performance of at first judging which CW is better, can judge based on MCS or TBS here, thereby use the sub-pre-coding matrix of the reasonable CW correspondence of link performance to carry out precoding and transmission when retransmitting TB; Specifically, when the link performance of CW0 is better, execution in step 202; When the link performance of CW1 is better, execution in step 203.
Step 202: the TB that uses the sub-pre-coding matrix corresponding with CW0 that needs are retransmitted carries out precoding and sends, and finishes current flow process.
Step 203: the TB that uses the sub-pre-coding matrix corresponding with CW1 that needs are retransmitted carries out precoding and sends, and finishes current flow process.
To the modulation system of this TB, can remain unchanged during such re-transmission, promptly continue to use the modulation system of the CW corresponding with this TB that need retransmit; Also can use the modulation system of the reasonable CW of link performance; Specifically, if the link performance of CW0 is better, then reuse the modulation system of CW0; If the link performance of CW1 is better, then use the modulation system of CW1.
When the link performance of two CW is the same, the MCS that is them is identical, perhaps TBS equates, at this moment when retransmitting this TB, perhaps fixing sub-pre-coding matrix and the modulation system of using the CW0 correspondence, perhaps fix sub-pre-coding matrix and the modulation system of using the CW1 correspondence, perhaps reuse the sub-pre-coding matrix and the modulation system of this TB correspondence that need retransmit, perhaps use the sub-pre-coding matrix and the modulation system of the current TB correspondence that stops.
The another kind of expression form of the described method of Fig. 2 is: the link performance of CW of at first judging which TB correspondence is good, here can judge that the link performance of CW of which TB correspondence is good based on MCS or TBS, thereby when retransmitting, use the sub-pre-coding matrix of the CW of the reasonable TB correspondence of link performance to carry out precoding and send; Specifically, if the link performance of the CW of this TB correspondence that need retransmit is relatively good, then reuse the sub-pre-coding matrix of the CW corresponding with this TB that need retransmit; If the link performance of the CW of the current TB correspondence that stops is relatively good, then use the sub-pre-coding matrix of the CW of this current TB of stopping correspondence.To the modulation system of this TB, can remain unchanged during such re-transmission, promptly continue to use the modulation system of the CW corresponding with this TB that need retransmit; Also can use the modulation system of the CW of the reasonable TB correspondence of link performance, specifically,, then reuse the modulation system of the CW corresponding with this TB if the link performance of the CW of the TB correspondence of this re-transmission is relatively good; If the link performance of the CW of the current TB correspondence that stops is relatively good, then use and this current modulation system that stops the corresponding CW of TB.
When the link performance of two TB is the same, the MCS that is them is identical, perhaps TBS equates, the sub-pre-coding matrix and the MCS that at this moment can reuse this TB correspondence that need retransmit carry out precoding and modulation to this TB that need retransmit, and also can use the sub-pre-coding matrix of the current TB correspondence that stops and MCS that this TB that need retransmit is carried out precoding and modulation.
It is emphasized that corresponding CW owing to a TB, therefore, the link performance of above-mentioned TB is equal to the link performance of the CW of TB correspondence.
In the LTE system, the design principle of its descending MIMO transfer of data is only to send a TB and be when this TB is retransmitted, having only this TB once to be mapped under the situation about transmitting on two layers, just supporting to come this TB is retransmitted with two layers.If this restriction is applied to method of the present invention, it then is 3 situation to the number of plies of pre-coding matrix, if the number of plies of the sub-pre-coding matrix of the CW of the TB correspondence that retransmits is 1, then when retransmitting this TB, can only reuse sub-pre-coding matrix and the MCS of the CW corresponding with this TB; If the number of plies of the sub-pre-coding matrix of the CW of the TB correspondence that retransmits is 2, then when retransmitting this TB, the sub-pre-coding matrix and the MCS that use in the time of can adopting method of the present invention to select to retransmit this TB.
Below lifting specific embodiment introduces in detail:
Embodiment one:
In the present embodiment, UE has disposed four transmit antennas, thereby can support maximum 4 layers MIMO transfer of data.The parallel data that send two TB of base station scheduling UE, base station receive after the upstream data and decoding of UE, trigger the HARQ operation of UE to upstream data with PHICH.In addition, two TB that UE sent before the HARQ operation are designated as TB0, TB1 respectively, and its corresponding CW is designated as CW0, CW1 respectively.The processing method of UE is below described.
As Fig. 3 is the method flow diagram of the embodiment of the invention one based on the sub-pre-coding matrix of MCS decision re-transmission use.Comprise:
Step 301:UE receives the PHICH channel information, judges the state of two TB according to the PHICH channel information.If the feedback information of two TB all is ACK, then represent these two TB not need to retransmit; If the feedback information of two TB all is NACK, then represent these two TB all to need to retransmit, continue execution in step 302; If the feedback information of a TB is ACK, represent this TB not need to retransmit, and the feedback information of another TB is NACK, represents this TB to need to retransmit, and continues execution in step 303.
The pre-coding matrix that step 302:UE uses the resource allocation of two TB of the last scheduling to control in the signaling retransmits this two TB, finishes current flow process.
Step 303:UE selects to use the sub-pre-coding matrix and the corresponding M CS thereof of certain TB correspondence according to the height of the MCS of two TB in the resource allocation control signaling of two TB of the last time scheduling, the MCS of or TB0 identical as the MCS of two TB when higher, execution in step 304; When the MCS of TB1 when higher, execution in step 305.
Step 304: use the MCS corresponding that the TB that this need retransmit is modulated, and use the sub-pre-coding matrix of TB0 correspondence that this TB that need retransmit is carried out precoding and transmission, finish current flow process with TB0.
Step 305: use the MCS corresponding that the TB that this need retransmit is modulated, and use the sub-pre-coding matrix of TB1 correspondence that this TB that need retransmit is carried out precoding and transmission, finish current flow process with TB1.
Embodiment two:
Suppose that UE has disposed four transmit antennas, thereby can support maximum 4 layers MIMO transfer of data.The parallel data that send two TB of base station scheduling UE, base station receive after the upstream data and decoding of UE, trigger the HARQ operation of UE to upstream data with PHICH.In addition, two TB that UE sent before the HARQ operation are designated as TB0, TB1 respectively, and its corresponding CW is designated as CW0, CW1 respectively.The processing method of UE is below described.
As Fig. 4 is the method flow diagram of the embodiment of the invention two based on the sub-pre-coding matrix of TBS decision re-transmission use.Comprise:
Step 401:UE receives the PHICH channel information, judges the state of two TB according to the PHICH channel information.If the feedback information of two TB all is ACK, then represent these two TB not need to retransmit; If the feedback information of two TB all is NACK, then represent these two TB all to need to retransmit, continue execution in step 402; If the feedback information of a TB is ACK, represent this TB not need to retransmit, and the feedback information of another TB is NACK, represents this TB to need to retransmit, and continues execution in step 403.
The pre-coding matrix that step 402:UE uses the resource allocation of two TB of the last scheduling to control in the signaling retransmits this two TB, finishes current flow process.
Step 403:UE selects to use the sub-pre-coding matrix and the corresponding M CS thereof of certain TB correspondence according to the TBS of two TB in the resource allocation control signaling of two TB of the last time scheduling, if the TBS of two TB is identical or the TBS of the TB of current re-transmission when bigger, execution in step 404; When if the TBS of the current TB that stops is bigger, execution in step 405.
Step 404: use the MCS of the TB of current re-transmission that the TB that this need retransmit is modulated, and use the sub-pre-coding matrix of the TB correspondence of current re-transmission that this TB that need retransmit is carried out precoding and transmission, finish current flow process.
Step 405: use the MCS of the current TB that stops that the TB that this need retransmit is modulated, and use the sub-pre-coding matrix of the current TB correspondence that stops that this TB that need retransmit is carried out precoding and transmission, finish current flow process.
Embodiment three
Suppose that UE has disposed four transmit antennas, thereby can support maximum 4 layers MIMO transfer of data.The parallel data that send two TB of base station scheduling UE, base station receive after the upstream data and decoding of UE, trigger the HARQ operation of UE to upstream data with PHICH.Here suppose further that UE also needs to send upstream control signaling on the timing position of the uplink HARQ operation that PHICH triggers.In addition, two TB that UE sent before the HARQ operation are designated as TB0, TB1 respectively, and its corresponding CW is designated as CW0, CW1 respectively.The processing method of UE is below described.
When being the embodiment of the invention three multiplexing TB that will retransmit and upstream control signaling as Fig. 5, decision retransmits the method flow diagram of the sub-pre-coding matrix that uses based on TBS.Comprise:
Step 501:UE receives the PHICH channel information, judges the state of two TB according to the PHICH channel information.
If the feedback information of two TB all is ACK, then represent these two TB not need to retransmit; Continue execution in step 502;
If the feedback information of two TB all is NACK, then represent these two TB all to need to retransmit, continue execution in step 503;
If the feedback information of a TB is ACK, represent this TB not need to retransmit, and the feedback information of another TB is NACK, at this moment UE only need retransmit a TB at up direction, and the promptly current TB that does not have transmission success continues execution in step 504.
The capable physically control channel (PUCCH) of step 502:UE is gone up and is sent upstream control signaling, finishes current flow process.
Step 503:UE carries out multiplexing to the upstream data of two TB and upstream control signaling, use pre-coding matrix in the upstream control signaling of two TB of the last scheduling to come the data after multiplexing are carried out precoding and sent then, finishes current flow process.
Step 504:UE selects to use the sub-pre-coding matrix and the corresponding M CS thereof of certain TB correspondence according to the TBS of each TB in the upstream control signaling of two TB of the last time scheduling, if the TBS of two TB is identical or the TBS of the TB of current re-transmission when bigger, execution in step 505; When if the TBS of the current TB that stops is bigger, execution in step 506.
Step 505: TB and upstream control signaling that needs are retransmitted carry out multiplexing, use the MCS of the TB of current re-transmission that the TB after multiplexing is modulated, and use the sub-pre-coding matrix of the TB correspondence of current re-transmission that the TB after multiplexing is carried out precoding and transmission, finish current flow process.
Step 506: TB that needs are retransmitted and upstream control signaling carry out multiplexing, use the MCS of the current TB correspondence that stops that the TB after multiplexing is modulated, and use the sub-pre-coding matrix of the current TB correspondence that stops that the TB after multiplexing is carried out precoding and transmission.
As seen, adopt method of the present invention, the CW good with link performance retransmits TB, thereby increases the re-transmission probability of successful of this TB; Simultaneously, on the good CW of link performance, send upstream control signaling, the expense of the resource that the reduction upstream control signaling takies and raising uplink control signaling transmission reliable rows.The present invention does not limit upstream data and the concrete multiplexing method of uplink control signaling.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (13)

1. method for precoding based on multiple-input, multiple-output MIMO transfer of data, being used for mixing automatic repeat requests HARQ operation is to confirm that by HARQ-ack channel triggers, and in the time of only need retransmitting a transmission block TB, determine the sub-pre-coding matrix that described TB uses, it is characterized in that described method comprises:
The link performance of each TB that sends before the more described HARQ operation;
Use link performance preferably the sub-pre-coding matrix of TB correspondence TB that needs are retransmitted carry out precoding and send.
2. method according to claim 1 is characterized in that, the mode of the link performance of each TB that sends before the described relatively HARQ operation is:
Modulation coding mode MCS based on described each TB compares.
3. method according to claim 1 is characterized in that, the mode of the link performance of each TB that sends before the described relatively HARQ operation is:
TB size TBS based on described each TB compares.
4. method according to claim 1 is characterized in that, uses the described modulation system of the TB of re-transmission that needs that the described TB that retransmits that needs is modulated.
5. method according to claim 1 is characterized in that, use described link performance preferably the modulation system of TB the described TB that need to retransmit is modulated.
6. method according to claim 1 is characterized in that, when the link performance of each TB that sends before the described HARQ operation was identical, the described use link performance pre-coding matrix of TB correspondence TB that needs are retransmitted preferably carried out precoding and is:
Use the sub-pre-coding matrix of the described TB correspondence that need to retransmit that the described TB that retransmits that needs is carried out precoding, using describedly needs the modulation system of the TB that retransmits and the described TB of re-transmission that needs is modulated.
7. method according to claim 1 is characterized in that, when the link performance of each TB that sends before the described HARQ operation was identical, the described use link performance pre-coding matrix of TB correspondence TB that needs are retransmitted preferably carried out precoding and is:
Use the sub-pre-coding matrix of the current TB correspondence that stops to transmit that the described TB that retransmits that needs is carried out precoding, use the modulation system of the current TB that stops to transmit that the described TB that retransmits that needs is modulated.
8. method according to claim 1 is characterized in that, the described link performance pre-coding matrix of TB correspondence preferably is contained in pre-coding matrix, and described pre-coding matrix is by the resource allocation control signaling indication of receiving before the described HARQ operation.
9. method according to claim 8 is characterized in that, the resource allocation control signaling of receiving before the described HARQ operation is: the nearest resource allocation control signaling that UE receives.
10. method according to claim 8 is characterized in that, the resource allocation control signaling of receiving before the described HARQ operation is: the nearest resource allocation control signaling of dispatching two TB transmission new datas simultaneously that UE receives.
11. method according to claim 8 is characterized in that, the resource allocation control signaling of receiving before the described HARQ operation is: the nearest resource allocation control signaling of having dispatched new data at least on a TB that UE receives.
12. method according to claim 8 is characterized in that, the resource allocation control signaling of receiving before the described HARQ operation is: the nearest identical TB of scheduling that UE receives sends the resource allocation control signaling of new data.
13. method according to claim 1 is characterized in that, when further when need sending upstream control signaling, the described use link performance pre-coding matrix of TB correspondence TB that needs are retransmitted preferably carries out precoding and comprises:
Carry out multiplexing to described TB and the upstream control signaling that needs to retransmit, use link performance preferably the sub-pre-coding matrix of TB correspondence described TB after multiplexing is carried out precoding, use link performance preferably the modulation system of TB described TB after multiplexing is modulated.
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Application publication date: 20111109