CN102255684B - Multi-input and multi-output channel adaptation method and device - Google Patents

Abstract

The invention discloses a multi-input and multi-output channel adaptation method and a multi-input and multi-output channel adaptation device. The method comprises that: a base station receives and stores rank indicator (RI) report layers and channel quality indicator (CQI) report of a channel represented by an RI reported by user equipment (UE), wherein RIreport is the number of the RIreport layers; the base station performs adaptive processing on the RIreport to obtain RIadaptive layers used by a current transmission time interval (TTI) of the UE, wherein RIadaptive is the number of the RIadaptive layers; and the base station compares the RIadaptive and the RIreport, computes the spectral efficiency SpecEffa of the RIadaptive layers according to a comparison result and the CQIreport, determines layers corresponding to the RIadaptive layers on codewords according to correspondence between the numbers and the codewords to obtain the spectral efficiency SpecEffa of each layer on the codewords, takes mean values of the spectral efficiency SpecEffa of all the layers on the same codewords as the spectral efficiency on the codewords, and determines modulation and coding schemes (MCS) on the codewords according to the spectral efficiency on the codewords and mapping relationships between the spectral efficiency and the MCSs. In the method and the device, the MCSs of the adapted codewords are determined by the RIreport of the channel represented by the RI reported by the UE and the CQIreport, so the capacity of a multi-input and multi-output (MIMO) channel can be more fully utilized.

Description

The adaptive method of a kind of multi-input multi-ouput channel and device

Technical field

The present invention relates to communication technical field, particularly the adaptive method of a kind of multi-input multi-ouput channel and device.

Background technology

In wireless communication system, be the transmission rate of raising data and the throughput of system, can adopt multiple-input and multiple-output (Multi-Input and Multi-Output, MIMO) technology, by with a kind of transfer of data of obtaining system the mode of the throughput of high system transmit one or more data flow via mimo channel, the performance that the realization system is good.

The realization approach of MIMO technology mainly contains two kinds: space diversity and spatial reuse.In the LTE system, for spatial multiplexing mode, (User Equipment UE) need feed back the mimo channel rank of matrix to network side to subscriber equipment, and the order that network side reports according to UE is carried out the self adaptation emission of order.Spatial reuse comprises two kinds of transmission modes: postpone cyclic delay diversity (Large Delay CDD (Cyclic Delay Diversity)) transmission mode and closed-loop MIMO transmission mode greatly.

Changing condition from order in the prior art carries out the self adaptation adjustment to the channel number of plies, but and unresolved channel layer is counted modulation coding mode that code word is used (Modulation and Coding Scheme after the self adaptation adjustment, MCS) problem, and that the MCS on the code word determines is not accurate enough, can cause utilizing fully efficiently the problem of mimo channel capacity.

Summary of the invention

The object of the present invention is to provide the adaptive method of a kind of multi-input multi-ouput channel and device, solved when the number of plies of mimo channel changes, the MCS on the code word determines inaccurate and then causes the mimo channel capacity to utilize inadequate problem.

According to an aspect of the present invention, provide a kind of multi-input multi-ouput channel adaptive method, said method comprising the steps of:

RIreport layer and the channel quality indication (CQI) information CQIreport of the represented channel of order indication RI that the base station receives and the storage subscriber equipment reports recently, described RIreport are the number of plies of the RIreport layer of the represented channel of described order indication RI;

Self-adaptive processing is carried out to described RIreport in the base station, obtains the RIadaptive layer that subscriber equipment current transmission time interval TTI uses, and described RIadaptive is the number of plies of the RIadaptive layer of described current TTI use;

The size of the more described RIadaptive in base station and described RIreport, and calculate the spectrum efficiency SpecEffa of each layer of described Riadaptive layer according to comparative result and described CQIreport; According to the default number of plies and the corresponding relation of code word determine on the corresponding code word of described Riadaptive layer and the described code word layer, obtain the spectrum efficiency SpecEffa of each layer on the described code word, and with the mean value of the spectrum efficiency SpecEffa of all layers on the same code word as the spectrum efficiency on this code word; Determine MCS on the code word according to the mapping relations of the spectrum efficiency on the code word and spectrum efficiency and MCS.

According to a further aspect in the invention, provide a kind of multi-input multi-ouput channel adaptive device, described device comprises:

The number of plies and channel quality indication (CQI) information memory module, indicate RIreport layer and the channel quality indication (CQI) information CQIreport of the represented channel of RI for the order that receives and the storage subscriber equipment reports recently, and send, described RIreport is the number of plies of the RIreport layer of the represented channel of described order indication RI;

Number of plies self-adaptive processing module is used for described RIreport is carried out self-adaptive processing, obtains the RIadaptive layer that the subscriber equipment current TTI is used, and described RIadaptive is the number of plies of the RIadaptive layer of described current TTI use;

The MCS determination module, the size that is used for more described RIadaptive and described RIreport, and calculate the spectrum efficiency SpecEffa of each layer of described RIadaptive layer according to comparative result and described CQIreport, determine spectrum efficiency on the corresponding code word of described RIadaptive layer and the described code word according to the corresponding relation of the default number of plies and code word then, determine MCS on the code word according to the mapping relations of the spectrum efficiency on the code word and spectrum efficiency and MCS.

Compared with prior art, beneficial effect of the present invention is: in the present invention, the RIreport layer of the represented channel of order indication RI by user equipment to report and channel quality indication (CQI) information CQIreport determine the MCS on the code word after the self adaptation, can utilize the capacity of mimo channel more fully.

Description of drawings

Fig. 1 is the flow chart of a kind of multi-input multi-ouput channel adaptive approach of providing of the embodiment of the invention;

Fig. 2 is the concrete process chart of a kind of multi-input multi-ouput channel adaptive approach of providing of the embodiment of the invention;

Fig. 3 is the legend of the embodiment one of a kind of multi-input multi-ouput channel adaptive approach of providing of the embodiment of the invention;

Fig. 4 is the legend of the embodiment two of a kind of multi-input multi-ouput channel adaptive approach of providing of the embodiment of the invention;

Fig. 5 is the block diagram of a kind of multi-input multi-ouput channel self-reacting device of providing of the embodiment of the invention;

Fig. 6 is the structure refinement schematic diagram of the MCS determination module shown in Fig. 5.

Embodiment

, should be appreciated that following illustrated preferred embodiment only is used for description and interpretation the present invention, and be not used in restriction the present invention a preferred embodiment of the present invention will be described in detail below in conjunction with accompanying drawing.

Fig. 1 is the flow process of a kind of multi-input multi-ouput channel adaptive approach of providing of the embodiment of the invention, as shown in Figure 1, said method comprising the steps of:

Among the step S101, the order that the base station receives and the storage subscriber equipment reports is recently indicated RIreport layer and the channel quality indication (CQI) information CQIreport of represented channel.

In this step, RIreport is the number of plies of the RIreport layer of the represented channel of described order indication RI, and every layer with Lr (i) expression, wherein i ∈ 0,1 ...., RIreport-1}.RIreport corresponding each layer go up code word (the perhaps TB piece) number that can transmit and represent with Ncwreport, code word is with CW (i) expression, wherein i ∈ 0,1 ...., Ncwreport-1}.Channel quality indication (CQI) information that subscriber equipment reports recently is with CQIreport (i) expression, wherein i ∈ 0,1 ...., Ncwreport-1}.Also comprise in the information of user equipment to report in this step in addition current transmission time interval (Transmission Time Interval, TTI).

For the LTE system, the corresponding relation of the described number of plies and code word is as shown in Table 1 and Table 2: for the mimo channel of 2 transmitting antennas, 2 reception antennas, the corresponding relation of the number of plies and code word is as shown in table 1, and for the mimo channel of 4 transmitting antennas, 4 reception antennas, the corresponding relation of the number of plies and code word is as shown in table 2.

Table 1

Table 2

Among the step S102, self-adaptive processing is carried out to described RIreport in the base station, obtain the RIadaptive layer that the subscriber equipment current TTI is used, described RIadaptive is the number of plies of the RIadaptive layer of described current TTI use, every layer with La (i) expression, and wherein i ∈ { 0,1, ...., RIadaptive-1}.

For the LTE system, the described number of plies and the layer the position mapping relations as shown in Table 1 and Table 2: for the mimo channel of 2 transmitting antennas, 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 antennas, 4 reception antennas, the number of plies is as shown in table 2 with the position mapping relations of layer.

Among the step S103, the size of RIreport and RIadaptive is compared in the base station, calculate the spectrum efficiency SpecEffa of each layer of RIadaptive layer according to comparative result and CQIreport, and further determine spectrum efficiency on the code word, determine MCS on the code word according to the mapping relations of the spectrum efficiency on the described code word and spectrum efficiency and MCS.

In this step, code word on corresponding each layer of RIadaptive layer is determined according to the corresponding relation of the number of plies and code word in the base station, obtain the spectrum efficiency SpecEffa of each layer of described code word place, and with the mean value of the spectrum efficiency SpecEffa of all layers on the same code word spectrum efficiency as this code word.

Fig. 2 is the concrete handling process of a kind of multi-input multi-ouput channel adaptive approach of providing of the embodiment of the invention, as shown in Figure 2, said method comprising the steps of:

Among the step S201, RIreport layer and the channel quality indication (CQI) information CQIreport of the represented channel of order indication RI that the base station receives and the storage subscriber equipment reports recently.

In this step, described RIreport is the number of plies of the RIreport layer of the represented channel of described order indication RI, and every layer with Lr (i) expression, wherein i ∈ 0,1 ...., RIreport-1}.RIreport corresponding each layer go up code word (the perhaps TB piece) number that can transmit and represent with Ncwreport, code word is with CW (i) expression, wherein i ∈ 0,1 ...., Ncwreport-1}.Channel quality indication (CQI) information that subscriber equipment reports recently is with CQIreport (i) expression, wherein i ∈ 0,1 ...., Ncwreport-1}.Also comprise in the information of user equipment to report in this step in addition current transmission time interval (Transmission Time Interval, TTI).

Among the step S202, self-adaptive processing is carried out to described RIreport in the base station, obtain the RIadaptive layer that the subscriber equipment current TTI is used, described RIadaptive is the number of plies of the RIadaptive layer of described current TTI use, every layer with La (i) expression, and wherein i ∈ { 0,1, ...., RIadaptive-1}.

Among the step S203, the base station obtains the spectrum efficiency SpecEffr (i) of RIreport layer according to the mapping relations (in the LTE system, the mapping relations of CQI and spectrum efficiency are as shown in table 3) of CQIreport (i) and CQI and spectrum efficiency, wherein i ∈ { 0,1 ...., RIreport-1}.

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 3

Among the step S204, the size of RIadaptive and RIreport is compared in the base station.

In this step, when RIadaptive equals RIreport, execution in step S205, as RIadaptive during less than RIreport, execution in step S206, as RIadaptive during greater than RIreport, execution in step S209.

Among the step S205, the spectrum efficiency SpecEffa of described RIadaptive layer (i) is followed successively by the spectrum efficiency SpecEffr (i) of described RIreport layer;

Among the step S206, setting up the one-to-one relationship of the layer of RIadaptive in each layer and described RIreport layer in the described RIadaptive layer by mapping, is SpecEffa_initial (i)=SpecEffr (i) with the spectrum efficiency SpecEffr (i) of each layer of RIadaptive in the described RIreport layer layer as the initial spectrum efficient SpecEffa_initial (i) of corresponding each layer in the RIadaptive layer.

In the embodiment of the invention, can be in the RIreport layer beginning to choose successively RIadaptive layer from the front and shine upon successively with each layer the RIadaptive layer, is SpecEffa_initial (i)=SpecEffr (i) with the initial spectrum efficient SpecEffa_initial (i) that obtains the RIadaptive layer.

Among the step S207, the spectrum efficiency SpecEffr (i) of remaining layer in the RIreport layer is calculated the increment spectrum efficiency deltaSpecEff of RIadaptive layer.

In the embodiment of the invention, when previous step begins from the front to choose successively after RIadaptive layer shine upon successively with each layer the RIadaptive layer, then can utilize formula to the spectrum efficiency of remaining afterwards (RIreport-RIadaptive) in the RIreport layer layer in the RIreport layer Calculate the increment spectrum efficiency deltaSpecEff of RIadaptive layer, wherein α is weighted factor, value be α ∈ (0,1] (greater than 0 and smaller or equal to 1 value).

Among the step S208, be the spectrum efficiency SpecEffa (i) that SpecEffa (i)=SpecEffa_initial (i)+deltaSpecEff obtains described RIadaptive layer to above-mentioned SpecEffa_initial (i) with the deltaSpecEff summation.

Among the step S209, utilize formula Calculate the spectrum efficiency SpecEffa (i) of RIadaptive layer, wherein β is weighted factor, value be β ∈ (0,1] (greater than 0 and smaller or equal to 1 value).

Among the step S210, according to the corresponding relation (referring to table 1 and table 2) of the number of plies and code word determine on the corresponding code word of RIadaptive layer and the described code word the layer, and then obtain the spectrum efficiency SpecEffa of each layer on the described code word, and with the mean value of the spectrum efficiency SpecEffa of all layers on the same code word as the spectrum efficiency on this code word.

Among the step S211, determine the MCS of code word according to the mapping relations of the spectrum efficiency on the described code word and spectrum efficiency and MCS.

In this step, the mapping relations of described spectrum efficiency and MCS are as shown in table 4.Particularly, an immediate corresponding MCS of spectrum efficiency in the limited spectrum efficiency of listing in the spectrum efficiency on the code word and the table 4 is MCS on the described code word.

MCS	Spectrum efficiency
		0	0.2344
1	0.3057
		2	0.377
3	0.4893
		4	0.6016
5	0.7393
		6	0.877
7	1.0264
		8	1.1758
9	1.3262
		10	1.3262
11	1.4766
		12	1.69535
13	1.9141
		14	2.1602
15	2.4063
		16	2.5684
17	2.5684
		18	2.7305
19	3.0264
		20	3.3223
21	3.6123
		22	3.9023
23	4.21285
		24	4.5234
25	4.8193
		26	5.1152
27	5.33495
		28	5.5547

Table 4

Said method is applicable to big delay cyclic delay diversity (Large Delay CDD (Cyclic DelayDiversity)) transmission mode and closed-loop MIMO transmission mode.Wherein, for big delay CDD transmission mode, the channel quality indication (CQI) information CQI on each layer of channel is approaching or equates, so subscriber equipment only reports a CQIreport; For the closed-loop MIMO transmission mode, the channel quality indication (CQI) information CQI on each layer of channel may keep off or unequal, and subscriber equipment reports a CQIreport according to the mode of stream to each stream.

Below in conjunction with specific embodiment a kind of multi-input multi-ouput channel adaptive approach provided by the invention is elaborated.

Embodiment one:

Under the mimo channel of 2 transmitting antennas and 2 reception antennas, subscriber equipment is adopted the closed-loop MIMO transmission mode, the RIreport layer of the channel that the order that subscriber equipment reports recently is represented, wherein RIreport is 3, the CQIreport that reports recently is 8 and 5, with reference to Fig. 3.

Step S1201, the RIreport layer of the channel that the order indication that the base station receives and the storage subscriber equipment reports recently is represented, wherein said RIreport is 3, each layer is respectively Lr (0), Lr (1) and Lr (2); Code word on the RIreport (perhaps TB piece) number Ncwreport is 2, is respectively CW (0) and CW (1) (perhaps TB (0) and TB (1)); The base station receives and the channel quality indicator (CQI) report (0) of storage is that 8, CQIreport (1) is 5.

Step S1202, self-adaptive processing is carried out to described RIreport in the base station, obtains the RIadaptive layer that the subscriber equipment current TTI is used, and wherein RIadaptive is 3, and each layer is La (0), La (1) and La (2).

Step S1203, the base station is 1.9141 according to the spectrum efficiency SpecEffr (0) that the mapping relations (table 3) of CQIreport (i) and CQI and spectrum efficiency obtain Lr (0), the spectrum efficiency SpecEffr (1) of Lr (1) is that the spectrum efficiency SpecEffr (2) of 0.8770, Lr (2) is 0.8770.

Step S 1204, the size of RIadaptive and RIreport relatively since RIadaptive and RIreport equate execution in step S1205.

Step S1205, the spectrum efficiency SpecEffa of described RIadaptive layer (i) are followed successively by the spectrum efficiency SpecEffr (i) of described RIreport layer.The spectrum efficiency that is La (0) is that the spectrum efficiency of SpecEffa (0)=SpecEffr (0)=1.9141, La (1) is that the spectrum efficiency of SpecEffa (1)=SpecEffr (1)=0.8770 and La (2) is SpecEffa (2)=SpecEffr (2)=0.8770, execution in step SA210.

Step S1210, according to the corresponding relation (referring to table 1) of the number of plies and code word determine on the corresponding code word of RIadaptive layer and the described code word the layer, and then obtain the spectrum efficiency SpecEffa of each layer on each code word, and with the mean value of the spectrum efficiency SpecEffa of all layers on the same code word as the spectrum efficiency on this code word.The layer that is CW (0) place is La (0), therefore the spectrum efficiency on the CW (0) is SpecEffa (0)=1.9141, the layer at code word CW (1) place is La (1) and La (2), so the spectrum efficiency on the CW (1) is (SpecEffa (1)+SpecEffa (2))/2=(0.8770+0.8770)/2=0.8770.

Step S1211, the spectrum efficiency on the described code word of foundation and the mapping relations (referring to table 4) of spectrum efficiency and MCS are determined the MCS on the code word.Be that spectrum efficiency 1.9141 on the code word CW (0) is the most approaching with the spectrum efficiency 1.9141 in the table 4, and spectrum efficiency 1.9141 corresponding MCS are 13, therefore, MCS on the code word CW (0) is 13, in like manner, the spectrum efficiency 0.8770 on the code word CW (1) is the most approaching with the spectrum efficiency 0.8771 in the table 4, and spectrum efficiency 0.877 corresponding MCS is 6, therefore, the MCS on the code word CW (1) is 6.

Embodiment two:

Under the mimo channel of 4 transmitting antennas and 4 reception antennas, subscriber equipment is adopted the big CDD of delay transmission mode, the RIreport layer of the channel that the order indication that subscriber equipment reports recently is represented, wherein RIreport is 4, the CQIreport that reports recently is 7, with reference to Fig. 3.

Step S2201, the RIreport layer of the channel that the order indication that the base station receives and the storage subscriber equipment reports recently is represented, wherein RIreport is 4, each layer is respectively Lr (0), Lr (1), Lr (2) and Lr (3); Code word on the RIreport (perhaps TB piece) number Ncwreport is 2, is respectively CW (0) and CW (1) (perhaps TB (0) and TB (1)); The base station receives and the channel quality indicator (CQI) report (0) of storage is that 7, CQIreport (1) is 7.

Step S2202, self-adaptive processing is carried out to described RIreport in the base station, obtains the RIadaptive layer that the subscriber equipment current TTI is used, and wherein RIadaptive is 2, and each layer is La (0), La (1).

Step S2203, the base station is 1.4766 according to the spectrum efficiency SpecEffr (0) that the mapping relations (table 3) of CQIreport (i) and CQI and spectrum efficiency obtain Lr (0), the spectrum efficiency SpecEffr (1) of Lr (1) is 1.4766, the spectrum efficiency SpecEffr (2) of Lr (2) is that the spectrum efficiency SpecEffr (3) of 1.4766, Lr (3) is 1.4766.

Step S2204, the size of RIadaptive and RIreport relatively, because RIadaptive is less than RIreport, execution in step S2206.

Step S2206, set up the one-to-one relationship of the layer of RIadaptive in each layer and described RIreport layer in the described RIadaptive layer by mapping, with the spectrum efficiency SpecEffr (i) of each layer of RIadaptive in the described RIreport layer layer initial spectrum efficient SpecEffa_initial (i) as corresponding each layer in the RIadaptive layer.

Present embodiment shines upon with the corresponding La of RIadaptive (0) and La (1) for choose Lr (0) and Lr (1) in the corresponding Lr of RIreport (0), Lr (1), Lr (2) and Lr (3), obtain initial spectrum efficient SpecEffa_initial (0)=SpecEffa (0)=1.4766 of La (0), the initial spectrum efficient SpecEffa_initial (1) of La (1)=SpecEffa (1)=1.4766.

Step S2207 calculates the increment spectrum efficiency deltaSpecEff of RIadaptive layer to the spectrum efficiency SpecEffr (i) of remaining layer in the RIreport layer.

Present embodiment is for to utilize formula to the spectrum efficiency of remaining Lr (2) in the RIreport layer and Lr (3)

Calculate deltaSpecEff=1.03362, wherein get α=0.7.

Step S2208, it is the spectrum efficiency SpecEffa (i) that SpecEffa (i)=SpecEffa_initial (i)+deltaSpecEff obtains described RIadaptive layer that above-mentioned SpecEffa_initial (i) is sued for peace with deltaSpecEff, the spectrum efficiency that is La (0) layer is SpecEffa (0)=2.51022, and the spectrum efficiency of La (1) layer is SpecEffa (1)=2.51022.

Step S2210, determine layer on code word that the RIadaptive layer is corresponding and the code word according to the corresponding relation (referring to table 2) of the number of plies and code word, and then obtain the spectrum efficiency SpecEffa of each layer on each code word, and with the mean value of the spectrum efficiency of all layers on the same code word as the spectrum efficiency on this code word.Be the layer at CW (0) place for La (0), so the spectrum efficiency on the CW (0) is SpecEffa (0)=2.51022, the layer at code word CW (1) place is La (1), so the spectrum efficiency on the CW (1) is SpecEffa (1)=2.51022.

Step S2211, the spectrum efficiency on the described code word of foundation and the mapping relations (referring to table 4) of spectrum efficiency and MCS are determined the MCS on the code word.Be that spectrum efficiency 2.51022 on the code word CW (0) is the most approaching with the spectrum efficiency 2.5684 in the table 4, and spectrum efficiency 2.5684 corresponding MCS are 16, therefore, MCS on the code word CW (0) is 16, in like manner, the spectrum efficiency 2.51022 on the code word CW (1) is the most approaching with the spectrum efficiency 2.5684 in the table 4, and spectrum efficiency 2.5684 corresponding MCS are 16, therefore, the MCS on the code word CW (1) is 16.

Fig. 5 is the block diagram of a kind of multi-input multi-ouput channel self-reacting device of providing of the embodiment of the invention, and Fig. 6 is the structure refinement figure of MCS determination module in the device shown in Figure 5, is elaborated below in conjunction with Fig. 5 and Fig. 6.

Described device comprises the number of plies and channel quality indication (CQI) information memory module 11, number of plies self-adaptive processing module 12 and MCS determination module 13.Wherein MCS determination module 13 further comprises spectrum efficiency calculating sub module 131, code word spectrum efficiency calculating sub module 132 and spectrum efficiency and the MCS mapping submodule 133 of layer.

The number of plies and channel quality indication (CQI) information memory module 11 receive and the order of storage user equipment to report is indicated RIreport layer and the channel quality indication (CQI) information CQIreport of the represented channel of RI, and send to MCS determination module 13,12 couples of described RIreport of number of plies self-adaptive processing module carry out self-adaptive processing, obtain the RIadaptive layer that the subscriber equipment current TTI is used, and described RIadaptive is sent to MCS determination module 13.

The spectrum efficiency calculating sub module 131 of the layer of MCS determination module 13 compares the size of RIadaptive and RIreport, determine the spectrum efficiency SpecEffa (i) of RIadaptive layer according to comparative result and CQIreport, wherein when RIadaptive equaled RIreport, the spectrum efficiency SpecEffa of described RIadaptive layer (i) was followed successively by the spectrum efficiency SpecEffr (i) of described RIreport layer; As RIadaptive during less than RIreport, at first picked at random RIadaptive layer shines upon one by one with the RIadaptive layer in the RIreport layer, be SpecEffa_initial (i)=SpecEffr (i) with the initial spectrum efficient SpecEffa_initial (i) that obtains the RIadaptive layer, then the spectrum efficiency SpecEffr (i) of remaining layer in the RIreport layer being calculated the increment spectrum efficiency deltaSpecEff of RIadaptive layer, is the spectrum efficiency SpecEffa (i) that SpecEffa (i)=SpecEffa_initial (i)+deltaSpecEff obtains described RIadaptive layer to above-mentioned SpecEffa_initial (i) with the deltaSpecEff summation at last; As RIadaptive during greater than RIreport, utilize formula

Calculate the spectrum efficiency SpecEffa (i) of described RIadaptive layer, β is weighted factor; Code word spectrum efficiency calculating sub module 132 is determined the corresponding code word of RIadaptive layer according to spectrum efficiency SpecEffa and the layer of the RIadaptive layer that the spectrum efficiency calculating sub module 131 of described layer obtains with the corresponding relation of code word, and then obtain the spectrum efficiency SpecEffa of each layer at each code word place, and with the mean value of the spectrum efficiency SpecEffa of all layers on the same code word as the spectrum efficiency on this code word, the spectrum efficiency on the described code word is sent to described spectrum efficiency and MCS mapping submodule 133; Spectrum efficiency on the code word that spectrum efficiency and MCS mapping submodule 133 obtain according to described code word spectrum efficiency calculating sub module 132 and spectrum efficiency and MCS and mapping relations are determined the MCS on the code word.

In sum, the present invention carries out self-adaptive processing by the RIreport in the RIreport layer of the order of user equipment to report being indicated the represented channel of RI and obtains the RIadaptive layer that current TTI is used, and determined MCS on the code word after the self adaptation to have realized taking full advantage of of mimo channel capacity better according to the RIadaptive that obtains and RIreport and CQIreport.

Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore, all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.

Claims (10)

1. the adaptive method of multi-input multi-ouput channel is characterized in that, said method comprising the steps of:

RIreport layer and the channel quality indication (CQI) information CQIreport of the represented channel of order indication RI that A. base station receives and the storage subscriber equipment reports recently, described RIreport are the number of plies of the RIreport layer of the represented channel of described order indication RI;

B. self-adaptive processing is carried out to described RIreport in the base station, obtains the RIadaptive layer that subscriber equipment current transmission time interval TTI uses, and described RIadaptive is the number of plies of the RIadaptive layer of described current TTI use;

C. the size of the more described RIadaptive in base station and described RIreport, and calculate the spectrum efficiency SpecEffa of each layer of described RIadaptive layer according to comparative result and described CQIreport; According to the default number of plies and the corresponding relation of code word determine on the corresponding code word of described RIadaptive layer and the described code word layer, obtain the spectrum efficiency SpecEffa of each layer on the described code word, and with the mean value of the spectrum efficiency SpecEffa of all layers on the same code word as the spectrum efficiency on this code word; Determine MCS on the code word according to the mapping relations of the spectrum efficiency on the code word and spectrum efficiency and modulation coding mode MCS.

2. method according to claim 1 is characterized in that, the spectrum efficiency SpecEffa that calculates described RIadaptive layer according to comparative result and described CQIreport among the described step C is specially:

Determine the spectrum efficiency SpecEffr (i) of described RIreport layer according to the mapping relations of described CQIreport and default CQI and spectrum efficiency, wherein i ∈ 0,1 ...., RIreport-1};

Calculate the spectrum efficiency SpecEffa (i) of described RIadaptive layer according to described comparative result and described SpecEffr (i), wherein i ∈ 0,1 ...., RIadaptive-1}.

3. method according to claim 2 is characterized in that, described comparative result is RIadaptive when equaling RIreport, and the spectrum efficiency SpecEffa of described RIadaptive layer (i) is followed successively by the spectrum efficiency SpecEffr (i) of described RIreport layer; Wherein i ∈ 0,1 ...., RIreport-1}.

4. method according to claim 2 is characterized in that, described comparative result is RIadaptive during greater than RIreport, utilizes formula $\mathrm{SpecEffa}\left(i\right)=\frac{\mathrm{\β}*\underset{j=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\Σ}}}\mathrm{SpecEffr}\left(j\right)}{\mathrm{RIadaptive}}$ Calculate the spectrum efficiency SpecEffa (i) of described RIadaptive layer, wherein β is weighted factor, and span is 0＜β≤1.

5. method according to claim 2, it is characterized in that, described comparative result is that RIadaptive is during less than RIreport, set up the one-to-one relationship of the layer of RIadaptive in each layer and described RIreport layer in the described RIadaptive layer by mapping, with the spectrum efficiency SpecEffr (i) of each layer of RIadaptive in the described RIreport layer layer initial spectrum efficient SpecEffa_initial (i) as corresponding each layer in the RIadaptive layer;

The spectrum efficiency SpecEffr (i) of remaining layer in the described RIreport layer is calculated the increment spectrum efficiency deltaSpecEff of described RIadaptive layer;

Summation obtains the spectrum efficiency SpecEffa (i) of each layer of described RIadaptive layer to described SpecEffa_initial (i) and deltaSpecEff.

6. method according to claim 5, it is characterized in that, the increment spectrum efficiency deltaSpecEff that described spectrum efficiency SpecEffr (i) to remaining layer in the described RIreport layer calculates described RIadaptive layer is specially the ÷ RIadaptive by [(spectrum efficiency of remaining layer and) * α], calculate the increment spectrum efficiency deltaSpecEff of described RIadaptive layer, wherein α is weighted factor, and span is 0＜α≤1.

7. adaptive device of multi-input multi-ouput channel is characterized in that described device comprises:

The number of plies and channel quality indication (CQI) information memory module, indicate RIreport layer and the channel quality indication (CQI) information CQIreport of the represented channel of RI for the order that receives and the storage subscriber equipment reports recently, and send, described RIreport is the number of plies of the RIreport layer of the represented channel of described order indication RI;

Number of plies self-adaptive processing module is used for described RIreport is carried out self-adaptive processing, obtains the RIadaptive layer that the subscriber equipment current TTI is used, and described RIadaptive is the number of plies of the RIadaptive layer of described current TTI use;

The MCS determination module, the size that is used for more described RIadaptive and described RIreport, and calculate the spectrum efficiency SpecEffa of each layer of described RIadaptive layer according to comparative result and described CQIreport, determine spectrum efficiency on the corresponding code word of described RIadaptive layer and the described code word according to the corresponding relation of the default number of plies and code word then, determine MCS on the code word according to the mapping relations of the spectrum efficiency on the code word and spectrum efficiency and modulation coding mode MCS.

8. device according to claim 7 is characterized in that, described MCS determination module further comprises:

The spectrum efficiency calculating sub module of layer, be used for calculating the spectrum efficiency SpecEffa of described RIadaptive layer, when described comparative result is RIadaptive when equaling RIreport, the spectrum efficiency SpecEffa of described RIadaptive layer (i) is followed successively by the spectrum efficiency SpecEffr (i) of described RIreport layer; Wherein i ∈ 0,1 ...., RIreport-1}; When described comparative result is RIadaptive during greater than RIreport, utilize formula $\mathrm{SpecEffa}\left(i\right)=\frac{\mathrm{\β}*\underset{j=0}{\overset{\mathrm{RIreport}-1}{\mathrm{\Σ}}}\mathrm{SpecEffr}\left(j\right)}{\mathrm{RIadaptive}}$ Calculate the spectrum efficiency SpecEffa (i) of described RIadaptive layer, wherein β is weighted factor, and span is 0＜β≤1; When described comparative result is that RIadaptive is during less than RIreport, the spectrum efficiency SpecEffr (i) of RIadaptive layer in the described RIreport layer of picked at random is as the initial spectrum efficient SpecEffa_initial (i) of described RIadaptive layer, the spectrum efficiency SpecEffr (i) of remaining layer in the described RIreport layer is calculated the increment spectrum efficiency deltaSpecEff of described RIadaptive layer, described SpecEffa_initial (i) and deltaSpecEff summation are obtained the spectrum efficiency SpecEffa (i) of each layer of described RIadaptive layer;

Code word spectrum efficiency calculating sub module, the corresponding relation that is used for the spectrum efficiency SpecEffa (i) of the described RIadaptive layer that the spectrum efficiency calculating sub module according to described layer obtains and the default number of plies and code word determine on the corresponding code word of described RIadaptive layer and the described code word layer, obtain the spectrum efficiency of each layer on the described code word, and with the mean value of the spectrum efficiency of all layers on the same code word as the spectrum efficiency on the code word;

Spectrum efficiency and MCS mapping submodule, the spectrum efficiency on the code word that is used for obtaining according to described code word spectrum efficiency calculating sub module and the mapping relations of spectrum efficiency and MCS are determined the MCS on the code word.

9. device according to claim 8 is characterized in that, the spectrum efficiency calculating sub module of described layer is determined the spectrum efficiency SpecEffr (i) of each layer of described RIreport layer according to the mapping relations of described CQIreport and the CQI that presets and spectrum efficiency.

10. device according to claim 8, it is characterized in that, the spectrum efficiency calculating sub module of described layer is that described RIadaptive sets up RIadaptive layer one-to-one relationship in each layer and described RIreport layer in the described RIadaptive layer during less than described RIreport by mapping at described comparative result, with the spectrum efficiency SpecEffr (i) of each layer of RIadaptive in the described RIreport layer layer initial spectrum efficient SpecEffa_initial (i) as corresponding each layer in the RIadaptive layer;

Multiply by weighted factor after the spectrum efficiency SpecEffr (i) of remaining layer in the described RIreport layer sued for peace, obtain the increment spectrum efficiency deltaSpecEff of described RIadaptive layer then divided by RIadaptive, wherein α is weighted factor, and span is 0＜α≤1.

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