CN101707514B - Generation method of channel quality indicator in LTE system and generation device - Google Patents

Abstract

The invention discloses a generation method of a channel quality indicator CQI in an LTE system. The method is used for generating the CQI corresponding to each code word within a designated band width and comprises the following steps: according to the signal transmission mode from the present network side to a UE side, corresponding to each transmission code word, determining each reference signal position mapped by the transmission code word within the designated band width, calculating an average value of signal to noise ratio SINR of resource units on all determined reference signal positions and taking the calculation result as the SINR of the transmission code word, and according to the SINR of each transmission code word, generating the corresponding CQI serial number of each transmission code word. The application of the method can simply realize the generation of the CQI.

Description

The generation method and apparatus of channel quality indication in a kind of LTE system

Technical field

The present invention relates to the Adaptive Modulation and Coding technology, particularly the generation method and apparatus of channel quality indication in a kind of LTE system.

Background technology

3G (Third Generation) Moblie technology (3G) is progressively commercial in China at present, for further improving communication quality and performance, begins to carry out Long Term Evolution (LTE) Study on Technology.The LTE technology has more technical advantage than 3G, is embodied in: high data rate, grouping transmit, postpone reduction, wide area covering and backward compatible.LTE not only by simplified structure, also adopts following key technology to realize its excellent properties: transmission technology and multiple access technology, grand diversity, modulation and coding, multi-antenna technology.

Adaptive coding modulation also begins to use in LTE simultaneously.In the Adaptive Modulation and Coding technology, measure the channel quality of downlink data in UE user's side, indicate (CQI) according to channel quality value to the base station feedback channel quality, this CQI comprises recommendation transmission block size and the modulation system that UE determines according to current channel quality, thereby realizes the adaptive coding and modulating strategy.

Support two code words in the LTE system at most, corresponding each code word can feed back to the corresponding CQI in base station.At present, though proposed the technology of adaptive coding and modulating, produce the implementation of CQI with regard to how according to channel quality, still do not have ripe solution.

Summary of the invention

In view of this, the invention provides the generation method and apparatus of CQI in a kind of LTE system, can realize producing CQI information according to channel quality.

For achieving the above object, the present invention adopts following technical scheme:

The generation method of CQI in a kind of LTE system is used for being created on that each sends the CQI of code word correspondence in the nominated bandwidth, and this method comprises:

According to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on all reference signal positions of calculate determining, result of calculation is sent the SINR of code word as this;

According to each SINR that sends code word, generate the CQI sequence number that each sends the code word correspondence.

Preferably, when described signalling formula was the single output of single input SISO, described transmission code word had only one;

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all the reference signal positions in nominated bandwidth in each Resource Block.

Preferably, when described signalling formula was transmit diversity among the multiple-input and multiple-output MIMO, described transmission code word had only one;

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all the reference signal positions in each Resource Block in nominated bandwidth on each transmitting antenna and each reception antenna.

Preferably, the SINR that calculates Resource Unit on the described reference signal position is:

${\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l}^n\right)}^H\left(H_{\mathrm{PRB},l}^n\right)\right]}_{t,t}}{{\mathrm{\σ}}^2},$ Wherein, PRB is the sequence number of Resource Block, and n and l are respectively band number and the time domain sequence number of reference signal position, and t is the transmitting antenna sequence number, σ ²Be the noise power in the nominated bandwidth, H is the channel response of Resource Unit on the described reference signal position, [] _{T, t}For getting the capable t column element of t of matrix.

Preferably, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 1, described transmission code word has only one;

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack in nominated bandwidth in each Resource Block.

Preferably, when described signalling formula be spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 2, if described transmission code word has only one, then:

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack and second antenna stack in nominated bandwidth in each Resource Block.

Preferably, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 2, if described transmission code word has two, then send code word for first,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack in nominated bandwidth in each Resource Block;

For second transmission code word,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to second antenna stack in nominated bandwidth in each Resource Block.

Preferably, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 3, described transmission code word has two, sends code word for first,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack in nominated bandwidth in each Resource Block;

For second transmission code word,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to second antenna stack and third antenna layer in nominated bandwidth in each Resource Block.

Preferably, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 4, described transmission code word has two, sends code word for first,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack and second antenna stack in nominated bandwidth in each Resource Block;

For second transmission code word,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to third antenna layer and the 4th antenna stack in nominated bandwidth in each Resource Block.

Preferably, the SINR that calculates Resource Unit on the described reference signal position is:

${\mathrm{SINR}}_{\mathrm{PRB},l,m}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l,m}^n\right)}^H\left(H_{\mathrm{PRB},l,m}^n\right)\right]}_{m,m}}{{\mathrm{\σ}}^2},$ Wherein, PRB is the sequence number of Resource Block, and n and l are respectively band number and the time domain sequence number of reference signal position, and m is the antenna stack sequence number, σ ²Be the noise power in the nominated bandwidth, H is the channel response that is mapped to Resource Unit on the reference signal position of m antenna stack, [] _{M, m}For getting the capable m column element of m of matrix.

The generating apparatus of CQI in a kind of LTE system is used for being created on that each sends the CQI of code word correspondence in the nominated bandwidth, and this device comprises:

The SINR computing unit, be used for according to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on each reference signal position of calculate determining, result of calculation is sent the SINR of code word as this;

The CQI generation unit, each that is used for obtaining according to described SINR computing unit sends the SINR of code word, generates the CQI sequence number that each sends the code word correspondence.

As seen from the above technical solution, among the present invention, a corresponding nominated bandwidth, generate when each sends the CQI of code word correspondence in this bandwidth, at first, according to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on all reference signal positions of calculate determining, the average that calculates is exactly the locational SINR average of the corresponding reference signal of this code word, therefore it can be sent the SINR of code word as this; Then, according to each SINR that sends code word, generate the CQI sequence number that each sends the code word correspondence.By the way, namely can obtain the SINR of each code word simply and easily, then obtain the CQI of each code word correspondence, and this CQI value is to determine according to the SINR that can reflect current channel conditions, therefore, can be in being applied to Adaptive Modulation and Coding, thus effectively guaranteeing can to provide the transfer of data of high-throughput effectively under the prerequisite of systematic function.

Description of drawings

Fig. 1 is the schematic diagram of downlink resource unit in the LTE system.

Fig. 2 is the flow chart of CQI generation method among the present invention.

Reference signal position view when Fig. 3 is 1 antenna port.

First antenna port corresponding reference signal location schematic diagram when Fig. 4 a is 2 antenna ports.

Second antenna port corresponding reference signal location schematic diagram when Fig. 4 b is 2 antenna ports.

First antenna port corresponding reference signal location schematic diagram when Fig. 5 a is 4 antenna ports.

Second antenna port corresponding reference signal location schematic diagram when Fig. 5 b is 4 antenna ports.

The 3rd antenna port corresponding reference signal location schematic diagram when Fig. 5 c is 4 antenna ports.

The 4th antenna port corresponding reference signal location schematic diagram when Fig. 5 d is 4 antenna ports.

Embodiment

For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is described in further details.

Basic thought of the present invention is: calculate the SINR that each sends code word, according to each SINR that sends code word, generate the CQI information that each sends code word again.

Particularly, in the existing CQI of LTE system report, there is the full band of CQI to report (channel response in the shared bandwidth of data is calculated report a full band CQI) and CQI subband to report (the shared bandwidth of data is divided into some subbands, and each subband reports corresponding CQI separately).No matter being to be with to report with subband entirely to report, all is corresponding each transmission code word, reports a CQI under the respective bandwidth.Among the present invention, for differentiation and the application that full band and subband CQI report, identical with existing mode, below describe and also just no longer distinguish subband and full band CQI reporting, the CQI that only describes respective bandwidth reports, and below needs are carried out the respective bandwidth that CQI reports is called nominated bandwidth.That is to say, adopt the channel response of the reference signal in the nominated bandwidth to calculate CQI.

Fig. 1 is downlink resource cell schematics in the LTE system.Wherein, each fritter represents a Resource Unit, Resource Block of expression in the solid black lines of overstriking, and horizontal direction is represented the time domain direction, vertical direction is represented frequency domain direction.

Be the Resource Block sequence number, k is whole frequency domain band number, and l is the time-domain symbol sequence number.Be that frequency domain band number in the Resource Block of PRB is that the frequency band of n and SINR that the time domain sequence number is the corresponding Resource Unit of l are (t is MIMO number of transmit antennas sequence number, and T is the transmitting antenna sum) SINR to sequence number _{PRB, l} ^{(n, t)}In downlink resource shown in Figure 1, it is the bearing downlink reference signal that the part Resource Unit is arranged, and agreement is stipulated the position of reference signal wherein.UE utilizes reference signal can carry out channel quality measurement.

Based on above-mentioned analysis, among the present invention, utilize the SINR of Resource Unit on the reference position that each code word is mapped in nominated bandwidth, characterize the SINR of each code word.

Particularly, the CQI production method among the present invention specifically comprises as shown in Figure 2:

Step 201, according to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on all reference signal positions of calculate determining, result of calculation is sent the SINR of code word as this;

Step 202 according to each SINR that sends code word, generates the CQI sequence number that each sends the code word correspondence.

Wherein, for different signalling formulas, sending code word may be different with the mapping mode of reference position.Therefore, the corresponding reference position of determining for calculating transmission code word SINR also may be different.Concrete definite mode is described hereinafter.

The present invention gives a kind of CQI generation device, for generation of the CQI of nominated bandwidth correspondence.The concrete structure of this device comprises SINR computing unit and CQI generation unit.Wherein, the SINR computing unit, be used for according to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on each reference signal position of calculate determining, result of calculation is sent the SINR of code word as this; The CQI generation unit, each that is used for obtaining according to described SINR computing unit sends the SINR of code word, generates the CQI sequence number that each sends the code word correspondence.

Next by specific embodiment specific implementation of the present invention is described.The following examples can be implemented in above-mentioned CQI generation device.

Embodiment:

The method that generates CQI in the concrete embodiment of the invention comprises:

Step 301, corresponding each code word is calculated the SINR of this code word.

Because the receptivity by data on the reference signal position can characterize current channel conditions, therefore, when calculating the SINR value that each sends code word, this is sent the SINR average of Resource Unit on all reference signal positions of code word correspondence as the SINR of this transmission code word among the present invention.Wherein, send code word corresponding reference signal location each reference signal position of being mapped to of this transmission code word just.

As previously mentioned, send form for different signal, sending code word can be different with the mapping relations of reference signal position, below is example with several signalling formulas commonly used in the present LTE system, illustrates that each sends the SINR calculating of code word among the present invention.

At present, common signal transmission form comprises: the signal transmission under the single output of the single input SISO system and the signal under the multiple-input and multiple-output mimo system send.Wherein, the signal under the multiple-input and multiple-output mimo system sends and also is divided into transmit diversity and spatial reuse.Fig. 3-Fig. 5 provides the position view of reference signal under the different antenna port numbers respectively.The position view of reference signal, wherein R under this antenna port when Fig. 3 has only an antenna port for system ₀Represent the reference signal position; The position view of reference signal, wherein R when Fig. 4 has two antenna ports for system ₀Representative antennas port one corresponding reference signal location, R ₁Representative antennas port one corresponding reference signal location; The position view of reference signal when Fig. 5 has four antenna ports for system, wherein, R wherein ₀Representative antennas port one corresponding reference signal location, R ₁Representative antennas port one corresponding reference signal location, R ₂Representative antennas port one corresponding reference signal location, R ₃Representative antennas port one corresponding reference signal location.

Particularly, for the transmission diversity under single input single output SISO system and the multiple-input and multiple-output mimo system, it all is directly corresponding with the reference signal position of antenna port sending code word; And for the space division multiplexing under the multiple-input and multiple-output mimo system, it is directly corresponding with the reference signal position of antenna stack sending code word, and therefore, it is different that it calculates the concrete mode that sends code word SINR, below description respectively.

One, for the transmission diversity under single input single output SISO system and the multiple-input and multiple-output mimo system

At first calculate the SINR that sends each Resource Unit on the corresponding reference signal position that is mapped to of code word, be specially:

The channel response of determining arbitrary Resource Unit is

Wherein,

Be Resource Block sequence number, N _SC ^RBBe the number of frequency bands that comprises in the Resource Block, k is whole frequency domain band number, and l is the time-domain symbol sequence number of reference signal, and n is the frequency domain band number of a Resource Block internal reference signals, and R is the reception antenna number, and T is number of transmit antennas,

(n l) goes up transmitting antenna t to the channel response between the reception antenna r for Resource Unit;

(n, l) upward the SINR value of transmitting antenna t is in the computational resource unit ${\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l}^n\right)}^H\left(H_{\mathrm{PRB},l}^n\right)\right]}_{t,t}}{{\mathrm{\σ}}^2},$ Wherein, σ ²Be the noise power in the nominated bandwidth, [] _{T, t}For getting the capable t column element of t of matrix.

Next, determine that each sends the SINR of code word, is specially:

1) under the single output of the single input SISO system, a transmit antennas, a reception antenna has only one to send code word; Under this signal transmission form, it is corresponding with all the reference signal positions in the nominated bandwidth that this sends code word, therefore, and with the average of the SINR value of Resource Unit on all the reference signal positions in each Resource Block in the nominated bandwidth, send the SINR of code word as this, namely

$\mathrm{SINRl}=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\Σ}}}\underset{n=1}{\overset{4}{\mathrm{\Σ}}}\underset{l=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,1)},$ N_PRB is total number of resource blocks in the nominated bandwidth.

2) under the multiple-input and multiple-output mimo system, adopt transmit diversity, have only a code word; Under this signal transmission form, it is corresponding with all reference signal positions under interior all antenna ports of nominated bandwidth that this sends code word, therefore, average with the SINR value of the locational Resource Unit of all reference signals in each Resource Block on all antenna ports in the nominated bandwidth, send the SINR of code word as this, namely

$\mathrm{SINRl}=\frac{1}{T*N\_\mathrm{PRB}*4*2}\underset{t=1}{\overset{T}{\mathrm{\Σ}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\Σ}}}\underset{n=1}{\overset{4}{\mathrm{\Σ}}}\underset{l=1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)},$ N_PRB is total PRB number of resource blocks, and T is number of transmit antennas.

Two, the spatial reuse under the multiple-input and multiple-output mimo system

At first calculate the SINR that sends each Resource Unit on the corresponding reference signal position that is mapped to of code word:

The channel response of determining Resource Unit is

Wherein,

Be the Resource Block sequence number, k is whole frequency domain band number, and l is the time-domain symbol sequence number of reference signal, and n is the frequency domain band number of a Resource Block internal reference signals, and R is the reception antenna number, and T is number of transmit antennas, (n l) goes up transmitting antenna t to the channel response between the reception antenna r for Resource Unit;

The channel response of Resource Unit on each reference signal position under the antenna port is transformed under the antenna stack channel response of Resource Unit on each reference signal position, is specially,

$H_{\mathrm{PRB},l,m}^n=H_{\mathrm{PRB},l}^n*W$ When there not being the CDD pattern

$H_{\mathrm{PRB},l,m}^n=H_{\mathrm{PRB},l}^n*W*D*U$ As the CDD pattern

Wherein, W/D/U provides in the existing protocol;

(n, l) upward the SINR value of transmitting antenna t is to calculate Resource Unit under the antenna stack m ${\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}=\frac{{\left[{\left(H_{\mathrm{PRB},l,m}^n\right)}^H\left(H_{\mathrm{PRB},l,m}^n\right)\right]}_{m,m}}{{\mathrm{\σ}}^2},$ Wherein, σ ²Be the noise power in the nominated bandwidth, [] _{M, m}For getting the capable m column element of m of matrix.

Next, determine that each sends the SINR of code word, is specially:

1) spatial reuse under the mimo system, the antenna number of plies is 1, has only a code word; Under this signal transmission form, it is corresponding that this sends 1 time all reference position of code word and nominated bandwidth internal antenna layer, therefore, and with the average of the SINR value of Resource Unit on 1 time all reference signal position of antenna stack in each Resource Block in the nominated bandwidth, send the SINR of code word as this, namely

$\mathrm{<figure-callout\; id="1"\; label="SINR"\; filenames="H2009102416222E00022.png,H2009102416222E00031.png"\; state="\{\{state\}\}">SINR</figure-callout>}1=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,1}^{\left(n\right)},$ Wherein, N_PRB is total PRB number of resource blocks

2) spatial reuse under the mimo system, the antenna number of plies is 2, has only a code word; Under this signal transmission form, it is corresponding with all reference positions of nominated bandwidth internal antenna layer 1 and antenna stack 2 that this sends code word, therefore, average with the SINR value of Resource Unit on all reference signal positions of antenna stack 1 in each Resource Block in the nominated bandwidth and antenna stack 2, send the SINR of code word as this, namely

$\mathrm{<figure-callout\; id="1"\; label="SINR"\; filenames="H2009102416222E00022.png,H2009102416222E00031.png"\; state="\{\{state\}\}">SINR</figure-callout>}1=\frac{1}{2*N\_\mathrm{PRB}*4*2}\underset{m=1}{\overset{2}{\mathrm{\&Sigma;}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}$

3) spatial reuse under the mimo system, the antenna number of plies is 2, has two to send code word; Under this signal transmission form, it is corresponding with all reference positions of nominated bandwidth internal antenna layer 1 that first sends code word, second transmission code word is corresponding with all reference positions of nominated bandwidth internal antenna layer 2, therefore, average with the SINR value of Resource Unit on all reference signal positions of antenna stack 1 in each Resource Block in the nominated bandwidth, send the SINR of code word as first, namely $\mathrm{<figure-callout\; id="1"\; label="SINR"\; filenames="H2009102416222E00022.png,H2009102416222E00031.png"\; state="\{\{state\}\}">SINR</figure-callout>}1=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,1}^{\left(n\right)};$ With the average of the SINR value of Resource Unit on all reference signal positions of antenna stack 2 in each Resource Block in the nominated bandwidth, as second SINR that sends code word, namely $\mathrm{<figure-callout\; id="2"\; label="SINR"\; filenames="H2009102416222E00042.png"\; state="\{\{state\}\}">SINR</figure-callout>}2=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,2}^{\left(n\right)}$

4) spatial reuse under the mimo system, the antenna number of plies is 3, has two to send code word; Under this signal transmission form, it is corresponding with all reference positions of nominated bandwidth internal antenna layer 1 that first sends code word, second transmission code word is corresponding with all reference positions of nominated bandwidth internal antenna layer 2 and antenna stack 3, therefore, average with the SINR value of Resource Unit on all reference signal positions of antenna stack 1 in each Resource Block in the nominated bandwidth, send the SINR of code word as first, namely $\mathrm{<figure-callout\; id="1"\; label="SINR"\; filenames="H2009102416222E00022.png,H2009102416222E00031.png"\; state="\{\{state\}\}">SINR</figure-callout>}1=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,1}^{\left(n\right)};$ With the average of the SINR value of Resource Unit on all reference signal positions of antenna stack 2 in each Resource Block in the nominated bandwidth and antenna stack 3, as second SINR that sends code word, namely $\mathrm{<figure-callout\; id="2"\; label="SINR"\; filenames="H2009102416222E00042.png"\; state="\{\{state\}\}">SINR</figure-callout>}2=\frac{1}{2*N\_\mathrm{PRB}*4*2}\underset{m=2}{\overset{3}{\mathrm{\&Sigma;}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}$

5) spatial reuse under the mimo system, the antenna number of plies is 4, has two to send code word; Under this signal transmission form, it is corresponding with all reference positions of nominated bandwidth internal antenna layer 1 and antenna stack 2 that first sends code word, second transmission code word is corresponding with all reference positions of nominated bandwidth internal antenna layer 3 and antenna stack 4, therefore, average with the SINR value of Resource Unit on all reference signal positions of antenna stack 1 in each Resource Block in the nominated bandwidth and antenna stack 2, send the SINR of code word as first, namely $\mathrm{SINR}1=\frac{1}{2*N\_\mathrm{PRB}*4*2}\underset{m=1}{\overset{2}{\mathrm{\&Sigma;}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)};$ With the average of the SINR value of Resource Unit on all reference signal positions of antenna stack 3 in each Resource Block in the nominated bandwidth and antenna stack 4, as second SINR that sends code word, namely $\mathrm{SINR}2=\frac{1}{2*N\_\mathrm{PRB}*4*2}\underset{m=3}{\overset{4}{\mathrm{\&Sigma;}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}.$

By the way, namely can calculate the SINR of each code word according to the signalling formula.

Step 302 according to the SINR value of each code word, generates the CQI of each code word correspondence.

The implementation of this step is identical with existing mode, namely utilizes the SINR value of preservation in advance and the corresponding relation of CQI sequence number, determines the CQI sequence number of each code word correspondence.

For example, can determine corresponding CQI sequence number according to table 1 as follows.

Table 1

So far, the CQI among the present invention generates the method flow end.As previously mentioned, above-mentioned CQI generation method can be finished in CQI generating apparatus of the present invention, finishes in the passable SINR computing unit of the operation in the concrete above-mentioned steps 101, and the operation in the step 102 can be finished by the CQI generation unit.

Use the method and apparatus of the invention described above when carrying out the CQI generation, realize simple, simultaneously also can guarantee the transfer of data of the high-throughput among the LTE, thereby satisfy the professional needs that sharply increase of wireless high-speed data, can be applied in LTE-TDD system and LTE-FDD system.

Being preferred embodiment of the present invention only below, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. the generation method of CQI in the LTE system is used for being created on that each sends the CQI of code word correspondence in the nominated bandwidth, it is characterized in that this method comprises:

According to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on all reference signal positions of calculate determining, with the SINR average that the calculates SINR as this transmission code word, wherein, a plurality of Resource Units constitute a Resource Block, a Resource Block is carried out frequency domain and time domain simultaneously cut apart and form a plurality of Resource Units;

Send the SINR of code word according to each, utilize the SINR value of preservation in advance and the corresponding relation of CQI sequence number, determine the CQI sequence number of each code word correspondence, thereby generate the CQI sequence number that each sends the code word correspondence.

2. method according to claim 1 is characterized in that, when described signalling formula was the single output of single input SISO, described transmission code word had only one;

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all the reference signal positions in nominated bandwidth in each Resource Block.

3. method according to claim 1 is characterized in that, when described signalling formula was transmit diversity among the multiple-input and multiple-output MIMO, described transmission code word had only one;

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all the reference signal positions in each Resource Block in nominated bandwidth on each transmitting antenna and each reception antenna.

4. according to claim 2 or 3 described methods, it is characterized in that the SINR that calculates Resource Unit on the described reference signal position is:

${\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l}^n\right)}^H\left(H_{\mathrm{PRB},l}^n\right)\right]}_{t,t}}{{\mathrm{\&sigma;}}^2},$ Wherein, PRB is the sequence number of Resource Block, and n and l are respectively band number and the time domain sequence number of reference signal position, and t is the transmitting antenna sequence number, σ ²Be the noise power in the nominated bandwidth, H is the channel response of Resource Unit on the described reference signal position, [] _{T, t}For getting the capable t column element of t of matrix.

5. method according to claim 1 is characterized in that, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 1, described transmission code word has only one;

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack in nominated bandwidth in each Resource Block.

6. method according to claim 1 is characterized in that, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 2, if described transmission code word has only one, then:

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack and second antenna stack in nominated bandwidth in each Resource Block.

7. method according to claim 1 is characterized in that, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 2, if described transmission code word has two, then sends code word for first,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack in nominated bandwidth in each Resource Block;

For second transmission code word,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to second antenna stack in nominated bandwidth in each Resource Block.

8. method according to claim 1 is characterized in that, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 3, described transmission code word has two, sends code word for first,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack in nominated bandwidth in each Resource Block;

For second transmission code word,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to second antenna stack and third antenna layer in nominated bandwidth in each Resource Block.

9. method according to claim 1 is characterized in that, when described signalling formula is spatial reuse among the multiple-input and multiple-output MIMO and the antenna number of plies when being 4, described transmission code word has two, sends code word for first,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to first antenna stack and second antenna stack in nominated bandwidth in each Resource Block;

For second transmission code word,

Each reference signal position that this transmission code word is mapped in nominated bandwidth is: all reference signal positions that are mapped to third antenna layer and the 4th antenna stack in nominated bandwidth in each Resource Block.

10. according to arbitrary described method in the claim 5 to 9, it is characterized in that the SINR that calculates Resource Unit on the described reference signal position is:

${\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}=\frac{{\left[{\left(H_{\mathrm{PRB},l,m}^n\right)}^H\left(H_{\mathrm{PRB},l,m}^n\right)\right]}_{m,m}}{{\mathrm{\&sigma;}}^2},$ Wherein, PRB is the sequence number of Resource Block, and n and l are respectively band number and the time domain sequence number of reference signal position, and m is the antenna stack sequence number, σ ²Be the noise power in the nominated bandwidth, H is the channel response that is mapped to Resource Unit on the reference signal position of m antenna stack, [] _{M, m}For getting the capable m column element of m of matrix.

11. the generating apparatus of CQI in the LTE system is used for being created on that each sends the CQI of code word correspondence in the nominated bandwidth, it is characterized in that this device comprises:

The SINR computing unit, be used for according to the signalling formula of current network side to the UE side, corresponding each transmission code word, determine each reference signal position that this transmission code word is mapped in nominated bandwidth, and the signal to noise ratio SINR average of Resource Unit on each reference signal position of calculate determining, with the SINR average that the calculates SINR as this transmission code word, wherein, a plurality of Resource Units constitute a Resource Block, a Resource Block is carried out frequency domain and time domain simultaneously cut apart and form a plurality of Resource Units;

The CQI generation unit, each that is used for obtaining according to described SINR computing unit sends the SINR of code word, utilize the SINR value of preservation in advance and the corresponding relation of CQI sequence number, determine the CQI sequence number of each code word correspondence, thereby generate the CQI sequence number that each sends the code word correspondence.

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