CN102415000A - Method for setting precoder in open loop mimo system - Google Patents

Abstract

A feedback method of a user equipment in an open loop Multiple-Input Multiple-Output (MIMO) system is disclosed. The method includes, receiving one of a plurality of modes determined according to types of resources to be used for performing feedback from a base station, and selecting a precoding matrix from a codebook subset corresponding to the received mode, applying the selected precoding matrix, and transmitting feedback information. Different codebook subsets are configured with respect to the plurality of modes, and the codebook subset is configured by extracting a predetermined number of elements from a base codebook based on a predetermined criterion considering the characteristics of the modes.

Description

Be used for setting the method for the precoder of open loop MIMO system

Technical field

The present invention relates to cellular system (cellular system), more properly, relate to a kind of method that in open loop multiple-input and multiple-output (MIMO) system, is used to set precoder.

Background technology

To sketch the applied multiple-input and multiple-output of the present invention (MIMO) technology at first, here.

The MIMO scheme is meant the scheme of using a plurality of transmission antennas and a plurality of reception antennas, so that improve the efficient of data transmission, it is different with the traditional scheme that uses a transmission antenna and a reception antenna.That is, in mimo system,, pass through several antennas but not the collection in use single antenna path and the technology of binding data fragment with using in order to receive a message.According to the MIMO technology, can in particular range, improve data transmission rate, maybe can increase system scope with respect to the particular data transmission rate.That is, the MIMO technology is the next generation mobile communication technology that is used for mobile communication that can be widely used in subscriber equipment (UE), transponder etc.Because this technology can overcome the restriction of the transmission size of the mobile communication that causes owing to data communication expansion, so gazing at of working as of this technological suction phase.

Fig. 1 is the view that shows the configuration of general mimo system.

As shown in Figure 1, if the quantity of transmitter and the quantity of receiver increase simultaneously, the then increase that is directly proportional with the quantity of antenna in theory of Channel Transmission capacity, and only to be used to the situation of a transmitter or receiver different with many antennas wherein.Therefore, frequency efficiency improves significantly.

After in the mid-90 the theoretical capacity increase of mimo system being confirmed, actively study, until today for the various technology that can improve data transmission rate in fact.Wherein, used some technology in 3G (Third Generation) Moblie, and the various wireless communication standards of WLAN of future generation (LAN).

The various researchs that are associated with the MIMO technology, for example in various channel circumstances and a plurality of access environment with information theory that the consumption of MIMO message capacity is associated on research, radio channel measure and the model of mimo system on deriving research and be used to improve transfer rate and the research that improves on the space-time signal processing technology that transmits reliability is being actively pushed forward.

The MIMO technology can be divided into space diversity scheme, and it uses the same-sign through various channel paths to be used for increasing the transmission reliability; And spatial multiplex scheme, it uses a plurality of transmission antennas and is used for transmitting simultaneously a plurality of different pieces of information symbols, so that improve transfer rate.In addition, a kind of these schemes of abundant combination have been carried out recently so that obtain the method for advantage separately.

Generally speaking, in the MIMO pattern that in system, allows,, be sole user MIMO (SU-MIMO) pattern with the MIMO mode division so depend on space resources how to be assigned with because added space resources, and multiuser MIMO (MU-MIMO) pattern.

Fig. 2 is the view of structure that shows the downlink mimo system of transmitter.As shown in Figure 2, MIMO encoder 201 maps to M with the individual layer of L (>=1) _tThe individual stream of (>=L).This stream is input to precoder 202.Through coding, and the modulation path that inputs to MIMO encoder 201 comes definition layer.In addition, stream is defined by the output of MIMO encoder 201 through precoder 202.

Precoder 202 produces the specific data symbol of antenna according to selected MIMO pattern, so that stream is mapped to antenna.

Subcarrier mapper 203 data map that antenna is specific is to the OFDM symbol.

Come the mapping of execution level through MIMO encoder 201 to stream.MIMO encoder 201 is batch processor of handling M incoming symbol simultaneously.Input to MIMO encoder 201 can be through representing like M * 1 vector that is shown in the equality 1.

Equality 1

$s=\left[\begin{array}{c}{s}_1\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ s_M\end{array}\right]$

In equality 1, S _iI the incoming symbol of representative in a batch processing.The layer of incoming symbol to being mapped in the spatial domain of stream carried out.

At first, the output of MIMO encoder 201 can be by the M that is shown in the equality 2 _t* N _FMIMO space time coding (STC) matrix and represent.

Equality 2

x＝S(s)

At this moment, M _tThe quantity of representative stream, and N _FRepresentative is by the quantity of the occupied subcarrier of MIMO block.X represents the output of MIMO encoder 201, and S represents the input layer vector, and S (s) represents the STC matrix.

In addition, x representes through the matrix that is shown in the equality 3.

Equality 3

In SU-MIMO transmitted, STC led by equality 4 definition.

Equality 4

$R=\frac{M}{N_F}$

In MU-MIMO transmitted, it was 1 that the STC of each layer leads.

As the form of MIMO encoder 210, but usage space frequency zones block code (SFBC) is encoded, vertical coding (VE) and level code (HE).

In the SFBC coding, can be to the input of MIMO encoder 201 by 2 * 1 vector representations that shown in the equality 5.

Equality 5

$s=\left[\begin{array}{c}{s}_1\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\end{array}\right]$

MIMO encoder 201 produces and is shown in the SFBC matrix in the equality 6.

Equality 6

$x=\left[\begin{array}{cc}{s}_1& -{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_2^{*}\\ s_2& {\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_1^{*}\end{array}\right]$

At this moment, x represents 2 * 2 matrixes, and SFBC matrix x occupies two continuous subcarriers.

In VE, the input of MIMO encoder 201 and output are represented through M * 1 vector that is shown in the equality 7.

Equality 7

$x=s=\left[\begin{array}{c}{s}_1\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ s_M\end{array}\right]$

At this moment, s _iI the incoming symbol of representative in a batch processing, and S ₁... S _MBelong to identical layer with respect to VE.

In HE, the input of MIMO encoder 201 and output are represented through M * 1 vector that is shown in the equality 8.

Equality 8

$x=s=\left[\begin{array}{c}{s}_1\\ {\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">s</figure-callout>}}_2\\ \&CenterDot;\\ \&CenterDot;\\ \&CenterDot;\\ s_M\end{array}\right]$

At this moment, s _iI the incoming symbol of representative in a batch processing, and S ₁... S _MBelong to different layers with respect to HE.

To be described in detail a kind of method that stream is mapped to antenna now.

The mapping that flow to antenna is carried out through precoder 202.N is multiply by in the output of MIMO encoder 201 _t* M _tThe w of precoder.N is passed through in the output of precoder _t* N _FMatrix z and representing.The method that stream is mapped to antenna is by equality 9 expressions.

Equality 9

At this moment, N _tRepresentative transmits the quantity of antenna, and z _{J, k}Representative is on the k number of sub-carrier, through j the output symbol that physical antenna transmitted.

Applicable method for precoding comprises the non-self-adapting method for precoding, and the adaptive pre-encoding method.

In the non-self-adapting method for precoding, pre-coding matrix is N _t* M _tMatrix W (k).At this moment, N _tRepresentative transmits quantity, the M of antenna _tThe physics index that the quantity of representative stream and k represent the applied subcarrier of W (k).Matrix W is selected from the subclass of precoder, and it has Basic codebook size N for given order _wAccording to equality 10, matrix W is at N ₁P _SCThe interval of continuous physical subcarrier changes, and matrix W does not rely on the quantity of subframe.Be applied to the N of subcarrier k _t* M _tPre-coding matrix W (k) is from order M _tThe open loop codebook subset in select, with code word as index i.At this moment, i is given by equality 10.

Equality 10

In the open loop zone, matrix W is in N ₁P _SCThe interval of continuous physical subcarrier is changed.The default value of N is to be N ₁N ₂Be optional, and N ₂Use do not need extra signalling.

Otherwise, in the adaptive pre-encoding method, from the feedback of UE, obtain matrix.

Precoding (code book feedback) based on code book comprises three feedback models, that is, and and fundamental mode, adaptive model, and differential mode.

In the precoding based on sound of time division duplex (TDD), the value of matrix W obtains from the sound feedback of UE.Can present several downlink mimo patterns, and it is shown in the table 1.

Table 1

Mode index	Describe	Reference
			Pattern
0	OL SU-MIMO (SFBC) with non-self-adapting precoder
			Pattern
1	OL SU-MIMO (SM) with non-self-adapting precoder
			Pattern
2	CL SU-MIMO (SM) with adaptive pre-encoding device
			Mode
3	OL SU-MIMO (SM) with non-self-adapting precoder
			Pattern
4	CL SU-MIMO (SM) with adaptive pre-encoding device
			Pattern 5-7	n/a	N/a

In SU-MIMO, a Resource Unit (RU) is assigned to a user, and a forward error recovery (FEC) block is presented in (this is corresponding with the vertical MIMO coding in the transmitter) in the input of MIMO encoder 210.In vertical MIMO coding, produce from a user information bit through all data flow that several antennas transmitted, so that through identical FEC block.

Simultaneously, in MU-MIMO, a RU can be assigned to a plurality of users, and a plurality of FEC block is presented in (this is corresponding with horizontal MIMO coding) in the input of MIMO encoder 201.In horizontal MIMO coding, produce from different information bits through the distinct symbols that several antennas transmitted, so that through different FEC blocks and modulation block.

Generally speaking, if number of users is few, then the SU-MIMO performance is good, and if number of users is huge, then the MU-MIMO performance is good.Among SU-MIMO and the MU-MIMO each is divided into closed-loop MIMO (CL-MIMO) and open loop MIMO (OL-MIMO).Although the MIMO technology based on the CL-MIMO technology in the channel of between UE and base station, being set up the relevant information of state and be employed; When in the OL-MIMO technology; Exist cause because of high speed motion for the restriction of feedback information reliability the time, the using MIMO technique for the purpose of diversity gain.

The sub-channelizing of IEEE 802.16m comprises two patterns.The firstth, hubbed mode wherein generally uses sub-band continuous resource unit (CRU); And the two be diversity mode, wherein generally use distributed resource unit (DRU).Mini frequency band CRU can be used among both of this locality and diversity mode.

Though sub-channelizing comprises several patterns, traditionally, use pre-coding matrix W, and pattern is not distinguished.Pre-coding matrix uses general pre-coding matrix because reckon without the characteristic of the resource of distributing, so may not be optimized for each pattern according to pattern.

Summary of the invention

Technical problem

The object of the invention that is designed to deal with problems depends on the application according to the optimization pre-coding matrix of the kind of Resources allocation.

Technical solution

Through in open loop multiple-input and multiple-output (MIMO) system, providing the feedback method of subscriber equipment can realize the object of the invention, said feedback method comprises: receive from the base station according to the type of the resource that will be used to carry out feedback and definite a plurality of patterns one; And from the corresponding codebook subset of the pattern that is received the pre-coding matrix selected; Use selected pre-coding matrix; And the transmission feedback information, wherein, different codebook subsets disposes with respect to these a plurality of patterns; And this codebook subset is through the predetermined criterion based on the characteristic of considering pattern, from Basic codebook, extracts the element of predetermined quantity and disposes.

In another aspect of this invention; Provide a kind of in open loop multiple-input and multiple-output (MIMO) system the method to the user equipment allocation resource, it comprises: at base station place to the notification of user equipment indication when this subscriber equipment transmits feedback information with one in a plurality of patterns of the type of the resource of use; Receiving feedback information, wherein, will from the corresponding codebook subset of the pattern of being notified the pre-coding matrix selected be applied to said feedback information; And use the feedback information that is received with resource allocation to subscriber equipment; Wherein, Different codebook subsets disposes with respect to a plurality of patterns, and codebook subset is through the predetermined criterion based on the characteristic of considering pattern, from Basic codebook, extracts the element of predetermined quantity and disposes.

In another aspect of this invention; A kind of subscriber equipment that in open loop multiple-input and multiple-output (MIMO) system, is used to transmit feedback information is provided; Said subscriber equipment comprises: receiving element, and it is configured to receive from the base station according to the type of the resource that will be used to carry out feedback and one notice definite a plurality of patterns; Processing unit, its be configured to from the corresponding codebook subset of the pattern of being notified select pre-coding matrix, use selected pre-coding matrix, and produce this feedback information; And delivery unit; It is configured to transmit the feedback information that is produced; Wherein, receiving element, processing unit, and delivery unit be electrically connected, different codebook subsets dispose with respect to a plurality of patterns; And codebook subset is through the predetermined criterion based on the characteristic of considering pattern, from Basic codebook, extracts the element of predetermined quantity and disposes.

A plurality of patterns can comprise hubbed mode and diversity mode, and when in hubbed mode, transmitting, sub-band continuous resource unit (CRU) can be used as the logical resource unit; And when in diversity mode, transmitting, distributed resource unit (DRU) can be used as the logical resource unit.

Can dispose through from Basic codebook, extracting element predetermined quantity, that satisfy the constant modulus characteristic with the corresponding codebook subset of this hubbed mode.

Can dispose through from Basic codebook, extracting element predetermined quantity, that be used to maximize the string distance with the corresponding code book of this diversity mode.

Beneficial effect

According to the present invention, systematic function can be through improving according to the optimization precoder through the type of the resource of distributing.

Description of drawings

Comprised being used to provide the appended accompanying drawing of further understanding of the present invention to show embodiments of the invention, and it is used to explain principle of the present invention with specification.

In the accompanying drawings:

Fig. 1 is the view that shows the configuration of general multiple-input and multiple-output (MIMO) system;

Fig. 2 is the view that is presented at the structure of downlink mimo in the transmitter;

Fig. 3 shows the view that physical resource unit (PRU) is mapped to the processing of logical resource unit (LRU);

Fig. 4 illustrates the flow chart of method of allocating resources in down link according to an embodiment of the invention;

Fig. 5 illustrates the flow chart that in up link, transmits the method for data according to an embodiment of the invention; And

Fig. 6 is the block diagram that shows the configuration of the device be applied to base station and subscriber equipment (UE) and can carry out above method.

Embodiment

Now will be in detail with reference to the preferred embodiments of the present invention, its example illustrates in alterations.

Following examples propose through combining constituent components of the present invention and characteristic according to predetermined form.Independent constituent components or characteristic should be considered nonessential factor under the condition of no extra annotations and comments.If need, independent constituent components or characteristic can not combine with other assembly or characteristic.And some constituent components and/or characteristic can be combined the embodiment with embodiment of the present invention.The disclosed operating sequence of embodiments of the invention can be rearranged.Some assembly or the characteristic of any embodiment also can be included in other embodiment, or in being replaced by assembly among other embodiment or characteristic in case of necessity.

In illustrated explanation, make become non-essential fuzzy program or step of category of the present invention to be omitted, and can also will be omitted by program or the step that those skilled in the art understand.

Should be appreciated that disclosed particular term is better understood and proposed for the convenience explained and to the present invention among the present invention, and in technological category of the present invention or spirit, can another form be changed in the use of this particular term.

At first, the resource that explanation is used for mobile radio system.

In mobile radio system, generally speaking, resource is divided into first subregion and second subregion.First subregion is suitable for according to frequency, obtains the branch collection through the resource that is assigned to the actual physics band equably.Second subregion is benefited through the user who arranges the resource continuity to have better relatively channel to according to frequency.

For example actual example, in the situation of IEEE 802.16e, the former provides as part and uses subchannel (PUSC) or use subchannel (FUSC) fully, and the latter is as band-adaptive modulation and encoding scheme (AMC).

Simultaneously, in the situation of IEEE 802.16m, the former divides through distributed resource unit (DRU), and the latter divides through continuous resource unit (CRU), and both can be present in the sub-frame simultaneously for it.Physical resource unit (PRU) is the basic physical location that is used for resource allocation, and logical resource unit (LRU) is basic logic unit.DRU and CRU belong to LRU.DRU comprises group of subcarriers, and it intersperses among during all distributed resource branches in the frequency partition wear.CRU is included in the continuous group of subcarriers in all resource allocation bands.

Fig. 3 is the view that explanation maps to PRU the processing of LRU.

Below, will PRU be mapped to the processing of LRU with reference to Fig. 3 explanation.

Such as Fig. 3 demonstration, at first, PRU is divided into based on the PRU of sub-band and based on the PRU of mini frequency band.In Fig. 3, pass through PRU based on the PRU of sub-band _SBRepresent, and pass through PRU based on the PRU of mini frequency band _MBRepresentative.PRU _SBBe suitable for frequency and select to distribute, because PRU is by continuous being distributed on the frequency axis.In addition, PRU _MBBeing suitable for frequency diversity distributes and is arranged on the frequency axis.

PRU _SBBe mapped to CRU, and PRU _SBThe CRU that is mapped to is defined as the CRU based on sub-band.PRU _MBHandle through arranging (in Fig. 3, through the PRU that arranges _MBBy PPRU _MBExpression) maps to DRU.At this moment, some PPRU _MBBe mapped to CRU, and PPRU _MBThe CRU that is mapped to is defined as the CRU based on mini frequency band.

DRU is suitable for the OL-MIMO pattern in the MIMO pattern, and it can easily obtain diversity gain.CRU based on sub-band is adapted to pass through the CL-MIMO pattern of using channel status and serving.Simultaneously, CL-MIMO pattern or OL-MIMO pattern can be applied to the CRU based on mini frequency band.

In addition, the resource band that actual allocated is given UE is corresponding to based on the CRU of sub-band or any one among the DRU, and is not assigned to UE based on the both of sub-band CRU and DRU.Moving rapidly in the situation of UE,,, resource allocation is benefited to UE so use DRU because channel status changes rapidly.Therefore, in this situation, preferably, use DRU, with resource allocation to UE.Be arranged in the situation of the environment that channel status changes well and slowly at UE, preferably, use CRU, with resource allocation to UE.

In the situation of IEEE 802.16m, sub-channelizing can be divided into hubbed mode and diversity mode.Generally speaking, be assigned with and be used in hubbed mode based on the CRU of sub-band, and DRU is assigned with and is used in diversity mode.In addition, mini frequency band CRU can be used in hubbed mode or the diversity mode.That is, the type of employed resource changes according to hubbed mode and diversity mode.Therefore, according to systematic function, no matter how and to use identical pre-coding matrix be not preferred pattern.

The present invention advises a kind ofly disposing the method for different codebook subsets according to hubbed mode and diversity mode, with optimization of system performance.

For the method for the codebook subset that configuration is optimized according to pattern is described, suppose that (Nt, Mt Nw) represent code book to C, and the Nt representative transmits the quantity of antenna, the quantity of Mt representative stream and the quantity of the code word that Nw represents code book.

When the code book that is used for hubbed mode is C_localized (Nt; Mt; Nw1), channel quality indication (CQI) or modulation and encoding scheme (MCS) rank can be set at hypothesis and transmit use C_localized (Nt, Mt; Nw1) and equality 10 and carrying out, or the hypothesis precoding use above-mentioned code book and carry out.Here, the Nt representative quantity and the Nw1 representative that transmit quantity, the Mt representative stream of antenna is used for representing being included in the figure place of index of the pre-coding matrix of code book.

In order in hubbed mode, to use pre-coding matrix with superperformance; C_localized (the Nt that uses in the hubbed mode; Mt Nw1) can pass through to use the code book identical with the CL-MIMO Basic codebook, or from the CL-MIMO Basic codebook, extract pre-coding matrix according to predetermined criteria and dispose.

At this moment, (Nt, Mt Nw1), as the criterion of from the CL-MIMO code book, extracting pre-coding matrix, for example, can use the criterion of from the element of CL-MIMO Basic codebook, extracting the element that only has the constant modulus characteristic in order to dispose C_localized.

In diversity mode, can (Nt, Mt Nw2) and the hypothesis carried out of equality 10, or the precoding hypothesis of using this method to carry out, set CQI or MCS rank based on transmit using C_diversity.Here, Nw2 representative is used for representing being included in the figure place of index of the pre-coding matrix of code book.Nw1 and Nw2 can differ from one another.

(Nt M) is N as hypothesis u _t* M unit matrix, and W1 and W2 be u (when Nt, M) element, can such as in the equality 11 demonstration ground definition string apart from (chord distance).

Equality 11

$d({\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HDA0000103162450000021.png"\; state="\{\{state\}\}">W</figure-callout>}}_1,W_2)=\frac{1}{\sqrt{2}}{\left|\right|W_1{W}_1^H-W_2{W}_2^H\left|\right|}_F$

As select to be used for disposing the code book C_diversity that is used in diversity mode (Nt, Mt, a criterion of pre-coding matrix Nw2), the matrix that is used to maximize the string distance can be selected the code book from CL-MIMO.Because the operation that the matrix in the present code book is successful with respect to various channels is indicated in the maximization of string distance, it can be used the criterion that disposes the pre-coding matrix of the code book that is used for diversity mode as selection.

Below, with explanation a kind of the quantity that transmits antenna be 4 and order be under 2 the situation, from Basic codebook, extract pre-coding matrix so that according to the method for pattern configurations codebook subset.

Table 2 shows basic CL-MIMO code book, is used for disposing codebook subset according to diversity mode and hubbed mode.

Table 2

In the basic CL-MIMO code book that table 2 showed, satisfy the constant modulus characteristic from the pre-coding matrix of m=0 to m=15.That is, from the pre-coding matrix of m=0 to m=15, because the summation of the output size of the pre-coding matrix of antenna is equated, so satisfy the constant modulus characteristic.Therefore, in hubbed mode, codebook subset can dispose through extracting from the pre-coding matrix of m=0 to m=15.That is, from basic CL-MIMO code book, the configurable codebook subset C_localized (4,2,4) that will be used for hubbed mode.

Simultaneously, in diversity mode, codebook subset can dispose through the pre-coding matrix that extraction is used to maximize the string distance.For example, the precoding subset that is used in the diversity mode can dispose through the pre-coding matrix corresponding to m=23, m=29, m=25 and m=27 that from basic SU-MIMO code book, extracts the condition that satisfies maximization string distance.

Though the basic code based on table 2 provided explanation originally, even when the quantity that transmits antenna and order changes, codebook subset also can use above method to dispose according to pattern.

With the operation of explanation the present invention in up link and down link.

Fig. 4 illustrates the flow chart of method of allocating resources in down link according to an embodiment of the invention.At first, in down link, when feedback request was made to UE in the base station, in UE hubbed mode and the diversity mode was notified in the base station, and it will (step 401) be employed when UE carries out feedback.That is, when the request of feedback information was done to UE in the base station, which kind of pattern base station notice UE it should transmit feedback information (in hubbed mode or the diversity mode) with.With from codebook subset, being selected precoder by the UE of notification mode, use precoder, and transmit feedback information (step 402) corresponding to the pattern of being notified for the request of feedback.Feedback information can be corresponding to being used to set CQI or other information of MCS level.The base station uses feedback information to come Resources allocation to UE (step 403).At this moment, as stated, different codebook subsets can dispose according to pattern, and precoder can be selected from different codebook subsets according to pattern.

Fig. 5 illustrates the flow chart that in up link, transmits the method for data according to an embodiment of the invention.In up link, base station sets when UE transmits data etc. in up link with the pattern of using (hubbed mode or diversity mode), according to this mode initialization CQI or MCS rank, and the pattern (step 501) that sets of notice UE.Can use control information and directly notify UE this pattern, or can notify UE this pattern indirectly according to the sub-channelizing rule.UE selects precoder, uses precoder and up link, transmits data (step 502) from the codebook subset of the pattern of corresponding warp notice.At this moment, as stated, different codebook subsets can dispose according to pattern, and precoder can be selected from different codebook subsets according to pattern.

Fig. 6 is the block diagram that shows the configuration of the device be applied to base station and subscriber equipment (UE) and can carry out above method.Such as Fig. 6 demonstration, device 60 comprises processing unit 61, memory cell 62, radio frequency (RF) unit 63, display unit 64 and user interface section 65.The physical interface protocol layer is provided by processing unit 61.Processing unit 61 provides control plane and user plane.The function of each layer can be carried out by processing unit 61.Memory cell 62 is electrically connected to processing unit 61 and store operation system, application program and generic-document.If device 60 is UE, then display unit 64 can show various information and can use known LCD (LCD), Organic Light Emitting Diode (OLED) or fellow to realize.User interface section 65 can be disposed by the combination of known users interface, and for example keypad and Touch Screen dispose.RF unit 63 is electrically connected to processing unit 61, so that transmit or receive the RF signal.

In other words, it will be readily apparent to one skilled in the art that to be used for the network formed by several network nodes that comprise the base station that the various operations that make the base station to communicate by letter with UE are implemented by the network node beyond base station or the base station.Term " base station " can be replaced by term " fixed station ", " Node B ", " e Node B (eNB) " or " access point " in case of necessity.Term " subscriber equipment " corresponds to mobile radio station (MS) and term " MS " also can be replaced by term " subscriber station (SS) ", " mobile subscriber station (MSS) " or " portable terminal " in case of necessity.

Simultaneously, as UE of the present invention, can use PDA(Personal Digital Assistant), cell phone, personal communication service (PCS) phone, global mobile system (GSM) phone, wideband CDMA (WCDMA) phone or mobile broadband system (MBS) phone.

Embodiments of the invention can be implemented by various means, for example hardware, firmware, software or its combination.

Passing through under the situation of hardware embodiment of the present invention, the present invention can be implemented by application-specific integrated circuit (ASIC) (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, a controller, microcontroller, microprocessor or the like.

If operation of the present invention and function are by firmware or software implementation, the present invention can implement by various forms, for example, and module, program, function or the like.Software code can be stored in the memory cell, so that driven by processor.Memory cell is positioned within the processor or, makes it to communicate by letter through various well-known parts with above-mentioned processor outward.

Pattern of the present invention

To be used to realize that optimization model of the present invention described various embodiment.

Industrial usability

The present invention can be applied to subscriber equipment or the network that is used for the radio access system.

It will be readily apparent to one skilled in the art that and to do various modifications and change in the present invention and do not break away from spirit of the present invention or category.Therefore, desire of the present invention covers modification of the present invention and change, as long as it falls in the scope of accompanying claims and its equivalent.It will be apparent to one skilled in the art that the foregoing description can construct through will not having clearly the claim of adduction relationship, perhaps can also add new claim through the modification after patent application.

Claims (12)

1. the feedback method of the subscriber equipment in open loop multiple-input and multiple-output (MIMO) system, said feedback method comprises:

Receive from the base station according to the type of the resource that will be used to carry out feedback and definite a plurality of patterns one; And

From with the corresponding codebook subset of the pattern that is received select pre-coding matrix, use selected pre-coding matrix, and transmit feedback information,

Wherein, different codebook subsets disposes with respect to said a plurality of patterns, and said codebook subset is through the predetermined criterion based on the characteristic of considering said pattern, from Basic codebook, extracts the element of predetermined quantity and disposes.

2. feedback method according to claim 1, wherein, said a plurality of patterns comprise hubbed mode and diversity mode, when in said hubbed mode, transmitting, sub-band continuous resource unit (CRU) is used as the logical resource unit; And when in said diversity mode, transmitting, distributed resource unit (DRU) is used as the logical resource unit.

3. feedback method according to claim 2 wherein, disposes through from said Basic codebook, extracting element predetermined quantity, that satisfy the constant modulus characteristic with the corresponding codebook subset of said hubbed mode.

4. feedback method according to claim 2 wherein, disposes through from said Basic codebook, extracting element predetermined quantity, that be used to maximize the string distance with the corresponding code book of said diversity mode.

One kind in open loop multiple-input and multiple-output (MIMO) system to the method for user equipment allocation resource, said method comprises:

At base station place to the notification of user equipment indication when said subscriber equipment transmits feedback information with one in a plurality of patterns of the type of the resource of use,

Receive said feedback information, wherein, from the corresponding codebook subset of the pattern of being notified selected pre-coding matrix be applied to said feedback information; And

Use the feedback information that is received, with said resource allocation to said subscriber equipment,

Wherein, different codebook subsets disposes with respect to said a plurality of patterns, and said codebook subset is through the predetermined criterion based on the characteristic of considering said pattern, from Basic codebook, extracts the element of predetermined quantity and disposes.

6. method according to claim 5, wherein, said a plurality of patterns comprise hubbed mode and diversity mode, when in said hubbed mode, transmitting, sub-band continuous resource unit (CRU) is used as the logical resource unit; And when in said diversity mode, transmitting, distributed resource unit (DRU) is used as the logical resource unit.

7. method according to claim 6 wherein, disposes through from said Basic codebook, extracting element predetermined quantity, that satisfy the constant modulus characteristic with the corresponding codebook subset of said hubbed mode.

8. method according to claim 6 wherein, disposes through from said Basic codebook, extracting element predetermined quantity, that be used to maximize the string distance with the corresponding code book of said diversity mode.

9. subscriber equipment that in open loop multiple-input and multiple-output (MIMO) system, is used to transmit feedback information, said subscriber equipment comprises:

Receiving element, said receiving element are configured to receive from the base station according to the type of the resource that will be used to carry out feedback and definite a plurality of patterns one;

Processing unit, said processing unit be configured to from the corresponding codebook subset of the pattern that is received select pre-coding matrix, use selected pre-coding matrix, and produce said feedback information; And

Delivery unit, said delivery unit is configured to transmit the feedback information that is produced,

Wherein, Said receiving element, said processing unit, and said delivery unit be electrically connected; Different codebook subsets dispose with respect to said a plurality of patterns; And said codebook subset is through the predetermined criterion based on the characteristic of considering said pattern, from Basic codebook, extracts the element of predetermined quantity and disposes.

10. subscriber equipment according to claim 9, wherein, said a plurality of patterns comprise hubbed mode and diversity mode, when in said hubbed mode, transmitting, sub-band continuous resource unit (CRU) is used as the logical resource unit; And when in said diversity mode, transmitting, distributed resource unit (DRU) is used as the logical resource unit.

11. subscriber equipment according to claim 10 wherein, disposes through from said Basic codebook, extracting element predetermined quantity, that satisfy the constant modulus characteristic with the corresponding codebook subset of said hubbed mode.

12. subscriber equipment according to claim 10 wherein, disposes through from said Basic codebook, extracting element predetermined quantity, that be used to maximize the string distance with the corresponding code book of said diversity mode.

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