CN101517929A - Method for reporting channel information in multiple antenna system - Google Patents

Abstract

The present invention provides a method of reporting downlink channel information to a base station in a multiple antenna system. The method includes reporting a single rank for overall subband, the overall subband comprising a plurality of subbands and reporting a CQI for the single rank for at least one subband. Radio resources required for reporting channel information can be reduced and signaling overheads can be minimized.

Description

Be used for method in multiaerial system reporting channel information

Technical field

The present invention relates to radio communication, and more particularly, relate to a kind of method of in multiaerial system, reporting downlink channel information.

Background technology

Since the generalization of information communication service, the appearance of various multimedia services, and appearance of high-quality service or the like is so the demand of communication service promptly increases.Research to various wireless communication technologys is just carried out in various fields to satisfy such demand.

Need side by side to launch multiple-input and multiple-output (MIMO) technology of many spatial flows (spatial stream) to obtain spectral efficient.The MIMO technology adopts multiple transmit antennas and one or more reception antenna.

The mimo channel that is provided by many antennas can be broken down into a plurality of independently channels.If the number of transmitting antenna is Nt, and the number of reception antenna is Nr, and then independently the number N i of channel is Ni≤min{Nt, Nr}.Independently each in the channel can be called space layer.

Order (rank) is the number of eigenvalue of the non-zero of mimo channel matrix, and it can be defined as can be by the number of multiplexed spatial flow.This order is identical with the number of channel independently.If this order is 1, then a data flow can be launched on a space layer, and if this order be 2, then two independent data stream can side by side be launched on two space layer.If this order is K, the individual independently stream of K that then has different rates can be launched on each space layer.

For 4 * 4MIMO system, maximum can be four orders (four MIMO layers).But the transmission of maximum order is not used in expectation always.Mimo channel can limit the order that is used to transmit.Though being transmitted in the speed aspect, high order is better than the low-rank transmission, for the channel condition expectation low-rank transmission of difference.

In order to obtain to be used for the gain of a plurality of antennas, need a kind of relevant de-tuned downlink transmission scheme mimo system of feedback of channel that utilizes subscriber equipment of design.For this purpose, need the subscriber equipment feedback channel information.

If the subscriber equipment report is used for the channel information of each resource module, then can obtain best flexibility.Yet,, can cause high signaling consumption if report is used for the channel information of each resource module.

Need a kind of can being reduced in the mimo system because the method for the signaling consumption that channel information causes.

Summary of the invention

Technical problem

The purpose of this invention is to provide a kind of being used in multiaerial system reporting channel information to reduce the method for signaling consumption.

Technical solution

In one aspect, provide a kind of method of in multiaerial system, reporting downlink channel information to the base station.This method comprises that report is used for the single order of whole sub-band, and whole sub-band comprises a plurality of sub-bands; And report is used for the CQI of the single order of at least one sub-band.

In one aspect of the method, provide a kind of method of in multiaerial system, reporting downlink channel information to the base station.This method comprises the single order of selecting to be used for whole sub-band, and whole sub-band comprises a plurality of sub-bands; Report single order; And report is used for the CQI of the single order of each sub-band.

In a further aspect, provide a kind of method that is used at the multiaerial system transmitting down link data.This method comprises that reception is used for the single order of whole sub-band, reception is used for the CQI of single order, via the order that the downlink control channel emission uses single order to determine, use sum of ranks CQI to distribute at least one sub-frequency bands, and via the sub-band transmitting down link data that is distributed.

Beneficial effect

Subscriber equipment is selected to be used for the single order of whole sub-band based on specific criterion, and only reports single order.The required radio resource of reporting channel information can be lowered, and signaling consumption can be minimized.

Description of drawings

Fig. 1 illustrates the block diagram of transmitter according to an embodiment of the invention.

Fig. 2 illustrates the block diagram of receiver according to an embodiment of the invention.

Fig. 3 is the view that illustrates based on the resource distribution of the system of OFDMA.

Fig. 4 illustrates the flow chart of the method for reporting channel information according to an embodiment of the invention.

Fig. 5 illustrates the example view of the method for reporting channel information according to an embodiment of the invention.

Embodiment

Technology described below can be used in various communication systems, comprises code division multiple access (CDMA) system, wideband CDMA (WCDMA) system, frequency division multiple access (FDMA) system, Orthodoxy Frequency Division Multiplex (OFDM)/OFDM (OFDMA) system or the like.OFDM is the multi-carrier modulation technology that is used for effectively the whole system bandwidth being divided into a plurality of orthogonal subbands.Sub-band can be called as single-tone (tone), subcarrier, subchannel or the like.

Communication system can be multiple-input and multiple-output (MIMO) system, the single output of perhaps many inputs (MISO) system.Mimo system uses a plurality of transmitting antennas and a plurality of reception antenna.The MISO system uses a plurality of transmitting antennas and single receive antenna.

Base station (being called BS hereinafter) is and the fixed station of communications of user equipment that the base station can be called as another term, such as Node B, base transceiver systems (BTS), access point or the like.This subscriber equipment (being called UE hereinafter) can be fixing or mobile, and can be called as another term, such as mobile radio station (MS), user terminal (UT), subscriber station (SS), wireless device or the like.

The down link meaning is the communication from BS to UE, and the up link meaning is the communication from UE to BS.In down link, transmitter can be the part of BS, and receiver can be the part of UE.In up link, transmitter can be the part of UE, and receiver can be the part of BS.

Fig. 1 illustrates the block diagram of transmitter according to an embodiment of the invention.

With reference to figure 1, transmitter 100 comprises scheduler 110, channel encoder 120-1 to 120-K, mapper 130-1 to 130-K, MIMO processor 140-1 to 140-K and multiplexer 150.This transmitter 100 also comprises the individual transmitting antenna 190-1 to 190-Nt of Nt (Nt＞1).

Scheduler 110 receives data from N user, and exports K data flow will launching simultaneously.Scheduler 110 is selected modulation and encoding schemes (MCS), such as code rate and modulation scheme, and selected MCS is outputed to channel encoder 120-1 to 120-K, mapper 130-1 to 130-K.Scheduler 110 is selected the MIMO scheme, and selected MIMO scheme is outputed to MIMO processor 140-1 to 140-K.

Among the channel encoder 120-1 to 120-K each is with predetermined encoding scheme coding inlet flow, and the formation coded data.Each of mapper 130-1 to 130-K is mapped to data symbol on the signal star chart with data encoded.The modulation scheme of any kind of be can use, m phase shift keying (m-PSK) and m quadrature amplitude modulation (m-QAM) comprised.For example, m-PSK can be two-phase PSK (BPSK), quadrature PSK (QPSK), and perhaps 8-PSK, and m-QAM can be 16-QAM, 64-QAM or 256-QAM.

Each of MIMO processor 140-1 to 140-K according to multiple transmit antennas 190-1 to 190-Nt with MIMO scheme deal with data symbol.For example, MIMO processor 140-1 to 140-K can carry out the precoding based on code book.

Multiplexer 150 is to suitable subcarrier allocation incoming symbol, and the multiplexed incoming symbol that is used for a plurality of users.160 pairs of incoming symbols of OFDM modulator are carried out the OFDM modulation, and the output OFDM symbol.OFDM modulator 160 can be carried out inverse fast Fourier transform (IFFT) to incoming symbol, and inserts a Cyclic Prefix (CP) in addition after carrying out IFFT.This OFDM symbol is by each emission via transmitting antenna 190-1 to 190-Nt.

This transmitter 100 can be with two pattern work.One is single code word pattern, and another is a plurality of code word patterns.In single code word pattern, the signal of launching via mimo channel has identical data rate.In a plurality of code word patterns, encoded independently via the data of mimo channel emission, make transmission signals can have different data rates.

Fig. 2 illustrates the block diagram of receiver according to an embodiment of the invention.

With reference to figure 2, receiver 200 comprises ofdm demodulator 210, removes mapper 240, channel decoder 250 and controller 260.

210 pairs of signals that receive from reception antenna 290-1 to 290-Nr of ofdm demodulator are carried out fast Fourier transform (FFT).Channel estimator 220 is estimated channel, and 230 execution of MIMO preprocessor are corresponding to the reprocessing of MIMO processor 140-1 to 140-K.Go mapper 240 that incoming symbol is gone to be mapped as coded data, and channel decoder 250 decoding data encoded and recovery initial data.This controller 260 is created suitable feedback information, and via estimated channel or the like the feedback information of being created is fed back to transmitter 100.

Fig. 3 is the view that illustrates based on the resource distribution of the system of OFDMA.

With reference to figure 3, system bandwidth is divided into a plurality of sub-bands.Sub-band is the unit that distributes to the frequency resource of each UE.Sub-band can also be called as Resource Block or subchannel.Each UE can be assigned with at least one sub-band.

The supposing the system bandwidth is divided into 512 subcarriers, that is, the size of FFT is 512.Sub-band comprises 12 subcarriers, and the sum of sub-band is 25 (L=25).The protection frequency band is provided at the two ends of system bandwidth.

BS should know downlink channel information, and (K＜N), K and N are integers here to select K UE from N UE.BS uses from the channel information of UE report and distributes at least one sub-frequency bands to the user.Downlink channel information can comprise channel quality indication (CQI), sum of ranks pre-coding matrix index (PMI).Based on this channel information, BS based on suitable criterion to each UE radio resource allocated.

Because can distribute to the minimum emission unit of each UE is sub-band, thus all channel informations need with consistent calculating of this sub-band and emission.If the number of UE is very little in a sector or sub-district, then can give UE with a plurality of subband allocation.

If the M sub-frequency bands is distributed to UE, then BS should notify information and the selected MCS and the MIMO scheme of the relevant resource allocation of UE via downlink channel.When selecting the L sub-frequency bands to be used for UE, BS should be used for the information of L selected sub-band to the UE emission on downlink control channel.This causes the heavy traffic load of downlink control signal.

Appropriate MCS can be different in each sub-band with order.Iff the MCS difference, and the M sub-frequency bands distributed to UE, then the average CQI of M sub-frequency bands can be as mathematics calculating shown in Figure 1.

[mathematics figure .1]

$\mathrm{CQI}=\exp \left(\frac{1}{M}\underset{i=1}{\overset{M}{\mathrm{\Σ}}}\log (1+{\mathrm{CQI}}_i)\right)$

Here CQI _iBe the CQI of i sub-frequency bands.

When the order of each sub-band when being different, use above formula can't calculate average CQI.If UE launches the CQI that is used for each order as feedback information, then BS can be via best order emission data.Yet, increased feedback information volume.

Fig. 4 illustrates the flow chart of reporting channel information approach according to an embodiment of the invention.

With reference to figure 4, the Signal Interference and Noise Ratio (SINR) that calculates the sub-band be used for each order (S220).

Be identified for the single order (S230) of whole sub-band based on specific criterion.

UE selects to be used for the single order of whole sub-band based on specific criterion, and reports the CQI of single sum of ranks corresponding to single order (S230).If use the precoding based on code book, then UE can report PMI with single sum of ranks CQI.

UE can be by only reducing feedback overhead to the selected single order that is used for whole sub-band of BS report.BS receives the CQI of this single sum of ranks corresponding to this single order.And BS distributes at least one sub-frequency bands to be used for down link data to UE.

UE can calculate the tolerance that is used for each order, so that determine single order.This tolerance can be used and be used for the SINR that each sub-band and each order calculate and calculate.

In one embodiment, the throughput of each order or capacity are calculated as the tolerance that is used for determining single order.Order with maximum value is selected as single order.

Under the situation of single code word pattern, single order can be determined as mathematics is shown in Figure 2.

[mathematics figure .2]

max _r(max _b(f(SINR _r，b)))

Wherein b is the index of sub-band, and r is the index of order, and SINR _{R, b}Be the SINR of r sum of ranks b sub-frequency bands.F () is the function of SINR, expression capacity or throughput, and its value becomes tolerance.

By comparing with the value of the tolerance that is used for each order, the order with peaked tolerance is selected as single order.

For example, suppose to exist system with eight sub-frequency bands and two orders (that is, order 1 and order 2).Measure as shown in table 1.

Table 1

	Order 1	Order 2
			Sub-band 1	1.0	1.8
Sub-band 2	1.2	2.4
			Sub-band 3	0.4	1.3
Sub-band 4	1.1	0.8
			Sub-band 5	2.5	1.4
Sub-band 6	1.8	1.3
			Sub-band 7	0.9	0.7
Sub-band 8	0.6	1.0

The value of the maximum of the tolerance of order 1 is 2.5 of a sub-band 5, and the value of the maximum of the tolerance of order 2 is 2.4 of sub-bands 2.Therefore, single order is confirmed as order 1, and feedback corresponding C QI, code book index or PMI.

Under the situation of a plurality of code word patterns, single order can be determined as mathematics is shown in Figure 3.

[mathematics figure .3]

${\max }_r\left({\max }_b\left(\underset{i=1}{\overset{\mathrm{Cr}}{\mathrm{\Σ}}}f\left({\mathrm{SINR}}_{r,b,i}\right)\right)\right)$

C wherein _rBe the number of the code word of order r, and SINR _{R, b, i}Be the SINR of r order, b sub-frequency bands and i code word.By relatively being used for the C of each order _rThe summation of individual tolerance, the order that will have maximum summation is chosen as single order.

For example, suppose to exist system with eight sub-frequency bands and two orders (that is, order 1 and order 2).Measure as shown in table 2.

Table 2

The C of order 1 ₁Be 1, and the C of order 2 ₂Be 2.The summation of the maximum of the tolerance of order 1 is 2.5 of a sub-band 5, and the summation of the maximum of the tolerance of order 2 is 2.4 of sub-bands 2.Therefore, single order is confirmed as order 1, and feedback corresponding C QI, code book index or PMI.

In another embodiment, the throughput summation (perhaps capacity summation) that is used for the sub-band with the best throughput (perhaps capacity) of J of each order is calculated as the criterion that is used for determining single order.Order with maximum throughput summation (perhaps capacity summation) can be selected as single order.J is the number that depends on sub-band, feedback method, MIMO scheme or the like and the parameter determined.J can be the value that before had been stored in the memory of UE.Perhaps, J can be before for known to BS and the UE, perhaps can be transmitted to the value of UE by BS.

Under the situation of single code word pattern, single order can be determined as mathematics is shown in Figure 4.

[mathematics figure .4]

${\max }_r\left(\underset{b=1}{\overset{J}{\mathrm{\Σ}}}\mathrm{order}\left(f\left({\mathrm{SINR}}_{r,b}\right)\right)\right)$

Wherein order () is the function that is used for the series classification intrinsic value that successively decreases.

Calculating is used for the tolerance of each order, and being used for the tolerance of each sub-band with the series classification that successively decreases, and the best J sub-frequency bands of each order is summed.By comparing with the tolerance summation of each order, the order with maximum metric summation is selected as single order.

For example, suppose to exist system with eight sub-frequency bands and two orders (that is, order 1 and order 2).Measure as shown in table 3.

Table 3

	Order 1	Order 2
			Sub-band 1	1.0	1.8
Sub-band 2	1.2	2.4
			Sub-band 3	0.4	1.3
Sub-band 4	1.1	0.8
			Sub-band 5	2.5	1.4
Sub-band 6	1.8	1.3
			Sub-band 7	0.9	0.7
Sub-band 8	0.6	1.0

Suppose that J is four.In table 3, the tolerance summation of four tolerance of the best of order 1 (sub-band 2,4,5 and 6) is 6.6, and the tolerance summation of four tolerance of the best of order 2 (sub-band 1,2,3 and 5) is 6.9.Therefore, single order is confirmed as order 2, and feedback corresponding C QI, code book index or PMI.

Under the situation of a plurality of code word patterns, single order can be determined as mathematics is shown in Figure 5.

[mathematics figure .5]

${\max }_r\left(\underset{b=1}{\overset{J}{\mathrm{\Σ}}}\mathrm{order}\left(\underset{i=1}{\overset{\mathrm{Cr}}{\mathrm{\Σ}}}f\left({\mathrm{SINR}}_{r,b,i}\right)\right)\right)$

C wherein _rIt is the number of the code word of order r.

Calculating is used for the C of each sub-band of each order _rThe summation of individual tolerance, and in each sub-band with successively decrease the order with its classification.Best J tolerance summation of each order is summed.By comparing with the tolerance summation of each order, the order with maximum metric summation is selected as single order.

For example, suppose to exist system with eight sub-frequency bands and two orders (that is, order 1 and order 2).Measure as shown in table 4.

Table 4

The C of order 1 ₁Be 1, and the C of order 2 ₂Be 2.Suppose that J is four.In table 4, the summation of four tolerance (sub-band 2,4,5 and 6) of the maximum of order 1 is 6.6, and the summation of four tolerance (sub-band 1,2,3 and 5) of the maximum of order 2 is 6.9.Therefore, single order is confirmed as order 2.

Even at all CQI of each sub-band of feedback, feed back the CQI of some sub-bands, use under the situation of discrete cosine transform (DCT) or the like feedback CQI, also can be identified for the single order of whole sub-band.The UE acquisition is used for the CQI of each sub-band of single order, and reports single sum of ranks CQI to BS.UE can report CQI that is used for each sub-band or the CQI that is used for some sub-bands.When the number of whole sub-band was 12, UE obtained to be used for each CQI of 12 sub-frequency bands, and can report 12 CQI.Alternatively, UE can select three sub-frequency bands with best CQI from 12 sub-frequency bands, and reports this three CQI.For other nine sub-frequency bands, can report the average CQI of this nine sub-frequency bands.

Hereinafter, described a kind of when having reported at the L sub-frequency bands (CQI of best M sub-frequency bands among the M＜L), and when having reported the average CQI that is used for other sub-band, determine the method for single order.Value M is previous BS and the known value of UE, perhaps can be transmitted to the value of UE by BS.

Be calculated as the criterion that is used for determining single order when the throughput (perhaps capacity) of each order, and when the order with maximum value is selected as single order, this order can use mathematic(al) representation 2 to determine with single code word pattern, perhaps uses mathematic(al) representation 3 to determine with a plurality of code word patterns.

When the summation of the J of each order throughput (perhaps capacity) is reserved as the criterion of determining single order, if M is greater than J, then single order can be used mathematic(al) representation 4 and use mathematic(al) representation 5 to determine with a plurality of code word patterns with single code word pattern.

If M is less than J, then single order can be shown in Figure 6 definite with single code word pattern such as mathematics.

[mathematics figure .6]

${\max }_r\left(\underset{b=1}{\overset{M}{\mathrm{\Σ}}}\mathrm{order}\left(f\left({\mathrm{SINR}}_{r,b}\right)\right)\right)$

For example, suppose to exist system with eight sub-frequency bands and two orders (that is, order 1 and order 2).Measure as shown in table 5.

Table 5

	Order 1	Order 2
			Sub-band 1	1.0	1.8
Sub-band 2	1.2	2.4
			Sub-band 3	0.4	1.3
Sub-band 4	1.1	0.8
			Sub-band 5	2.5	1.4
Sub-band 6	1.8	1.3
			Sub-band 7	0.9	0.7
Sub-band 8	0.6	1.0

Suppose that J is four, and M is two.Because M is less than J, the summation of M tolerance determines so this order is based on.That is to say that the summation of two best quantitive measure (sub-band 5 and 6) of order 1 is 4.3, and the summation of two best quantitive measure (sub-band 1 and 2) of order 2 is 4.2.Therefore, single order is confirmed as order 1.

If M is less than J, then single order can be shown in Figure 7 definite with a plurality of code word patterns such as mathematics.

[mathematics figure .7]

${\max }_r\left(\underset{b=1}{\overset{M}{\mathrm{\Σ}}}\mathrm{order}\left(\underset{i=1}{\overset{\mathrm{Cr}}{\mathrm{\Σ}}}f\left({\mathrm{SINR}}_{r,b,i}\right)\right)\right)$

For example, suppose to exist system with eight sub-frequency bands and two orders (that is, order 1 and order 2).Measure as shown in table 6.

Table 6

Suppose that J is four, and M is two.Because M is less than J, the summation of M tolerance determines so single order is based on.The summation of the tolerance of two maximums of order 1 is 4.3, and the summation of the tolerance of two maximums of order 2 is 4.2.Therefore, single order is confirmed as order 2.

The advantage of the method that specific example advised to illustrate is described hereinafter.

Suppose that this pattern is a plurality of code word patterns, and the C of order 1 ₁Be one, and the C of order 2 ₂Be two.According to the MIMO scheme, cyclic delay diversity (CDD) is used for order 1, and general CDD is used for order 2.The Interference Cancellation (SIC) of receiver use order is as the reception technique of order 2.Can suppose that also the FFT size is that 512, one sub-frequency bands comprise 36 subcarriers and 10 OFDM symbols, and amount to existence eight sub-frequency bands.10 UE are in the sector, and are dispatched by the direct ratio fair algorithm (proportional fair algorithm) of routine.

The CQI that supposes to be used for an order of each sub-band is fed.The order of each sub-band can be different.

＜first example 〉

One sub-frequency bands is distributed to UE, and sum of ranks of UE feedback is used for the corresponding C QI of each sub-band.The relevant information (MCS, MIMO scheme or the like) of distributing to the resource of each sub-band of BS notice UE.

The CQI that is used for each order that is measured by UE is (unit is a decibel) shown in the table 7.

Table 7

If capacity f (SINR)=log (1+CQI) is used as criterion, then use the tolerance of measuring that CQI calculated shown in the table 8.

Table 8

Under the situation of sub-band 1,2,3 or 8, because the summation of the tolerance of order 2 is greater than the tolerance of order 1, so order 2 is selected.Under the situation of sub-band 4,5,6 or 7, because the summation of the tolerance of order 2 is less than the tolerance of order 1, so order 1 is selected.Because feedback information is the order information and the corresponding C QI of each sub-band, so the UE feedback channel information is as shown in table 9.

Table 9

＜the second example 〉

Give UE with a plurality of subband allocation, and UE feeds back the sum of ranks corresponding C QI of each sub-band.The relevant information (MCS, MIMO scheme or the like) of distributing to the resource of each sub-band of BS notice UE.

For clear, use the CQI and the tolerance of table 7 and 8.Each UE feeds back at the feedback information shown in the table 10.

Table 10

The something in common of this example and first example is that UE reports all channel informations of each sub-band.Yet their difference is only a sub-frequency bands to be distributed to UE in first example, and gives UE with a plurality of subband allocation in this example.Therefore, than first example, reduced down link control information.

＜the three example 〉

Give UE with a plurality of subband allocation, and this UE selects as the single order with peaked order of this tolerance.

For clear, use the CQI and the tolerance of table 7 and 8.Will be from sub-band 1 to sub-band the tolerance of 8 order 1 compare with the summation of the tolerance of order 2, the tolerance 3.6 of sub-band 5 is maximum (with reference to mathematic(al) representations 3).Therefore, order 1 is selected as single order.The corresponding C QI of each sub-band is fed.Table 11 shows the channel information of being reported.

Table 11

Order information=order 1

	CQI
		Sub-band 1	2.35
Sub-band 2	3.66
		Sub-band 3	-3.08
Sub-band 4	3.02
		Sub-band 5	10.49
Sub-band 6	7.03
		Sub-band 7	1.64
Sub-band 8	-0.85

The CQI value can be launched by former state, perhaps can be launched with the value that is different from previous value.

This UE reports that single sum of ranks is used for the CQI of the sub-band of single order.Than first example and second example, reduced the amount of the radio resource that is used for send channel information.

＜the four example 〉

Give UE with a plurality of subband allocation, and this UE selects single order based on the summation of J best sub-band.

For clear, use the CQI and the tolerance of table 7 and 8.Suppose that J is four.The best sub-band of order 1 is the order according to sub-band 5,6,2 and 4, and the summation of its tolerance is 9.6.The best sub-band of order 2 is the orders according to sub-band 2,1,5 and 3, and the summation of its tolerance is 9.8.Therefore, order 2 is selected as single order (with reference to mathematic(al) representation 5), and feeds back the corresponding C QI of each sub-band.Table 12 shows feedback information.

Table 12

Order information=order 2

This UE is based on the summation of J best sub-band and select single order, and reports the CQI of single order.Give each UE with a plurality of subband allocation.Than first example and second example, reduced the amount of the radio resource that is used for send channel information.

Table 13 shows the spectrum efficiency of above-mentioned example.

Table 13

	First example	Second example	The 3rd example	The 4th example
					Spectrum efficiency (bps/Hz/ sector)	1.78	2.03	1.91	1.93

Have about 6% difference at aspect of performance though the 3rd and the 4th example are compared with second example, in the 3rd and the 4th example, the amount of the channel information of being reported is very little.The amount of information of relevant resource allocation by BS notice UE is also very little.In first and second example, the channel information amount of being reported approximately is (number of sub-band) * log ₂(# of available order) position, and in the 3rd and the 4th example, approximately be 1 * log ₂(# of available order) position.

Therefore, be used for the CQI of single order, performance degradation can not occur though UE reports single sum of ranks.Signaling consumption can be minimized.

Fig. 5 illustrates the example view of the method for reporting channel information according to an embodiment of the invention.

With reference to figure 5, system bandwidth is divided into a plurality of basebands.Baseband has the bandwidth narrower than system bandwidth, and comprises a plurality of sub-bands.When only being identified for the single order of system bandwidth, if system bandwidth is very big, then efficient can be lowered.For example, in system, only can select single order with 5MHz or littler bandwidth.(that is, 10MHz, 15MHz, 20MHz or the like in) the system, system bandwidth can be divided into a plurality of basebands, and can be identified for each the single order in the baseband having 5MHz or bigger bandwidth.

The size that depends on system bandwidth, the number of baseband can be different.The size of baseband can be identical, perhaps can be different.

UE selects to be used for each single order of baseband, and feedback is corresponding to the CQI of selected single order.BS is to UE transmission resources assignment information.BS can be via L1/L2 control signal transmission resources assignment information only.

In addition, BS can distribute the sub-band with identical single order to UE.For example, suppose that baseband #1 is confirmed as order 1, baseband #2 is confirmed as order 1, and baseband #3 is confirmed as order 2.BS can distribute baseband #1 and the #2 with identical order to UE.

Fig. 6 is the diagram flow chart that is used to launch the method for data according to an embodiment of the invention.

With reference to figure 6, UE is identified for the single order of whole sub-band, and emission comprises that single sum of ranks is used for the channel information (S310) of CQI of each sub-band of single order.Report is used for the CQI of each sub-band, and report only is used for the single order of whole sub-band.Therefore, can reduce the signaling consumption that causes owing to reporting channel information.

The radio resource information (S320) of UE is distributed in the BS emission.Radio resource information can be launched via downlink control channel, such as L1/L2 control channel, Dedicated Control Channel or the like.Radio resource information comprises employed order of down link data and the sub-band information of being distributed.BS can use single order to be identified for the order of transmitting down link data, and via the determined order of downlink control channel notice UE.Alternatively, BS can determine this order by ignoring single order.

BS via the sub-band that is distributed to UE transmitting down link data (S330).

The step of the method for describing in conjunction with the embodiment disclosed herein can make up by hardware, software or its and realize.Hardware can be by being designed to carry out above function application-specific integrated circuit (ASIC) (ASIC), Digital Signal Processing (DSP), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microprocessor, other electronic unit or its make up and realize.The module that is used to carry out above function can realize software.Software can be stored in the memory cell, and is carried out by processor.Memory cell or processor can adopt and well known to a person skilled in the art various devices.

Because can be under the situation that does not deviate from spirit of the present invention or intrinsic propesties with the present invention of some form imbodies, so should also be appreciated that, the foregoing description is not subjected to the restriction of any above-described details, except as otherwise noted, but should broadly be interpreted as its spirit and scope of limiting of appended claim within.Therefore, appended claim is intended to comprise all variations and the modification in the equivalent on the border of dropping on this claim or such border.

Claims (10)

1. One kind in multiaerial system to the method for base station report downlink channel information, described method comprises:

   Report is used for the single order of whole sub-band, and described whole sub-band comprises a plurality of sub-bands; And

   Report is used for the CQI of the described single order of at least one sub-band.
2. 2. according to the process of claim 1 wherein that report is used for the CQI of selected sub-band select at least one sub-band from described a plurality of sub-bands after.
3. 3. according to the method for claim 2, further comprise:

   Report is used for the average CQI of other sub-band.
4. 4. according to the method for claim 1, further comprise:

   Receive the order that is used for down link data from described base station via downlink control channel.
5. One kind in multiaerial system to the method for base station report downlink channel information, described method comprises:

   Selection is used for the single order of whole sub-band, and described whole sub-band comprises a plurality of sub-bands;

   Report described single order; And

   Report is used for the CQI of the described single order of each sub-band.
6. 6. according to the method for claim 5, wherein select described single order to comprise:

   Calculating is used for the Signal Interference and Noise Ratio (SINR) of each sub-band;

   Use described SINR to calculate the tolerance that is used for each order; And

   Selection has the affiliated single order of sub-band of maximum tolerance.
7. 7. according to the method for claim 6, its vacuum metrics is the throughput of each order.
8. 8. according to the method for claim 6, its vacuum metrics is the capacity of each order.
9. 9. method that is used at the multiaerial system transmitting down link data, described method comprises:

   Reception is used for the single order of whole sub-band;

   Reception is used for the CQI of described single order;

   Use the definite order of described single order via the downlink control channel emission;

   Use the described CQI of described sum of ranks to distribute at least one sub-frequency bands; And

   Launch described down link data via the sub-band that is distributed.
10. 10. according to the method for claim 9, wherein said sub-band comprises 12 subcarriers.

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