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

Method and device for generating channel quality indication in LTE (Long term evolution) system

Technical Field

The present invention relates to adaptive modulation and coding technologies, and in particular, to a method and an apparatus for generating a channel quality indicator in an LTE system.

Background

Currently, the third generation mobile communication technology (3G) is gradually commercialized in China, and a Long Term Evolution (LTE) technology is studied to further improve communication quality and performance. Compared with 3G, the LTE technology has more technical advantages, which are specifically embodied in that: high data rate, packet transfer, delay reduction, wide area coverage and downward compatibility. LTE achieves its excellent performance not only by simplifying the structure, but also by employing several key technologies: transmission techniques and multiple access techniques, macro diversity, modulation and coding, multi-antenna techniques.

Meanwhile, the adaptive coded modulation technology is also beginning to be applied in LTE. In the adaptive modulation and coding technology, the channel quality of downlink data is measured at the UE user side, and a Channel Quality Indicator (CQI) is fed back to a base station according to the channel quality value, wherein the CQI comprises the recommended transport block size and the modulation mode determined by the UE according to the current channel quality, so that the adaptive coding and modulation strategy is realized.

In the LTE system, at most two code words are supported, and corresponding CQI corresponding to each code word is fed back to a base station. Currently, although adaptive coded modulation techniques have been proposed, there is no mature solution for how to generate CQI based on channel quality.

Disclosure of Invention

In view of the above, the present invention provides a method and an apparatus for generating CQI in an LTE system, which can generate CQI information according to channel quality.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for generating CQI in an LTE system, for generating CQI corresponding to each transmitted codeword within a specified bandwidth, the method comprising:

according to the signal transmission mode from the current network side to the UE side, corresponding to each transmitted code word, determining each reference signal position to which the transmitted code word is mapped in the specified bandwidth, calculating the average value of the signal-to-noise ratios (SINRs) of the resource units at all the determined reference signal positions, and taking the calculation result as the SINR of the transmitted code word;

and generating a CQI serial number corresponding to each sending code word according to the SINR of each sending code word.

Preferably, when the signal transmission mode is single-input single-output SISO, there is only one code word to be transmitted;

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations in each resource block within a specified bandwidth.

Preferably, when the signal transmission mode is transmit diversity in MIMO, there is only one code word to be transmitted;

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations in the respective resource blocks on each transmit antenna and each receive antenna within a specified bandwidth.

Preferably, the SINR of the resource unit at the reference signal position is calculated as:

${\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l}^n\right)}^H\left(H_{\mathrm{PRB},l}^n\right)\right]}_{t,t}}{{\mathrm{\σ}}^2},$ PRB is the serial number of resource block, n and l are the frequency band serial number and time domain serial number of reference signal position, t is the serial number of transmitting antenna, sigma²For noise power within a given bandwidth, H is the channel response of the resource unit at the reference signal location [ ·]_t，tIs taken as the element in the t-th row and t-th column of the matrix.

Preferably, when the signal transmission mode is spatial multiplexing in MIMO and the number of antenna layers is 1, there is only one code word to be transmitted;

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations mapped to the first antenna layer in each resource block within the specified bandwidth.

Preferably, when the signal transmission method is spatial multiplexing in MIMO and the number of antenna layers is 2, if there is only one transmitted codeword, then:

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations mapped to the first antenna layer and the second antenna layer in each resource block within a specified bandwidth.

Preferably, when the signaling scheme is spatial multiplexing in MIMO and the number of antenna layers is 2, if there are two transmit codewords, then for the first transmit codeword,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: mapping all reference signal positions of the first antenna layer in each resource block in the specified bandwidth;

for the second transmitted code word,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations mapped to the second antenna layer in each resource block within the specified bandwidth.

Preferably, when the signaling scheme is spatial multiplexing in MIMO and the number of antenna layers is 3, there are two transmission codewords, and for the first transmission codeword,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: mapping all reference signal positions of the first antenna layer in each resource block in the specified bandwidth;

for the second transmitted code word,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: and mapping all reference signal positions of the second antenna layer and the third antenna layer in each resource block within the specified bandwidth.

Preferably, when the signaling scheme is spatial multiplexing in MIMO and the number of antenna layers is 4, there are two transmission codewords, and for the first transmission codeword,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: mapping all reference signal positions of a first antenna layer and a second antenna layer in each resource block in a specified bandwidth;

for the second transmitted code word,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: and mapping all reference signal positions of the third antenna layer and the fourth antenna layer in each resource block within the specified bandwidth.

Preferably, the SINR of the resource unit at the reference signal position is calculated as:

${\mathrm{SINR}}_{\mathrm{PRB},l,m}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l,m}^n\right)}^H\left(H_{\mathrm{PRB},l,m}^n\right)\right]}_{m,m}}{{\mathrm{\σ}}^2},$ PRB is the serial number of resource block, n and l are the frequency band serial number and time domain serial number of reference signal position, m is the serial number of antenna layer, sigma²For noise power within a given bandwidth, H is the channel response of the resource unit at the reference signal location mapped to the mth antenna layer [ ·]_m，mIs taken to be the mth row and mth column element of the matrix.

An apparatus for generating CQI for each transmitted codeword within a specified bandwidth in an LTE system, the apparatus comprising:

an SINR calculation unit, configured to determine, according to a signal transmission manner from a current network side to a UE side, each reference signal position to which the transmission codeword is mapped within a specified bandwidth, and calculate a signal-to-noise ratio (SINR) average value of a resource unit at each determined reference signal position, and use a calculation result as an SINR of the transmission codeword;

and a CQI generating unit, configured to generate a CQI serial number corresponding to each transmission codeword according to the SINR of each transmission codeword obtained by the SINR calculating unit.

According to the technical scheme, when the CQI corresponding to each sending code word in the bandwidth is generated corresponding to a specified bandwidth, firstly, according to the signal sending mode from the current network side to the UE side, corresponding to each sending code word, determining each reference signal position to which the sending code word is mapped in the specified bandwidth, and calculating the signal-to-noise ratio (SINR) average value of resource units on all the determined reference signal positions, wherein the calculated average value is the SINR average value on the reference signal position corresponding to the code word, so that the calculated average value can be used as the SINR of the sending code word; then, according to the SINR of each transmission codeword, a CQI number corresponding to each transmission codeword is generated. By the above method, SINR of each codeword can be simply and conveniently obtained, and then CQI corresponding to each codeword is obtained, and the CQI value is determined according to SINR capable of reflecting current channel condition, so that the method can be applied to adaptive modulation and coding, and can practically provide high-throughput data transmission on the premise of effectively ensuring system performance.

Drawings

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

Fig. 2 is a flowchart of a CQI generation method in the present invention.

Fig. 3 is a schematic diagram of reference signal positions for 1 antenna port.

Fig. 4a is a schematic diagram of a reference signal position corresponding to a first antenna port when there are 2 antenna ports.

Fig. 4b is a schematic diagram of the reference signal position corresponding to the second antenna port when there are 2 antenna ports.

Fig. 5a is a schematic diagram of a reference signal position corresponding to a first antenna port when there are 4 antenna ports.

Fig. 5b is a schematic diagram of the reference signal position corresponding to the second antenna port when there are 4 antenna ports.

Fig. 5c is a schematic diagram of reference signal positions corresponding to a third antenna port when there are 4 antenna ports.

Fig. 5d is a schematic diagram of a reference signal position corresponding to a fourth antenna port when there are 4 antenna ports.

Detailed Description

For the purpose of making the objects, technical means and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

The basic idea of the invention is: and calculating the SINR of each sending code word, and generating the CQI information of each sending code word according to the SINR of each sending code word.

Specifically, in the CQI report of the existing LTE system, there are full-band CQI reporting (reporting a full-band CQI by calculating a channel response within a bandwidth occupied by data) and sub-band CQI reporting (dividing the bandwidth occupied by data into several sub-bands, and reporting a corresponding CQI for each sub-band). Both full-band reporting and sub-band reporting correspond to each transmitted codeword, and a CQI under a corresponding bandwidth is reported. In the present invention, for the differentiation and application of full-band and sub-band CQI reporting, the same as the existing method, the following description does not distinguish sub-band and full-band CQI reporting, only describes CQI reporting of corresponding bandwidth, and the corresponding bandwidth that needs CQI reporting is referred to as specified bandwidth hereinafter. That is, the CQI is calculated using the channel response of the reference signal within the specified bandwidth.

Fig. 1 is a schematic diagram of a downlink resource unit in an LTE system. Each small block represents a resource unit, a resource block is represented in a bold solid black line, the horizontal direction represents the time domain direction, and the vertical direction represents the frequency domain direction.

Is the resource block sequence number, k is the whole frequency domain frequency band sequence number, and l is the time domain symbol sequence number. SINR for the corresponding resource unit with frequency domain frequency band number n and time domain number l in the resource block with PRB number is SINR (T is number of MIMO transmission antenna, T is total number of transmission antenna)_PRB，l ^(n，t). In the downlink resource shown in fig. 1, a part of resource units carry downlink reference signals, and the protocol has specified the positions of the reference signals therein. The UE may make channel quality measurements using the reference signals.

Based on the above analysis, in the present invention, the SINR of each codeword is characterized by the SINR of the resource unit at the reference position to which each codeword is mapped within a specified bandwidth.

Specifically, as shown in fig. 2, the CQI generating method in the present invention specifically includes:

step 201, according to the signal transmission mode from the current network side to the UE side, determining each reference signal position to which the transmission codeword is mapped within the specified bandwidth corresponding to each transmission codeword, and calculating the average value of the signal-to-noise ratios SINR of the resource units at all the determined reference signal positions, and taking the calculation result as the SINR of the transmission codeword;

step 202, according to the SINR of each transmission codeword, generating a CQI sequence number corresponding to each transmission codeword.

Wherein, for different signal transmission modes, the mapping mode of the transmission code word and the reference position may be different. Therefore, the reference position for calculating the SINR of the transmitted codeword may be determined differently. The specific determination manner is described below.

The invention also provides a CQI generating device which is used for generating the CQI corresponding to the appointed bandwidth. The specific structure of the device comprises an SINR calculation unit and a CQI generation unit. The SINR calculation unit is used for determining each reference signal position to which the sending code word is mapped in a specified bandwidth corresponding to each sending code word according to a signal sending mode from a current network side to a UE side, calculating the average value of the SINRs of the resource units at each determined reference signal position, and taking the calculation result as the SINR of the sending code word; and a CQI generating unit, configured to generate a CQI serial number corresponding to each transmission codeword according to the SINR of each transmission codeword obtained by the SINR calculating unit.

The following describes a specific implementation of the present invention by way of specific embodiments. The following embodiments may be implemented in the above-described CQI generation apparatus.

Example (b):

specifically, the method for generating CQI in the embodiment of the present invention includes:

step 301, calculating SINR of each codeword.

Because the current channel condition can be represented by the data receiving performance at the reference signal position, when the SINR value of each sending code word is calculated, the SINR average value of resource units at all reference signal positions corresponding to the sending code word is used as the SINR of the sending code word. The reference signal position corresponding to the transmission codeword is the reference signal position to which the transmission codeword is mapped.

As mentioned above, the mapping relationship between the transmission code word and the reference signal position is different for different signal transmission forms, and several signal transmission methods commonly used in the LTE system are taken as examples below to describe the SINR calculation of each transmission code word in the present invention.

Currently, the common signaling forms include: and signal transmission under a single-input single-output SISO system and signal transmission under a multi-input multi-output MIMO system. The signal transmission in the MIMO system is further divided into transmit diversity and spatial multiplexing. Fig. 3-5 are schematic diagrams of the positions of the reference signals under different numbers of antenna ports, respectively. FIG. 3 is a schematic diagram of the position of a reference signal under an antenna port when the system has only one antenna port, where R₀Represents a reference signal position; FIG. 4 is a schematic diagram of the location of a reference signal when the system has two antenna ports, where R₀Representing the position of the reference signal, R, corresponding to antenna port 1₁Representing the position of the reference signal corresponding to the antenna port 1; FIG. 5 is a schematic diagram of the location of a reference signal when the system has four antenna ports, where R is₀Representing the position of the reference signal, R, corresponding to antenna port 1₁Representing the position of the reference signal, R, corresponding to antenna port 1₂Representing the position of the reference signal, R, corresponding to antenna port 1₃Representing the corresponding reference signal location at antenna port 1.

Specifically, for the transmit diversity under the single-input single-output SISO system and the multiple-input multiple-output MIMO system, the transmit code word directly corresponds to the reference signal position of the antenna port; however, for the space division multiplexing in the MIMO system, the transmit codeword directly corresponds to the reference signal position of the antenna layer, and therefore, the specific way of calculating the SINR of the transmit codeword is different, which is described below.

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

First, calculating SINR of each resource unit at a reference signal position to which a transmission codeword is mapped, specifically:

determining the channel response of any resource unit as

Wherein,

is the resource block number, N_SC ^RBIs the number of frequency bands included in a resource block, k is the whole frequency domain frequency band number, l is the time domain symbol number of the reference signal, n is the frequency domain frequency band number of the reference signal in a resource block, R is the number of receiving antennas, T is the number of transmitting antennas,

is the channel response between the transmitting antenna t to the receiving antenna r on the resource unit (n, l);

calculating the SINR value of the transmitting antenna t on the resource unit (n, l) as ${\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l}^n\right)}^H\left(H_{\mathrm{PRB},l}^n\right)\right]}_{t,t}}{{\mathrm{\σ}}^2},$ Wherein，σ²For noise power within a specified bandwidth [ ·]_t，tIs taken as the element in the t-th row and t-th column of the matrix.

Next, determining SINR of each transmitted codeword, specifically:

1) under the single-input single-output SISO system, only one transmitting antenna and one receiving antenna send code words; in this signaling form, the transmitted codeword corresponds to all reference signal positions within the specified bandwidth, and therefore, the average of the SINR values of resource units at all reference signal positions in each resource block within the specified bandwidth is taken as the SINR of the transmitted codeword, i.e., the SINR

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

2) In a multi-input multi-output MIMO system, transmission diversity is adopted, and only one code word is available; in the signal transmission form, the transmission codeword corresponds to all reference signal positions of all antenna ports in the specified bandwidth, and therefore, the average value of the SINR values of resource units at all reference signal positions in each resource block on all antenna ports in the specified bandwidth is taken as the SINR of the transmission codeword, that is, the SINR of the transmission codeword

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

Spatial multiplexing under MIMO system

Firstly, calculating the SINR of each resource unit on a reference signal position to which a sending code word is correspondingly mapped:

determining a channel response of a resource unit as

Wherein,

is the resource block number, k is the whole frequency domain frequency band number, l is the time domain symbol number of the reference signal, n is the frequency domain frequency band number of the reference signal in one resource block, R is the number of receiving antennas, T is the number of transmitting antennas,is the channel response between the transmitting antenna t to the receiving antenna r on the resource unit (n, l);

converting the channel response of the resource unit at each reference signal position under the antenna port to the channel response of the resource unit at each reference signal position under the antenna layer, specifically,

$H_{\mathrm{PRB},l,m}^n=H_{\mathrm{PRB},l}^n*W$ when there is no CDD mode

$H_{\mathrm{PRB},l,m}^n=H_{\mathrm{PRB},l}^n*W*D*U$ When there is a CDD mode

Wherein, W/D/U is well specified in the existing protocol;

calculating the SINR value of a transmitting antenna t on a resource unit (n, l) under an antenna layer m to be ${\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}=\frac{{\left[{\left(H_{\mathrm{PRB},l,m}^n\right)}^H\left(H_{\mathrm{PRB},l,m}^n\right)\right]}_{m,m}}{{\mathrm{\σ}}^2},$ Wherein σ²For noise power within a specified bandwidth [ ·]_m，mIs taken to be the mth row and mth column element of the matrix.

Next, determining SINR of each transmitted codeword, specifically:

1) spatial multiplexing is carried out under the MIMO system, the number of antenna layers is 1, and only one code word is available; in the signal transmission form, the transmission codeword corresponds to all reference positions under the antenna layer 1 in the specified bandwidth, and therefore, the average value of the SINR values of the resource units at all reference signal positions under the antenna layer 1 in each resource block in the specified bandwidth is taken as the SINR of the transmission codeword, i.e. the SINR of the transmission codeword

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

2) Spatial multiplexing is carried out under the MIMO system, the number of antenna layers is 2, and only one code word is available; in the signal transmission form, the transmission codeword corresponds to all reference positions of antenna layer 1 and antenna layer 2 within the specified bandwidth, and therefore, the average value of SINR values of resource units at all reference signal positions of antenna layer 1 and antenna layer 2 in each resource block within the specified bandwidth is taken as SINR of the transmission codeword, that is, SINR of the transmission codeword

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

3) Under MIMO system, spatial multiplexing, the number of antenna layers is 2, and there are two sending code words; in this signaling form, the first transmission codeword corresponds to all reference positions of antenna layer 1 within the specified bandwidth, and the second transmission codeword corresponds to all reference positions of antenna layer 2 within the specified bandwidth, so the average of SINR values of resource units at all reference signal positions of antenna layer 1 in each resource block within the specified bandwidth is taken as the SINR of the first transmission codeword, i.e. the SINR of the first transmission codeword $\mathrm{SINR}$ $1=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,1}^{\left(n\right)};$ Taking the average value of SINR values of resource units at all reference signal positions of antenna layer 2 in each resource block in the specified bandwidth as the SINR of the second transmitted 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) Under MIMO system, spatial multiplexing, the number of antenna layers is 3, and there are two sending code words; in this signaling form, the first transmission codeword corresponds to all reference positions of antenna layer 1 within the specified bandwidth, and the second transmission codeword corresponds to all reference positions of antenna layer 2 and antenna layer 3 within the specified bandwidth, so the average of SINR values of resource units at all reference signal positions of antenna layer 1 in each resource block within the specified bandwidth is taken as the SINR of the first transmission codeword, i.e. the SINR of the first transmission codeword $\mathrm{SINR}$ $1=\frac{1}{N\_\mathrm{PRB}*4*2}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,1}^{\left(n\right)};$ Antenna in each resource block in appointed bandwidthThe average of the SINR values of the resource units at all reference signal positions of layer 2 and antenna layer 3 is taken as the SINR of the second transmitted codeword, i.e. the $\mathrm{<figure-callout\; id="2"\; label="SINR"\; filenames="H2009102416222E00042.png"\; state="\{\{state\}\}">SINR</figure-callout>}2=\frac{1}{2*N\_\mathrm{PRB}*4*2}\underset{m=2}{\overset{3}{\mathrm{\&Sigma;}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}$

5) Under MIMO system, spatial multiplexing, the number of antenna layers is 4, and there are two sending code words; in this signaling form, the first transmission codeword corresponds to all reference positions of antenna layer 1 and antenna layer 2 within the specified bandwidth, and the second transmission codeword corresponds to all reference positions of antenna layer 3 and antenna layer 4 within the specified bandwidth, so the average of SINR values of resource units at all reference signal positions of antenna layer 1 and antenna layer 2 in each resource block within the specified bandwidth is taken as the SINR of the first transmission codeword, i.e., the SINR of the first transmission codeword $\mathrm{SINR}1=\frac{1}{2*N\_\mathrm{PRB}*4*2}\underset{m=1}{\overset{2}{\mathrm{\&Sigma;}}}\underset{\mathrm{PRB}=1}{\overset{N\_\mathrm{PRB}}{\mathrm{\&Sigma;}}}\underset{n=1}{\overset{4}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{2}{\mathrm{\&Sigma;}}}{\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)};$ Taking the average value of the SINR values of the resource units at all the reference signal positions of the antenna layer 3 and the antenna layer 4 in each resource block in the specified bandwidth as the SINR of the second sending 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 above method, the SINR of each codeword can be calculated according to the signal transmission method.

Step 302, according to the SINR value of each codeword, generating a CQI corresponding to each codeword.

The implementation of this step is the same as the existing one, that is, the corresponding relation between the pre-stored SINR value and the CQI number is used to determine the CQI number corresponding to each codeword.

For example, the corresponding CQI number may be determined according to table 1 as shown below.

TABLE 1

So far, the flow of the CQI generation method in the present invention ends. As described above, the CQI generation method may be performed in the CQI generation apparatus of the present invention, specifically, the SINR calculation unit for the operation in step 101 may be performed, and the CQI generation unit for the operation in step 102 may be performed.

The method and the device of the invention are simple to realize when generating the CQI, and can ensure the data transmission with high throughput in LTE, thereby meeting the requirement of rapid increase of wireless high-speed data service and being applied to an LTE-TDD system and an LTE-FDD system.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A method for generating CQI in an LTE system, configured to generate CQI corresponding to each transmitted codeword within a specified bandwidth, the method comprising:

according to the signal transmission mode from the current network side to the UE side, corresponding to each transmission code word, determining each reference signal position to which the transmission code word is mapped in the specified bandwidth, calculating the signal-to-noise ratio (SINR) average value of resource units at all the determined reference signal positions, and taking the calculated SINR average value as the SINR of the transmission code word, wherein a plurality of resource units form a resource block, and the resource block is divided into a plurality of resource units in frequency domain and time domain at the same time;

and determining the CQI serial number corresponding to each code word according to the SINR of each transmission code word by utilizing the corresponding relation between the SINR value and the CQI serial number which is stored in advance, thereby generating the CQI serial number corresponding to each transmission code word.

2. The method of claim 1, wherein when the signal transmission mode is single-input single-output SISO, only one of the transmission code words is used;

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations in each resource block within a specified bandwidth.

3. The method of claim 1, wherein when the signaling scheme is transmit diversity in multiple-input multiple-output (MIMO), there is only one of the transmitted codewords;

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations in the respective resource blocks on each transmit antenna and each receive antenna within a specified bandwidth.

4. A method according to claim 2 or 3, characterized by calculating the SINR of the resource units at the reference signal position as:

${\mathrm{SINR}}_{\mathrm{PRB},l}^{(n,t)}=\frac{{\left[{\left(H_{\mathrm{PRB},l}^n\right)}^H\left(H_{\mathrm{PRB},l}^n\right)\right]}_{t,t}}{{\mathrm{\&sigma;}}^2},$ PRB is the serial number of resource block, n and l are the frequency band serial number and time domain serial number of reference signal position, t is the serial number of transmitting antenna, sigma²For noise power within a given bandwidth, H is the channel response of the resource unit at the reference signal location [ ·]_t,tIs taken as the element in the t-th row and t-th column of the matrix.

5. The method of claim 1, wherein when the signal transmission scheme is spatial multiplexing in MIMO and the number of antenna layers is 1, there is only one transmission codeword;

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations mapped to the first antenna layer in each resource block within the specified bandwidth.

6. The method of claim 1, wherein when the signal transmission scheme is spatial multiplexing in MIMO and the number of antenna layers is 2, if there is only one transmission codeword:

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations mapped to the first antenna layer and the second antenna layer in each resource block within a specified bandwidth.

7. The method of claim 1, wherein when the signal transmission scheme is spatial multiplexing in multiple-input multiple-output (MIMO) and the number of antenna layers is 2, if there are two of the transmission codewords, then for a first transmission codeword,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: mapping all reference signal positions of the first antenna layer in each resource block in the specified bandwidth;

for the second transmitted code word,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: all reference signal locations mapped to the second antenna layer in each resource block within the specified bandwidth.

8. The method of claim 1, wherein when the signal transmission scheme is spatial multiplexing in multiple-input multiple-output (MIMO) and the number of antenna layers is 3, there are two transmission codewords, and for a first transmission codeword,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: mapping all reference signal positions of the first antenna layer in each resource block in the specified bandwidth;

for the second transmitted code word,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: and mapping all reference signal positions of the second antenna layer and the third antenna layer in each resource block within the specified bandwidth.

9. The method of claim 1, wherein when the signal transmission scheme is spatial multiplexing in multiple-input multiple-output (MIMO) and the number of antenna layers is 4, there are two transmission codewords, and for a first transmission codeword,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: mapping all reference signal positions of a first antenna layer and a second antenna layer in each resource block in a specified bandwidth;

for the second transmitted code word,

the reference signal positions to which the transmission code words are mapped within the specified bandwidth are as follows: and mapping all reference signal positions of the third antenna layer and the fourth antenna layer in each resource block within the specified bandwidth.

10. The method according to any of claims 5 to 9, wherein the SINR of the resource unit at the reference signal position is calculated as:

${\mathrm{SINR}}_{\mathrm{PRB},l,m}^{\left(n\right)}=\frac{{\left[{\left(H_{\mathrm{PRB},l,m}^n\right)}^H\left(H_{\mathrm{PRB},l,m}^n\right)\right]}_{m,m}}{{\mathrm{\&sigma;}}^2},$ PRB is the serial number of resource block, n and l are the frequency band serial number and time domain serial number of reference signal position, m is the serial number of antenna layer, sigma²For noise power within a given bandwidth, H is the channel response of the resource unit at the reference signal location mapped to the mth antenna layer [ ·]_m,mIs taken to be the mth row and mth column element of the matrix.

11. An apparatus for generating CQI for each transmitted codeword within a specified bandwidth in an LTE system, the apparatus comprising:

an SINR calculation unit, configured to determine, for each transmission codeword, each reference signal position to which the transmission codeword is mapped within a specified bandwidth according to a signal transmission manner from a current network side to a UE side, calculate an SINR mean value of resource units at each determined reference signal position, and use the calculated SINR mean value as an SINR of the transmission codeword, where a plurality of resource units form one resource block, and one resource block is divided in a frequency domain and a time domain at the same time to form a plurality of resource units;

and a CQI generation unit configured to determine a CQI number corresponding to each codeword based on the SINR of each transmission codeword obtained by the SINR calculation unit, using a correspondence between SINR values and CQI numbers stored in advance, and thereby generate a CQI number corresponding to each transmission codeword.

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