CN102237987B - Method and device for processing HARQ (Hybrid Automatic Repeat Request) in spatial multiplexing mode - Google Patents

Abstract

The invention provides a method and device for processing an HARQ (Hybrid Automatic Repeat Request) in a spatial multiplexing mode. The method comprises the following steps of: storing layer number and modulation and coding scheme (MCS) parameters used by new transmission of a transport block (TB) for HARQ transmission of user equipment (UE) as well as the retransmission times of each TB, and receiving and storing rank indication and channel quality indication information latterly reported by the UE by a base station; performing rank self-adaptive processing by the base station to obtain a layer used at a current transmission time interval (TTI) of the UE; and determining the TB of the HARQ waiting to be retransmitted at the current TTI of the UE and the MCS used by each TB according to the layer number and the MCS parameters used by new transmission of the TB transmitted by the HARQ of the UE, the retransmission times of each TB, the rank indication and channel quality indication information latterly reported by the UE and the layer used at the current TTI of the UE, obtained by rank self-adaptive processing. According to the method and the device, the retransmission time delay of the TB can be shortened.

Description

HARQ retransmission processing method and device under space multiplexing mode

Technical field

The present invention relates to the communications field, be specifically related to HARQ retransmission processing method and device under a kind of space multiplexing mode.

Background technology

MIMO (Multi-input Multi-output, multiple-input and multiple-output) is used a plurality of (N _t) transmitting antenna and a plurality of (N _r) Radio Transmission Technology of reception antenna, it can improve the capacity of wireless network and link transmission performance etc. effectively.By N _ttransmitting and N _rthe mimo channel that reception antenna forms (is used matrix represent) can be decomposed into N _sindividual independent channel, in LTE (Long Term Evolution, Long Term Evolution) system, is called Rank (order) in UE (User Equipment, subscriber equipment) side, at network side, is called Layer (layer), and N _s≤ min{N _t, N _r.

The approach that realizes of MIMO technology mainly contains two kinds: space diversity and spatial reuse.In LTE system, for spatial multiplexing mode, UE need to feed back the Rank of mimo channel to network side, and the Rank that network side reports according to UE carries out the transmitting of Rank self adaptation.Spatial reuse comprises two kinds of transmission modes: postpone greatly CDD (Cyclic Delay Diversity, cyclic delay diversity) transmission mode and Closed-Loop Spatial Multiplexing pattern.

In LTE system, can transmit many bag data when mixed self-adapting repeat requests (HARQ, Hybrid Automatic RepeatRequest) technology is carried out transfer of data in mimo channel, each wraps data and adopts respectively independently layer simultaneously.For descending HARQ, adopt asynchronous adaptive mode to transmit.Each data flow is carried out respectively to HARQ transmission.The data of transmission can be new biographies simultaneously, can be also to retransmit, and can also be that both all have.

Prior art is carried out self adaptation adjustment from the changing condition of order to order, does not consider the factor that HARQ retransmits.When HARQ carries out transfer of data, TB (Transport Block, the transmission block) piece need retransmitting is uncertain, and TB piece can be subject to the restriction of order while transmitting.Following situation for example: the number of plies of adjusting current TTI (Transmission Time Interval, Transmission Time Interval) when rank adaptation is 1 while transmitting, and the HARQ of current TTI need to retransmit 2 TB pieces.

Patent < < space multiplexing mode mixed automatic retransfer request processing method and device > > (application number is CN200910171244.5) propose the treatment technology of HARQ under the space multiplexing mode based on number of retransmissions and rank adaptation, above situation is handled as follows: the number of plies of adjusting current TTI when rank adaptation is 1 to transmit, and when the HARQ of current TTI need to retransmit 2 TB pieces, retransmit 1 TB piece.This processing may cause following two problems: problem 1: as the SINR of retransmitted TB piece needs (Signal to Interference plus Noise Ratio, while Signal to Interference plus Noise Ratio) being less than the SINR of current TTI, probably this TB piece retransmits or is unsuccessful; Problem 2: the time delay of the TB piece not retransmitting increases, does not likely make full use of the capacity of mimo channel simultaneously.

Summary of the invention

Technical problem to be solved by this invention is to provide processing method and the device that the HARQ under a kind of space multiplexing mode retransmits, and reduces the retransmission delay time of TB piece, improves the utilance of mimo channel capacity simultaneously.

In order to solve the problems of the technologies described above, the invention provides HARQ retransmission processing method under a kind of space multiplexing mode, described method comprises:

The mixed self-adapting of base station stored subscriber equipment (UE) retransmits the number of times that the number of plies that the new biography of the transmission block (TB) of (HARQ) transmission uses and modulation coding mode (MCS) parameter, each TB piece retransmit, and receives and order indication and channel quality indication (CQI) information that storage UE the last time reports;

Rank adaptation processing is carried out in base station, obtains the layer that UE current transmission time interval (TTI) is used;

The MCS that layer, the TB piece of determining UE current TTI HARQ to be retransmitted and each TB piece that the UE current TTI that the number of times of the number of plies that base station is used according to the new biography of the TB piece of the HARQ transmission of described UE and MCS parameter, each TB piece re-transmission, the order indication that described UE the last time reports and channel quality indication (CQI) information and the processing of described rank adaptation obtain is used used.

In order to solve the problems of the technologies described above, the present invention also provides HARQ retransmission process device under a kind of space multiplexing mode, and described device comprises:

Information and memory module, the number of times information retransmitting for storing the number of plies that the new biography of TB piece of the HARQ transmission of UE uses and MCS parameter, each TB piece; Receive and store order indication and channel quality indication (CQI) information that UE the last time reports; Described canned data is sent to HARQ retransmission process module;

Rank adaptation processing module, the layer using for obtaining UE current transmission time interval (TTI), and send to HARQ retransmission process module;

HARQ retransmission process module, for receiving the number of plies and MCS parameter, the number of times information that each TB piece retransmits, the order that UE the last time reports that the new biography of TB of the HARQ transmission of the UE that information and memory module send uses, indicate and channel quality indication (CQI) information, the layer that the UE that reception rank adaptation processing module is sent is used in current TTI, process, and the MCS of the TB piece of definite UE current TTI HARQ to be retransmitted and the use of each TB piece.

The RI that the present invention reports by UE (Rank Indicator, order is indicated) and CQI (ChannelQuality Indicator, channel quality indication) carry out the processing that under space multiplexing mode, HARQ retransmits, can reduce the retransmission delay time of TB piece, improve the utilance of mimo channel capacity simultaneously.

Accompanying drawing explanation

Fig. 1 is the flow chart of HARQ retransmission processing method under space multiplexing mode of the present invention.

Fig. 2 is HARQ retransmission process apparatus structure composition frame chart under space multiplexing mode of the present invention.

Embodiment

Main thought of the present invention is: the RI reporting by UE (Rank Indicator, order is indicated) and CQI (Channel Quality Indicator, channel quality indication) carry out the processing that under space multiplexing mode, HARQ retransmits, to reduce the retransmission delay time of TB piece, improve the utilance of mimo channel capacity simultaneously.

Below in conjunction with the drawings and specific embodiments, technical solution of the present invention is further described.

Shown in Fig. 1, the HARQ retransmission processing method under space multiplexing mode of the present invention comprises the steps:

The number of plies and MCS (Modulation and Coding Scheme that the new biography of the TB piece of the HARQ transmission of step S1: base station stored UE is used, modulation coding mode), the number of times that each TB piece retransmits, and receive and store order indication and the channel quality indication (CQI) information that UE the last time reports;

The last time reports and comprises current TTI, in other words, uses the order that UE the last time reports to indicate and channel quality indication (CQI) information in current TTI.

Step S2: the layer that rank adaptation calculates current TTI is carried out in base station;

Step S3: the layer that the number of times of the number of plies that base station is used according to the new biography of the TB piece of the HARQ transmission of described UE and MCS, each TB piece re-transmission, the order indication that described UE the last time reports and channel quality indication (CQI) information and described rank adaptation calculating UE current TTI are used is determined the TB piece of UE current TTI HARQ to be retransmitted, the MCS that each TB piece is used.

The flow process of HARQ retransmission processing method under space multiplexing mode of the present invention shown in Fig. 1 is further launched to explanation below.Under space multiplexing mode of the present invention, HARQ retransmission processing method comprises the steps:

The number of plies and MCS that each new biography TB piece under the HARQ of step 1: base station stored UE is used, the number of times that each TB piece retransmits, receives and stores order indication RI and channel quality indicator CQI information that UE the last time reports.

The TB piece number that makes UE treat that in current TTI HARQ retransmits is TBNumwait, and each TB piece uses respectively TBwait (i) to represent, wherein, and i ∈ { 0 .., TBNumwait-1}; The number of plies that each TB piece new biography is used uses respectively Ltb (i) to represent, the number of plies that each TB piece is used is altogether wherein, i ∈ 0 ..., TBNumwait-1}; The MCS that each TB piece is used uses respectively MCStb (i) to represent, wherein, i ∈ 0 ..., TBNumwait-1}; Each TB piece number of retransmissions uses respectively RetransNumtb (i) to represent, wherein, i ∈ 0 ..., TBNumwait-1}.The order that UE reports is recently indicated and is represented with RIreport, and every layer represents with Lr (l), wherein, l ∈ 1 ..., RIreport}.The upper code word that can transmit of RIreport (or TB piece) number represents with Ncwreport, CW for code word (p) expression, wherein, p ∈ 0 ..., Ncwreport-1}.CQIreport for CQI (p) expression that UE the last time reports, wherein, p ∈ { 0 .., Ncwreport-1}.The last time reports and comprises current TTI.

For LTE system, by the number of plies, just can know its corresponding codeword information, for the mimo channel of 2 transmitting antenna 2 reception antennas, the number of plies and code word mapping relations are as shown in table 1, for the mimo channel of 4 transmitting antenna 4 reception antennas, the number of plies and code word mapping relations are as shown in table 2.

Step 2: rank adaptation processing is carried out in base station, obtains the layer that UE current TTI is used, and with Ladaptive (comprising the number of plies and position thereof), represents.Every layer represents with La (m), wherein, m ∈ 0 ..., Ladaptive-1}.

For LTE system, by the number of plies, just can know its corresponding positional information, for the mimo channel of 2 transmitting antenna 2 reception antennas, the number of plies is as shown in table 1 with the position mapping relations of layer, for the mimo channel of 4 transmitting antenna 4 reception antennas, the number of plies is as shown in table 2 with the position mapping relations of layer.

Step 3: the order indication that the layer that the number of plies that base station is used according to each new biography TB piece under the HARQ of UE and MCS, rank adaptation calculating UE current TTI are used and UE the last time report and channel quality are indicated and determined the TB piece of UE current TTI HARQ to be retransmitted and the MCS that each TB piece is used.Be handled as follows:

Step 3.1: total number of plies Lneed that relatively new biography of the TB piece of the HARQ of UE transmission is used and rank adaptation calculate the layer Ladaptive that UE current TTI is used, according to comparative result, obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, specifically comprise:

When Lneed equals Ladaptive, enter step 3.2; When Lneed is less than Ladaptive, enter step 3.3; When Lneed is greater than Ladaptive, enter step 3.4;

Step 3.2: obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1}.Prior art has solved this problem; Enter step 3.5;

Step 3.3: when Lneed is less than Ladaptive, according to the order that UE the last time reports, indicate RIreport and channel quality indicator (CQI) report (p) and weighted factor β to calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSa (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}.The span of weighted factor β be β ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is larger, β is also larger.

Adopt following steps:

By the CQI shown in CQIreport (p) and table 3 and spectrum efficiency mapping relations, draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (l) expression on every layer, wherein, l ∈ { 1, ..., RIreport};

Obtain the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed, adopt formula (1.1) to calculate:

$\mathrm{SpecEffneed}\left(n\right)=\frac{{\mathrm{\&beta;}}^{*}\underset{l=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---\left(1.1\right)$

Wherein, n ∈ { 0 .., Lneed-1}.

Calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1}, adopts with the following method:

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word; For LTE system, by the layer in UE current TTI needed layer Lneed and table 1 or definite each code word of table 2, and the mean value of the corresponding spectrum efficiency of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use;

The MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits; Enter step 3.5.

Step 3.4: when Lneed is greater than Ladaptive, according to the order that UE the last time reports, indicate RIreport and channel quality indicator (CQI) report (p) and weighted factor γ to calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSa (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}; The span of weighted factor γ be γ ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is less, γ is also less;

Employing following steps are calculated:

By the CQI shown in CQIreport (p) and table 3 and spectrum efficiency mapping relations, draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, the SpecEffr for spectrum efficiency (l) on every layer represents, wherein, l ∈ { 1, ..., RIreport}

Obtain the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed, adopt formula (1.2) to calculate:

$\mathrm{SpecEffneed}\left(n\right)=\frac{{\mathrm{\&gamma;}}^{*}\underset{l=o}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---\left(1.2\right)$

Wherein, n ∈ 0 ..., Lneed-1},

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1}, adopts with the following method:

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, for LTE system, by the layer in UE current TTI needed layer Lneed and table 1 or definite each code word of table 2, and the mean value of the corresponding spectrum efficiency of layer comprising in code word is designated as to the spectrum efficiency in this code word

The spectrum efficiency of the code word of using according to UE current TTI and and table 4 shown in spectrum efficiency and the mapping relations of the MCS MCSneed (k) that determines the code word of current use, the MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits; Enter step 3.5.

Step 3.5: the MCStb (i) using according to each new biography TB piece under the HARQ of UE is handled as follows with the relation of the MCSneed (k) that the corresponding TB piece of UE current TTI needed layer Lneed adopts:

When re-transmitting data block is counted TBNumwait=1, judge whether MCStb (i) and MCSneed (k) meet formula (1.3),

MCSneed(0)≥MCStb(0) (1.3)

When meeting formula (1.3), retransmit this TB piece, and the MCS adopting is MCStb (0), the code word that this TB piece transmission adopts is code word 0;

When not meeting formula (1.3), this TTI does not retransmit the TB piece under this HARQ.

When re-transmitting data block is counted TBNumwait=2, judge whether MCStb (i) and MCSneed (k) meet formula (1.4) or formula (1.5),

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\end{array}\right.---\left(1.4\right)$

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\end{array}\right.---\left(1.5\right)$

If meet formula (1.4), retransmit these 2 TB pieces (TBwait (0) and TBwait (1)), wherein, the MCS that TBwait (0) adopts is MCStb (0), the code word of employing is code word 0; The MCS that TBwait (1) adopts is MCStb (1), and the code word of employing is code word 1;

If meet formula (1.5), retransmit these two TB pieces (TBwait (0) and TBwait (1)), wherein, the MCS that TBwait (0) adopts is MCStb (0), the code word of employing is code word 1; The MCS that TBwait (1) adopts is MCStb (1), and the code word of employing is code word 0.

If all do not meet, further judge whether to meet formula (1.6):

MCSneed(k)≥MCStb(i) (1.6)

Wherein, i, k ∈ 0 ..., TBNumwait-1}, and i ≠ k.

When meeting formula (1.6), retransmit Tbwait (k), the MCS of employing is MCStb (k), the code word of employing is code word 0;

When not meeting formula (1.6), further judge whether to meet formula (1.7):

$\mathrm{MCStb}\left(i\right)\&le;{\mathrm{\&alpha;}}^{*}\underset{k=0}{\overset{\mathrm{TBNumwait}-1}{\mathrm{\&Sigma;}}}\mathrm{MCSneed}\left(k\right)---\left(1.7\right)$

Wherein, α is weighted factor, value be α ∈ (0,1] (be greater than 0 and be less than or equal to 1 value), i ∈ 0 ..., TBNumwait-1};

When 2 MCStb (0) and MCStb (1) all meet formula (1.7), getting the large TB piece of number of retransmissions in these 2 TB pieces retransmits, and retransmitting the MCS using is the MCS of the TB piece new biography use that described number of retransmissions is large, and the code word of employing is code word 0; In these 2 TB pieces, number of retransmissions is the same, and get the corresponding TB piece of that MCS less in MCStb (0) and MCStb (1) and retransmit, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission, the code word of employing is code word 0; Otherwise an optional TB piece retransmits, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission, the code word of employing is code word 0.

Table 1

Table 2

Table 3

CQI	Spectrum efficiency
		0	Go beyond the scope
1	0.1523
		2	0.2344
3	0.3770
		4	0.6016
5	0.8770
		6	1.1758
7	1.4766
		8	1.9141
9	2.4063
		10	2.7305
11	3.3223
		12	3.9023
13	4.5234
		14	5.1152
15	5.5547

Table 4

Shown in Fig. 2, the HARQ retransmission process apparatus structure composition frame chart under space multiplexing mode of the present invention, the inventive system comprises: information and memory module 20, rank adaptation processing module 21, HARQ retransmission process module 22.Wherein,

Information and memory module 20, the number of times information retransmitting for storing the number of plies that the new biography of TB piece of the HARQ transmission of UE uses and MCS parameter, each TB piece; Receive and store RI and CQI information that UE the last time reports, described canned data is sent to HARQ retransmission process module;

Rank adaptation processing module 21, the layer using for obtaining UE current transmission time interval (TTI), and send to HARQ retransmission process module;

HARQ retransmission process module 22, for receiving the number of plies that the new biography of TB of the HARQ transmission of the UE that information and memory module 20 send uses and MCS parameter, the number of times information of each TB piece re-transmission, RI and the CQI information that UE the last time reports, the layer that the UE that reception rank adaptation processing module 21 is sent is used in current TTI, process, and the MCS of the TB piece of definite UE current TTI HARQ to be retransmitted and the use of each TB piece.

In a preferred embodiment of the invention, described information and memory module 20, reception UE the last time reports and comprises current TTI.

In a preferred embodiment of the invention, described HARQ retransmission process module 22, be further used for total number of plies Lneed and rank adaptation that the new biography of TB piece of the HARQ transmission of comparison UE uses and calculate the layer Ladaptive that UE current TTI is used, and process according to comparative result.

In a preferred embodiment of the invention, described HARQ retransmission process module 22, be further used for equaling Ladaptive as Lneed, obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}.

In a preferred embodiment of the invention, described HARQ retransmission process module 22, is further used for:

When Lneed is less than Ladaptive, the order indication RIreport reporting recently according to UE and channel quality indicator (CQI) report (p) and weighted factor β calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSa (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}; The span of weighted factor β be β ∈ (0,1], described weighted factor β is relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is larger, β is also larger;

By CQIreport (p) and CQI and spectrum efficiency mapping relations, draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (l) expression on every layer, wherein, l ∈ { 1, ..., RIreport};

Calculate the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed,

Order $\mathrm{SpecEffneed}\left(n\right)=\frac{{\mathrm{\&beta;}}^{*}\underset{l=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---\left(1.1\right)$

Wherein, n ∈ { 0 .., Lneed-1};

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1},

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, and the corresponding spectrum efficiency mean value of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use, the MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits.

In a preferred embodiment of the invention, described HARQ retransmission process module 22, is further used for:

When Lneed is greater than Ladaptive:

The order indication RIreport reporting recently according to UE and channel quality indicator (CQI) report (p) and weighted factor γ calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSa (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}; The span of described weighted factor γ be γ ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is less, γ is also less.

By CQIreport (p) and CQI and spectrum efficiency mapping relations, draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (l) expression on every layer, wherein, l ∈ { 1, ..., RIreport};

Obtain the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed,

Order $\mathrm{SpecEffneed}\left(n\right)=\frac{{\mathrm{\&gamma;}}^{*}\underset{l=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---\left(1.2\right)$

Wherein, n ∈ 0 ..., Lneed-1};

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1},

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, and the mean value of the corresponding spectrum efficiency of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use;

The MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits.

In a preferred embodiment of the invention, described HARQ retransmission process module 22, is further used for:

The MCStb (i) using according to each new biography TB piece under the HARQ of UE is handled as follows with the relation of the MCSneed (k) that the corresponding TB piece of UE current TTI needed layer Lneed adopts:

When re-transmitting data block is counted TBNumwait=1, judge whether MCStb (i) and MCSneed (k) meet:

MCSneed(0)≥MCStb(0) (1.3)

If met, retransmit this TB piece, and the MCS adopting is MCStb (0), the code word that this TB piece transmission adopts is code word 0;

If do not met, this TTI does not retransmit this HARQ.

In a preferred embodiment of the invention, described HARQ retransmission process module 22, is further used for:

When re-transmitting data block is counted TBNumwait=2, judge whether MCStb (i) and MCSneed (k) meet:

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\end{array}\right.---\left(1.4\right)$

Or whether meet:

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\end{array}\right.---\left(1.5\right)$

If meet formula (1.4), retransmit 2 and treat re-transmitting data block TBwait (0) and TBwait (1), wherein, the MCS that TBwait (0) adopts is MCStb (0), the code word of employing is code word 0; The MCS that TBwait (1) adopts is MCStb (1), and the code word of employing is code word 1;

If meet formula (1.5), retransmit 2 and treat re-transmitting data block TBwait (0) and TBwait (1), wherein, the MCS that TBwait (0) adopts is MCStb (0), the code word of employing is code word 1; The MCS that TBwait (1) adopts is MCStb (1), and the code word of employing is code word 0;

If all do not meet, further judge whether to meet:

MCSneed(k)≥MCStb(i) (1.6)

Wherein, i, k ∈ 0 ..., TBNumwait-1}, and i ≠ k.

If met, retransmit Tbwait (i), the MCS of employing is MCStb (i), the code word of employing is code word 0;

If do not meet, further judge whether to meet:

$\mathrm{MCStb}\left(i\right)\&le;{\mathrm{\&alpha;}}^{*}\underset{k=0}{\overset{\mathrm{TBNumwait}-1}{\mathrm{\&Sigma;}}}\mathrm{MCSneed}\left(k\right)---\left(1.7\right)$

Wherein, α is weighted factor, value be α ∈ (0,1] (be greater than 0 and be less than or equal to 1 value),

i，k∈{0，...，TBNumwait-1}；

If two MCStb (0) and MCStb (1) all meet formula (1.7), getting that TB piece that in these 2 TB pieces, number of retransmissions is large retransmits, and retransmitting the MCS using is the MCS of the TB piece new biography use that described number of retransmissions is large, and the code word of employing is code word 0; If number of retransmissions is the same in these 2 TB pieces, get the corresponding TB piece of that MCS less in MCStb (0) and MCStb (1) and retransmit, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission, the code word of employing is code word 0; Otherwise an optional TB piece retransmits, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission, the code word of employing is code word 0.

Below by the example in concrete application, technical solution of the present invention is carried out to exemplary illustration.

Application example 1:

Under the mimo channel of 2 transmitting antennas and 2 reception antennas, UE is adopted to closed-loop MIMO transmission mode.

Step 1: the HARQ information that base station stored UE current TTI need to retransmit is: need to retransmit TB piece number is 2, represents with TBNumwait; Each TB piece is expressed as TBwait (0) and TBwait (1); The number of plies that each TB piece new biography is used is respectively 1 and 1, uses respectively Ltb (0) and Ltb (1) to represent, the number of plies that each TB piece is used is altogether 2; The MCS that each TB piece is used is respectively 11 and 9, uses respectively MCStb (0) and MCStb (1) to represent; Each TB piece number of retransmissions is respectively 1 time and 1 time, uses respectively RetransNumtb (0) and RetransNumtb (1) to represent.Base station receives and storage UE reports recently order indication RI and channel quality indicator CQI information are: the order that UE reports is recently designated as 2, with RIreport, represents; Each layer uses Lr (0) and Lr (1) to represent successively; As shown in Table 1, the upper code word that can transmit of RIreport (or TB piece) number is 2, with Ncwreport, represents, each code word uses CW (0) and CW (1) to represent successively; The CQI that UE reports is recently 8 and 5, uses successively CQIreport (0) and CQIreport (1) to represent.

Step 2: rank adaptation processing is carried out in base station, obtains the layer that UE current TTI is used, and with Ladaptive (comprising the number of plies and position thereof), represents.Making Ladaptive is that in 2, Ladaptive every layer uses La (0) and La (1) to represent successively.

Step 3: the order indication that the layer that the number of plies that base station is used according to each new biography TB piece under the HARQ of UE and MCS, rank adaptation calculating UE current TTI are used and UE the last time report and channel quality are indicated and determined the TB number of UE current TTI HARQ to be retransmitted and the MCS that each TB piece is used.Be handled as follows:

Step 3.1: total number of plies Lneed that relatively new biography of the TB piece of the HARQ of UE transmission is used and rank adaptation calculate the layer Ladaptive that UE current TTI is used.Lneed equals Ladaptive, enters step 3.2;

Step 3.2: calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, use successively MCSneed (0) and MCSneed (1) to represent.Making MCSneed (0) is that 12, MCSneed (1) is 10, enters step 3.5;

Step 3.5: the MCStb (i) using according to each new biography TB piece under the HARQ of UE is handled as follows with the relation of the MCSneed (k) that the corresponding TB piece of UE current TTI needed layer Lneed adopts:

Judgement TBNumwait=2,

Further judgement MCStb (i) meets formula (1.4) with MCSneed (k),

If meet formula (1.4), retransmit these two TB pieces (TBwait (0) and TBwait (1)), wherein, the MCS that TBwait (0) adopts is MCStb (0), the code word of employing is code word 0; The MCS that TBwait (1) adopts is MCStb (1), and the code word of employing is code word 1.Flow process finishes.

Application example 2:

Under the mimo channel of 4 transmitting antennas and 4 reception antennas, UE is adopted to the large CDD of delay transmission mode.Making α is 0.7.

Step 1: the HARQ information that base station stored UE current TTI need to retransmit is: need to retransmit TB piece number is 2, represents with TBNumwait; Each TB piece is expressed as TBwait (0) and TBwait (1); The number of plies that each TB piece new biography is used is respectively 1 and 2, and wherein, the layer that TBwait (0) is used is Ltb (0), and the layer that TBwait (1) is used is Ltb (1) and Ltb (2), and the number of plies that each TB piece is used is altogether 3, with Lneed, represents; The MCS that each TB piece is used is respectively 19 and 18, uses respectively MCStb (0) and MCStb (1) to represent; Each TB piece number of retransmissions is respectively 1 time and 2 times, uses respectively RetransNumtb (0) and RetransNumtb (1) to represent.Base station receives and storage UE reports recently order indication RI and channel quality indicator CQI information are: the order that UE reports is recently designated as 4, with RIreport, represents; Each layer uses Lr (0), Lr (1), Lr (2) and Lr (3) to represent successively; As shown in Table 2, the upper code word that can transmit of RIreport (or TB piece) number is 2, with Ncwreport, represents, each code word uses CW (0) and CW (1) to represent successively; The CQI that UE reports is recently 10, with CQIreport (0), represents;

Step 2: rank adaptation processing is carried out in base station, obtains the layer that UE current TTI is used, and with Ladaptive (comprising the number of plies and position thereof), represents.Making Ladaptive is that in 4, Ladaptive every layer uses La (0) and La (1) to represent successively;

Step 3: the order indication that the layer that the number of plies that base station is used according to each new biography TB piece under the HARQ of UE and MCS, rank adaptation calculating UE current TTI are used and UE the last time report and channel quality are indicated and determined the TB number of UE current TTI HARQ to be retransmitted and the MCS that each TB piece is used, and are handled as follows:

Step 3.1: total number of plies Lneed that relatively new biography of the TB piece of the HARQ of UE transmission is used and rank adaptation calculate the layer Ladaptive that UE current TTI is used.From step 1, Lneed is 3, and from step 2, Ladaptive is 4, and judgement Lneed is less than Ladaptive, enters step 3.3;

Step 3.3: the order indication RIreport reporting recently according to UE and channel quality indicator (CQI) report (p) and weighted factor β calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSa (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}, making weighted factor β is 0.7

Employing following steps are calculated:

By CQIreport (p) and CQI and spectrum efficiency mapping relations, draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports.Spectrum efficiency on every layer is respectively: SpecEffr (0)=2.7305, SpecEffr (1)=2.7305, SpecEffr (2)=2.7305, SpecEffr (3)=2.7305;

Calculate the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed, adopt formula (1.1) to calculate, obtaining SpecEffneed (0) is 2.548, SpecEffneed (1) is that 2.548, SpecEffneed (2) is 2.548;

Further calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1}, adopts with the following method:

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word.The mean value of the corresponding spectrum efficiency of layer comprising in code word is designated as to the spectrum efficiency in this code word.Wherein, the upper corresponding layer of code word CW (0) is Ltb (0), and the spectrum efficiency in this code word is SpecEffneed (0) (2.548); The upper corresponding layer of code word CW (1) is Ltb (1) and Ltb (2), and the spectrum efficiency in this code word is the mean value (2.548) of SpecEffneed (1) and SpecEffneed (2);

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use.Wherein, the MCS that code word CW (0) is used is 16, and the MCS that code word CW (1) is used is 16;

The MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits, and enters step 3.5;

Step 3.5: the MCStb (i) using according to each new biography TB piece under the HARQ of UE is handled as follows with the relation of the MCSneed (k) that the corresponding TB piece of UE current TTI needed layer Lneed adopts:

Judgement TBNumwait=2,

Further judgement MCStb (i) does not meet formula (1.4) and formula (1.5) with MCSneed (k),

Further judgement does not meet formula (1.6),

Further judgement MCStb (0) and MCStb (1) all meet formula (1.7),

Further the number of retransmissions of judgement TBwait (1) is greater than the number of retransmissions of TBwait (0), therefore getting TBwait (1) retransmits, and the MCS retransmit using is the MCS that TBwait (1) new biography is used, 18, the code word of employing is code word 0.Flow process finishes.

It is to be noted; the above is the preferred embodiment of the present invention; be not limited to the technical solution; being equal to that any those of ordinary skill in the art do the technology of the present invention feature replaced or corresponding improvement; still, within protection scope of the present invention, scope of patent protection of the present invention should be as the criterion with claims.

Claims (12)

1. a HARQ retransmission processing method under space multiplexing mode, is characterized in that, described method comprises:

The mixed self-adapting of base station stored user equipment (UE) retransmits the number of times that the number of plies that the new biography of the transmission block TB of HARQ transmission uses and modulation coding mode MCS parameter and each TB piece retransmit, and receives and order indication and channel quality indication (CQI) information that storage UE the last time reports;

Rank adaptation processing is carried out in base station, obtains the layer that UE current transmission time interval TTI is used;

The number of times of the number of plies that the new biography of the TB piece of the HARQ transmission of the described UE of base station foundation is used and MCS parameter, each TB piece re-transmission, the order indication that described UE the last time reports and channel quality indication (CQI) information and described rank adaptation are processed the layer of the UE current TTI use obtaining, and determine the TB piece of UE current TTI HARQ to be retransmitted and the MCS of each TB piece use.

2. the method for claim 1, it is characterized in that, the layer that the UE current TTI that the number of times of the number of plies that described base station is used according to the new biography of the TB piece of the HARQ transmission of UE and MCS parameter, each TB piece re-transmission, the order indication that described UE the last time reports and channel quality indication (CQI) information and the processing of described rank adaptation obtain is used is determined the TB piece of UE current TTI HARQ to be retransmitted and the MCS that each TB piece is used, and comprising:

Total number of plies Lneed that relatively new biography of the TB piece of the HARQ of UE transmission is used and rank adaptation calculate the layer Ladaptive that UE current TTI is used, and process according to comparative result.

3. method as claimed in claim 2, is characterized in that, describedly according to comparative result, processes, and comprising:

When Lneed is less than Ladaptive:

According to the order that UE the last time reports, indicate RIreport and channel quality indicator (CQI) report (p) and weighted factor β to calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}; The span of weighted factor β be β ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is larger, β is also larger, TBNumwait is that UE treats the TB piece number that HARQ retransmits in current TTI;

Comprise the following steps:

By CQI and spectrum efficiency mapping relations and CQIreport (p), draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (l) expression on every layer, wherein, l ∈ { 1, ..., RIreport};

Obtain the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed,

Order $\mathrm{SpecEffneed}\left(n\right)=\frac{\mathrm{\&beta;}*\underset{l=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---\left(1.1\right)$

Wherein, n ∈ 0 ..., Lneed-1};

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1},

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, and the corresponding spectrum efficiency mean value of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use, the MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits.

4. method as claimed in claim 2, is characterized in that, describedly according to comparative result, processes, and also comprises:

When Lneed is greater than Ladaptive:

According to the order that UE the last time reports, indicate RIreport and channel quality indicator (CQI) report (p) and weighted factor γ to calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1}, γ ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is less, γ is also less; TBNumwait is that UE treats the TB piece number that HARQ retransmits in current TTI;

Comprise the following steps:

By CQI and spectrum efficiency mapping relations and CQIreport (p), draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (l) expression on every layer, wherein, l ∈ { 1, ..., RIreport};

Obtain the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed,

Order $\mathrm{SpecEffneed}\left(n\right)=\frac{\mathrm{\&gamma;}*\underset{l=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---(1.2)$

Wherein, n ∈ 0 ..., Lneed-1};

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1},

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, and the mean value of the corresponding spectrum efficiency of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use; The MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits.

5. the method as described in claim 3 or 4 any one, is characterized in that, described method also comprises:

The MCStb (i) using according to each new biography TB piece under the HARQ of UE is handled as follows with the relation of the MCSneed (k) that the corresponding TB piece of UE current TTI needed layer Lneed adopts:

When re-transmitting data block is counted TBNumwait=1, judge whether MCStb (i) and MCSneed (k) meet:

MCSneed(0)≥MCStb(0) (1.3)

Wherein, MCStb (i) represents the MCS that each TB piece is used;

If met, retransmit this TB piece, and the MCS adopting is MCStb (0);

If do not met, this TTI does not retransmit the TB piece under this HARQ.

6. method as claimed in claim 5, is characterized in that, described method also comprises:

When re-transmitting data block is counted TBNumwait=2, judge whether MCStb (i) and MCSneed (k) meet:

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\end{array}\right.---\left(1.4\right)$

Or whether meet:

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\end{array}\right.---\left(1.5\right)$

If meet formula (1.4), retransmit these two and treat re-transmitting data block TBwait (0) and TBwait (1), and the MCS adopting is respectively MCStb (0) and MCStb (1);

If meet formula (1.5), retransmit TBwait (0) and TBwait (1), and the MCS adopting is respectively MCStb (1) and MCStb (0);

If all do not meet, further judge whether to meet:

MCSneed(k)≥MCStb(i) (1.6)

Wherein, i, k ∈ 0 ..., TBNumwait-1}, and i ≠ k;

If met, retransmit TBwait (i), and the MCS adopting is MCStb (i);

If do not meet, further judge whether to meet:

$\mathrm{MCStb}\left(i\right)\&le;\mathrm{\&alpha;}*\underset{k=0}{\overset{\mathrm{TBNumwait}-1}{\mathrm{\&Sigma;}}}\mathrm{MCSneed}\left(k\right)---\left(1.7\right)$

Wherein, α is weighted factor, value be α ∈ (0,1] (be greater than 0 and be less than or equal to 1 value), i, k ∈ 0 ..., TBNumwait-1}; TBwait (i) represents each TB piece;

If two MCStb (0) and MCStb (1) all meet formula (1.7), get that TB piece that in these 2 TB pieces, number of retransmissions is large and retransmit, and retransmit the MCS that the MCS using is the TB piece new biography use that described number of retransmissions is large; If number of retransmissions is the same in these 2 TB pieces, get the corresponding TB piece of MCS less in MCStb (0) and MCStb (1) and retransmit, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission; Otherwise an optional TB piece retransmits, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission.

7. a HARQ retransmission process device under space multiplexing mode, is characterized in that, described device comprises:

Information and memory module, for storing the mixed self-adapting of user equipment (UE), retransmit the number of times information that the number of plies that the new biography of the transmission block TB of HARQ transmission uses and modulation coding mode MCS parameter and each TB piece retransmit, receive and store order indication and channel quality indication (CQI) information that UE the last time reports, described canned data is sent to HARQ retransmission process module;

Rank adaptation processing module, the layer using for obtaining UE current transmission time interval TTI, and send to HARQ retransmission process module;

HARQ retransmission process module, for receiving the number of plies and MCS parameter, the number of times information that each TB piece retransmits, the order that UE the last time reports that the new biography of TB of the HARQ transmission of the UE that information and memory module send uses, indicate and channel quality indication (CQI) information, the layer that the UE that reception rank adaptation processing module is sent is used in current TTI, process, and the MCS of the TB piece of definite UE current TTI HARQ to be retransmitted and the use of each TB piece.

8. device as claimed in claim 7, it is characterized in that, described HARQ retransmission process module, is further used for total number of plies Lneed and rank adaptation that the new biography of TB piece of the HARQ transmission of comparison UE uses and calculates the layer Ladaptive that UE current TTI is used, and process according to comparative result.

9. device as claimed in claim 8, is characterized in that, described HARQ retransmission process module, is further used for:

When Lneed is less than Ladaptive:

According to the order that UE the last time reports, indicate RIreport and channel quality indicator (CQI) report (p) and weighted factor β to calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ { 0, ..., TBNumwait-1}; The span of weighted factor β be β ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is larger, β is also larger, TBNumwait is that UE treats the TB piece number that HARQ retransmits in current TTI;

By CQI and spectrum efficiency mapping relations and CQIreport (p), draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (j) expression on every layer, wherein, j ∈ { 1, ..., RIreport};

Obtain the spectrum efficiency SpecEffneed (k) on corresponding every layer of the needed layer of UE current TTI Lneed,

Order $\mathrm{SpecEffneed}\left(k\right)=\frac{\mathrm{\&beta;}*\underset{j=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(j\right)}{\mathrm{Lneed}}---\left(1.1\right)$

Wherein, k ∈ 0 ..., Lneed-1};

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1},

Spectrum efficiency SpecEffneed (k) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, and the corresponding spectrum efficiency mean value of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use, the MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits.

10. device as claimed in claim 8, is characterized in that, described HARQ retransmission process module, is further used for:

When Lneed is greater than Ladaptive:

According to the order that UE the last time reports, indicate RIreport and channel quality indicator (CQI) report (p) and weighted factor γ to calculate the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1}, γ ∈ (0,1], relevant with Lneed and Ladaptive, when Ladaptive/Lneed ratio is less, γ is also less; TBNumwait is that UE treats the TB piece number that HARQ retransmits in current TTI;

By CQI and spectrum efficiency mapping relations and CQIreport (p), draw the spectrum efficiency on corresponding every layer of RIreport that UE the last time reports, SpecEffr for spectrum efficiency (l) expression on every layer, wherein, l ∈ { 1, ..., RIreport};

Obtain the spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed,

Order $\mathrm{SpecEffneed}\left(n\right)=\frac{\mathrm{\&beta;}*\underset{l=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\&Sigma;}}}\mathrm{SpecEffr}\left(l\right)}{\mathrm{Lneed}}---\left(1.2\right)$

Wherein, n ∈ 0 ..., Lneed-1};

Obtain the MCS that the corresponding TB piece of UE current TTI needed layer Lneed adopts, with MCSneed (k), represent, wherein, k ∈ 0 ..., TBNumwait-1},

Spectrum efficiency SpecEffneed (n) on corresponding every layer of the needed layer of UE current TTI Lneed is incorporated in code word, and the mean value of the corresponding spectrum efficiency of layer comprising in code word is designated as to the spectrum efficiency in this code word;

The MCSneed (k) that the spectrum efficiency of code word of using according to UE current TTI and the mapping relations of spectrum efficiency and MCS are determined the code word of current use;

The MCS using in each code word is the MCS that each TB piece can be used when current TTI retransmits.

11. devices as described in claim 9 or 10 any one, is characterized in that, described HARQ retransmission process module, is further used for:

The MCStb (i) using according to each new biography TB piece under the HARQ of UE is handled as follows with the relation of the MCSneed (k) that the corresponding TB piece of UE current TTI needed layer Lneed adopts:

When re-transmitting data block is counted TBNumwait=1, judge whether MCStb (i) and MCSneed (k) meet:

MCSneed(0)≥MCStb(0) (1.3)

Wherein, MCStb (i) represents the MCS that each TB piece is used;

If met, retransmit this TB piece, and the MCS adopting is MCStb (0);

If do not met, this TTI does not retransmit the TB piece under this HARQ.

12. devices as claimed in claim 11, is characterized in that, described HARQ retransmission process module, is further used for:

When re-transmitting data block is counted TBNumwait=2, judge whether MCStb (i) and MCSneed (k) meet:

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\end{array}\right.---\left(1.4\right)$ Or whether meet:

$\left\{\begin{array}{c}\mathrm{MCSneed}\left(0\right)\&GreaterEqual;\mathrm{MCStb}\left(1\right)\\ \mathrm{MCSneed}\left(1\right)\&GreaterEqual;\mathrm{MCStb}\left(0\right)\end{array}\right.---\left(1.5\right)$

If meet formula (1.4), retransmit these two and treat re-transmitting data block TBwait (0) and TBwait (1), and the MCS adopting is respectively MCStb (0) and MCStb (1);

If meet formula (1.5), retransmit TBwait (0) and TBwait (1), and the MCS adopting is respectively MCStb (1) and MCStb (0);

If all do not meet, further judge whether to meet:

MCSneed(k)≥MCStb(i) (1.6)

Wherein, i, k ∈ 0 ..., TBNumwait-1}, and i ≠ k;

If met, retransmit TBwait (i), and the MCS adopting is MCStb (i);

If do not meet, further judge whether to meet:

$\mathrm{MCStb}\left(i\right)\&le;\mathrm{\&alpha;}*\underset{k=0}{\overset{\mathrm{TBNumwait}-1}{\mathrm{\&Sigma;}}}\mathrm{MCSneed}\left(k\right)---\left(1.7\right)$

Wherein, α is weighted factor, value be α ∈ (0,1] (be greater than 0 and be less than or equal to 1 value),

I, k ∈ 0 ..., TBNumwait-1}; TBwait (i) represents each TB piece;

If two MCStb (0) and MCStb (1) all meet formula (1.7), get that TB piece that in these 2 TB pieces, number of retransmissions is large and retransmit, and retransmit the MCS that the MCS using is the TB piece new biography use that described number of retransmissions is large; If number of retransmissions is the same in these 2 TB pieces, get the corresponding TB piece of that MCS less in MCStb (0) and MCStb (1) and retransmit, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission; Otherwise an optional TB piece retransmits, and the MCS of the MCS retransmit the using TB piece new biography use that be this re-transmission.