CN102612056B - Measuring method, system and device for downlink channel quality information - Google Patents

Abstract

The invention discloses a downlink CQI measurement method, system and device, which are used to solve the existing reference resources for CQI measurement in Release 10 and improve the accuracy of CQI measurement. In this method, when the terminal receives the information of triggering CQI reporting transmitted by the base station through the first downlink subframe, it searches for the second downlink subframe containing the CSI-RS according to the subframe sequence number of the first downlink subframe, and searches for the subframe A third downlink subframe whose frame number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe passes through the second downlink subframe and the third downlink subframe Perform CQI measurements. Since in the embodiment of the present invention, two downlink subframes are determined to perform CQI measurement by searching, the problem that CQI measurement cannot be performed can be avoided, and in addition, since CQI measurement is performed through two downlink subframes, the accuracy of CQI measurement can be improved.

Description

A method, system and device for measuring downlink channel quality information

technical field

The present invention relates to the technical field of wireless communication, in particular to a method, system and device for measuring downlink channel quality information (Channel Quality Information, CQI).

Background technique

In the Long Term Evolution (LTE) system, the downlink CQI is used to reflect the channel quality, and is usually reported by the terminal to the base station. The CQI includes: available Modulation and Coding Scheme (MCS) information, preset Coding vector (Precoding Matrix Indicator, PMI) information and information (Rank Indication, RI) and other information.

In the existing LTE Release 8 and Release 9 versions, when the terminal reports the CQI, it needs to measure the channel quality according to the CQI reference resource, that is, according to the common reference signal (common reference signal, CRS) to measure the channel quality, and then report the measured CQI to the base station.

In the 3GPP TS36.213 specification, it is specified which CRSs in downlink subframes can be used as CQI reference resources. The corresponding specifications specify the CQI reference resources in the frequency domain and the time domain respectively. However, in the Release 10 version of LTE, Transmission Mode 9 (Transmission Mode 9, TM9) was introduced to support higher-order Multiple-In-Multiple-Out (Multiple-In-Multiple-Out, MIMO) transmission, and specified in TM9 , the terminal can only measure the CQI based on the Channel State Information Reference Signal (CSI-RS). However, the density of CSI-RS in time domain and frequency domain is lower than that of CRS, and the appearance period of CSI-RS is generally configured as 5ms or 10ms, while CRS exists in every downlink subframe, that is, its period is 1ms.

As shown in Figure 1, when the subframe includes CSI-RS, the structural diagram of the time domain and frequency domain of the subframe, where the horizontal axis is the time axis, the vertical axis is the frequency axis, and 0 to 7 represent 8 antennas respectively The corresponding CSI-RS, the box with a square background represents the CRS, it can be seen that in a resource block (Resource Block, RB), a set of CSI-RS only occupies 8 resource units (Resource Element, RE), and the CRS occupies 16 REs.

In addition, almost blank subframes (Almost Blank Subframe, ABS) were introduced in Release 10 to avoid interlayer interference in a layered network, as shown in Figure 2, the uplink and downlink subframes of the cell where the terminal is located and its adjacent cells Schematic diagram of the structure. In principle, the network side does not send any unicast data on the ABS subframe. As shown in the figure, in a wireless frame, the network side does not Any unicast data is sent, so that the interference of the cell where the terminal is located to its neighboring cells can be minimized. Due to the introduction of the ABS subframe, the intensity of the interference signal corresponding to the two subframe sets of the ABS protected subframe and the non-ABS protected subframe in the interfered cell is very different, so the multi-measurement subframe was introduced in Release 10 The mechanism of the set, the specification stipulates that the number of measurement subsets is 2, and each measurement subset is composed of some downlink subframes. Due to the configuration scheme of the above-mentioned ABS subframe, the results of CQI measurement in the two measurement subsets may be very different.

Moreover, due to the introduction of the multi-measurement subset mechanism in Release 10, when the terminal receives the information for CQI reporting through the downlink subframe, since the CSI-RS can be configured to be sent relatively sparsely in the time domain, for example, its period is 10ms, There may be a situation that the measurement subset in which the downlink subframe carrying the information for CQI reporting is located has no available CSI-RS, thus making it impossible to perform CQI measurement reporting.

Contents of the invention

In view of this, the embodiments of the present invention provide a method, system and device for measuring downlink channel quality information, which are used to indicate reference resources for CQI measurement in Release 10, and improve the accuracy of CQI measurement.

A downlink CQI measurement method provided by an embodiment of the present invention includes:

The terminal receives information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe;

According to the subframe sequence number of the first downlink subframe, in the wireless frame where the downlink subframe is located, search for a subframe sequence number not less than the subframe sequence number of the first downlink subframe, and include a channel state information reference signal The second downlink subframe of the CSI-RS;

According to the subframe sequence numbers of the first downlink subframe and the second downlink subframe, search for the subframe sequence number not less than the subframe sequence number of the first downlink subframe and not greater than the subframe sequence number of the second downlink subframe The third downlink subframe of the frame sequence number;

The CQI measurement is performed by using the found second downlink subframe and the third downlink subframe.

A downlink CQI measurement device provided in an embodiment of the present invention includes:

A receiving module, configured to receive information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe;

A search module, configured to search for a subframe number not less than the subframe number of the first downlink subframe in the wireless frame where the downlink subframe is located according to the subframe number of the first downlink subframe, and includes In the second downlink subframe of the channel state information reference signal CSI-RS, according to the subframe numbers of the first downlink subframe and the second downlink subframe, search for a subframe whose subframe number is not less than the first downlink subframe a frame number, and a third downlink subframe not greater than the subframe number of the second downlink subframe;

A measurement module, configured to use the found second downlink subframe and third downlink subframe to perform CQI measurement.

A downlink CQI measurement system provided by an embodiment of the present invention includes:

The base station is configured to transmit information that triggers channel quality CQI reporting in the first downlink subframe;

The terminal is configured to receive the information transmitted by the base station on the first downlink subframe that triggers the reporting of channel quality information CQI, and according to the subframe sequence number of the first downlink subframe, search The subframe sequence number is not less than the subframe sequence number of the first downlink subframe, and contains the second downlink subframe of the channel state information reference signal CSI-RS, according to the first downlink subframe and the second downlink subframe Subframe number, find the third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe, and use the found CQI measurement is performed in the second downlink subframe and the third downlink subframe.

Embodiments of the present invention provide a method, system, and device for measuring downlink CQI. In the method, when the terminal receives the information that triggers CQI reporting transmitted by the base station through the first downlink subframe, the terminal according to the first downlink subframe Find the subframe number of the second downlink subframe that contains the CSI-RS, and find the subframe number that is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe In the third downlink subframe with the serial number, the CQI measurement is performed through the second downlink subframe and the third downlink subframe. Since in the embodiment of the present invention, two downlink subframes are determined to perform CQI measurement by searching, the problem that CQI measurement cannot be performed can be avoided, and in addition, since CQI measurement is performed through two downlink subframes, the accuracy of CQI measurement can be improved.

Description of drawings

FIG. 1 is a schematic structural diagram of the time domain and frequency domain of the subframe when the subframe includes CSI-RS;

FIG. 2 is a schematic structural diagram of uplink and downlink subframes of the cell where the terminal is located and its adjacent cells;

FIG. 3 is a downlink CQI measurement process provided by an embodiment of the present invention;

FIG. 4 provides a downlink CQI measurement and reporting process according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device for measuring downlink channel quality information provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a system for measuring downlink channel quality information provided by an embodiment of the present invention.

Detailed ways

In order to indicate the reference resources for CQI measurement in Release 10 and improve the accuracy of CQI measurement in the embodiment of the present invention, a downlink CQI measurement method, system and device are provided. In the method, two downlink subframes are searched, one of which is The downlink subframe contains CSI-RS, and the CQI measurement is performed through the found two downlink subframes, so that the CQI measurement can be realized in any case, and the CQI measurement is performed through the two downlink subframes, which can ensure the accuracy of the measurement .

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Figure 3 is a downlink CQI measurement process provided by an embodiment of the present invention, the process includes the following steps:

S301: The terminal receives information that triggers reporting of channel quality information CQI transmitted by the base station on the first downlink subframe.

When the base station needs to know the channel quality information, it transmits the information triggering CQI reporting in a certain downlink subframe, that is, the first downlink subframe. In addition, the base station notifies a manner of triggering CQI reporting, which is generally aperiodic CQI reporting.

S302: According to the subframe sequence number of the first downlink subframe, in the wireless frame where the downlink subframe is located, search for a subframe sequence number not smaller than the subframe sequence number of the first downlink subframe, and including channel state information The second downlink subframe of the reference signal CSI-RS.

When the terminal receives the information that triggers CQI reporting transmitted by the base station, according to the subframe sequence number of the first downlink subframe, for example, N, in the wireless frame where the first downlink subframe is located, search for the subframe sequence number that is not A second downlink subframe that is smaller than the subframe number of the first downlink subframe and includes the CSI-RS, for example, the subframe number of the downlink subframe is M, where M≥N. That is, after receiving the first downlink subframe, the terminal selects a downlink subframe including the CSI-RS, and uses the downlink subframe as the second downlink subframe.

S303: According to the subframe numbers of the first downlink subframe and the second downlink subframe, search for the subframe number not less than the subframe number of the first downlink subframe and not greater than the second downlink subframe The third downlink subframe of the subframe sequence number.

Specifically, after determining the downlink subframe including the CSI-RS, the terminal will select another downlink subframe to perform CQI measurement together with the downlink subframe including the CSI-RS.

S304: Perform CQI measurement by using the found second downlink subframe and third downlink subframe.

In the embodiment of the present invention, independent configuration is performed for each CQI reference resource. Specifically, the base station transmits information triggering CQI reporting through the first downlink subframe, and the terminal needs to search for the downlink subframe for CQI measurement according to the subframe sequence number of the first downlink subframe. Specifically, when performing CQI measurement, in the embodiment of the present invention, the reported CQI is measured through at least two downlink subframes, wherein one downlink subframe is a downlink subframe containing a CSI-RS, and the other downlink subframe may be a A downlink subframe including CSI-RS, specifically a downlink subframe including CRS.

After the terminal determines the subframe sequence number of the first downlink subframe, in order to avoid that the measurement subset where the first downlink subframe is located has no available CSI-RS for CQI measurement, the terminal performs CQI measurement in the radio frame where the first subframe is located Within, search for a second downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and contains CSI-RS. That is, the subframe number of the second downlink subframe including the CSI-RS is not less than the subframe number of the first downlink subframe.

Moreover, in order to ensure the accuracy of CQI measurement in the embodiment of the present invention, it is also necessary to select another downlink subframe for CQI measurement according to the subframe number of the first downlink subframe, that is, select the third downlink subframe, wherein the The subframe sequence number of the third downlink subframe is not less than the subframe sequence number of the first downlink subframe and not greater than the subframe sequence number of the second downlink subframe.

Specifically, when the third downlink subframe is selected, the first measurement subset in which the first downlink subframe is located is determined, and in the first measurement subset, the search subframe sequence number is not less than the first downlink subframe The subframe sequence number of the subframe, and the third downlink subframe that is not greater than the subframe sequence number of the second downlink subframe.

Alternatively, when searching for the third downlink subframe for CQI measurement, the first measurement subset where the first downlink subframe is located may also be determined, and the second measurement subset where the first downlink subframe is not located is determined. Centrally, search for a third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe.

In the above process of the embodiment of the present invention, the downlink subframes included in each measurement subset may or may not be repeated. When the downlink subframes included in the measurement subset are not repeated, that is, each downlink subframe is only located in one In the measurement subset, when searching for the third downlink subframe for CQI measurement, in the first measurement subset where the first downlink subframe is located, the sequence number of any found subframe is not less than that of the first subframe and the third downlink subframe whose subframe number is not greater than the subframe number of the second downlink subframe.

Specifically, for example, a radio frame includes several downlink subframes with subframe numbers 0 to 9, wherein the downlink subframes with subframe numbers 0, 2, 4, 6, and 8 are located in a measurement subset, and the subframes Downlink subframes with frame numbers 1, 3, 5, 7, and 9 are located in another measurement subset, and the base station transmits information triggering CQI reporting on the downlink subframe with subframe number 2. After receiving the information reported by the CQI, the terminal searches for the second downlink subframe that is larger than the subframe number 2 and contains the CSI-RS in the radio frame with the subframe number 2, for example, in the radio frame at this time , the downlink subframe whose subframe number is 9 includes CSI-RS.

When the terminal is searching for the third downlink subframe, since the subframe sequence number of the third downlink subframe is not less than the subframe sequence number of the first subframe and not greater than the subframe sequence number of the second downlink subframe, at this time the The subframe number of one subframe is 2, and the subframe number of the second downlink subframe is 9. Therefore, it can be determined that all downlink subframes with subframe numbers 2-8 can be used as the found third downlink subframe. That is, when CQI measurement is performed, any downlink subframe with subframe number 2 to 8 and the downlink subframe with subframe number 9 can be used to perform CQI measurement.

When searching for the third downlink subframe in the first measurement subset where the first downlink subframe is located, since the measurement subset where the first downlink subframe is located, that is, the measurement subframe where the downlink subframe with the subframe number 2 is located set, the measurement subset includes downlink subframes with subframe numbers 0, 2, 4, 6, and 8, then search for subframe numbers whose subframe numbers are not less than the first downlink subframe in the measurement subset, and the third downlink subframe not greater than the subframe number of the second downlink subframe, so it can be known that the found subframe number of the third subframe may be 2, 4, 6, or 8. That is, when performing CQI measurement, any one of the downlink subframes with subframe numbers 2, 4, 6, and 8 and the downlink subframe with subframe number 9 can be used for CQI measurement.

And when the downlink subframe containing the CSI-RS is a downlink subframe with a subframe number of 6, when determining the third downlink subframe, the found subframe number of the third subframe may be 2 to 5, or When searching for the third downlink subframe based on the measurement subset in which the first downlink subframe is located, the subframe sequence number of the found third downlink subframe may be 2 or 4.

Alternatively, when searching for the third downlink subframe, the third downlink subframe may also be searched and determined in the second measurement subset where the first downlink subframe is not located. Specifically, for example, the base station transmits information that triggers CQI reporting on the downlink subframe with subframe number 2, and the downlink subframe with subframe number 9 contains CSI-RS. The measurement subset in which the downlink subframe with frame number 2 is located includes: downlink subframes with subframe numbers 1, 3, 5, 7, and 9. Since the subframes with subframe numbers 3, 5, and 7 The frame number is greater than the subframe number 2, and not greater than the subframe number 9 of the second downlink subframe, so any downlink subframe with the subframe number 3, 5, or 7 can be the third downlink subframe found .

The above process is a description that the downlink subframes included in each measurement subset are not repeated, that is, each downlink subset is uniquely located in one measurement subset, and when the downlink subframes included in the measurement subset are repeated, the third The method for selecting a downlink subframe is the same as the above process, so details will not be repeated here.

In the above CQI measurement process, the terminal performs CQI measurement on one measurement subset. Of course, when the terminal performs CQI measurement, it can also perform CQI measurement on two measurement subsets respectively. When the terminal performs CQI measurement for the two measurement subsets, since the subframe sequence number of the second downlink subframe is determined, the subframe sequence number is not less than the subframe sequence number of the first downlink subframe, and is not greater than the specified The third downlink subframe with the subframe sequence number of the second downlink subframe includes at least one. When there are many downlink subframes to choose from, a measurement subframe can be selected for each measurement subset.

For example, when downlink subframes with subframe numbers 2 to 8 can all be used as the third downlink subframe, for each measurement subset, a third downlink subframe may be selected in the measurement subset as the CQI measurement downlink subframe. For example, since the downlink subframes with subframe numbers 2, 4, 6, and 8 belong to a measurement subset, and the downlink subframes with subframe numbers 3, 5, and 7 belong to a measurement subset, therefore, in the search to determine the third In the case of downlink subframes, one downlink subframe can be selected as the third downlink subframe for CQI measurement in the above two measurement subsets and downlink subframes that meet the conditions. For example, downlink subframe 2 and downlink subframe 2 can be selected. 6 is used as the third downlink subframe for CQI measurement.

Or, when performing CQI measurement on each measurement subset, determining the second downlink subframe includes: determining each measurement subset; and searching for subframe numbers not less than the first subframe in each measurement subset; The subframe sequence number of the upstream subframe, and the downlink subframe including the channel state information reference signal CSI-RS; each found downlink subframe is used as the second downlink subframe.

After each second downlink subframe is determined, when searching for and determining a third downlink subframe for each second downlink subframe, according to each second downlink subframe determined for each measurement subset, in the second downlink subframe In the measurement subset where the second downlink subframe is located, search for a third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe.

For example, at this time, the first downlink subframe with subframe number 2 transmits the information that the base station triggers CQI reporting, and includes two measurement subsets, where the downlink subframe with subframe number 2 is located in the first measurement subset , the first measurement subset includes downlink subframes with subframe numbers 0, 2, 4, 6, and 8, and the second measurement subset in which the first downlink subframe is not included includes subframe numbers 1, 3, 5, 7, and 9 downlink subframes, wherein the downlink subframes with subframe numbers 4 and 9 contain CSI-RS. Therefore, when searching for and determining the second downlink subframe, the two second downlink subframes can be found to be two downlink subframes with subframe numbers 4 and 9 respectively.

When each second downlink subframe is determined, when the third downlink subframe is selected, for the selected second downlink subframe, the selected subframe number is not less than the subframe number of the first downlink subframe, and a third downlink subframe that is not greater than the subframe sequence number of the second downlink subframe. That is, for the first second downlink subframe containing CSI-RS (downlink subframe with subframe number 4), downlink subframes with subframe numbers 2 and 3 can be selected as the third downlink subframe, for the second A second downlink subframe containing CSI-RS (the downlink subframe whose subframe number is 9), the downlink subframe whose subframe number is 2-8 can be selected as the third downlink subframe, wherein during the selection process, When the available third downlink subframes overlap, the same downlink subframe can be selected as the third downlink subframe during the two selections, or a different downlink subframe can be selected as the third downlink subframe. When choosing, you can choose flexibly according to your needs. In the above process, the downlink subframes included in the measurement subset are not repeated. When the downlink subframes included in the measurement subset are repeated, the process of determining each second downlink subframe is similar to the above process.

In the embodiment of the present invention, when searching to determine the third downlink subframe, the third downlink subframe may also be determined according to the method specified in the existing R8 and R9 versions. In addition, since the downlink CQI measurement method in the embodiment of the present invention is applicable to the case of aperiodic CQI reporting, CQI reference resources are specified in R8 and R9 versions.

Therefore, it can be seen that when searching for and determining the third downlink subframe, the difference between the subframe sequence number of the fourth downlink subframe for CQI reporting and the subframe sequence number of the first downlink subframe can be used to determine the corresponding subframe sequence number. The subframe is used as the third downlink subframe.

Fig. 4 provides the measurement and reporting process of downlink CQI for the embodiment of the present invention, the process includes the following steps:

S401: The terminal receives information that triggers reporting of channel quality information CQI transmitted by the base station on the first downlink subframe.

S402: According to the subframe sequence number of the first downlink subframe, search for the subframe sequence number not less than the subframe sequence number of the first downlink subframe in the wireless frame where the downlink subframe is located, and including channel state information The second downlink subframe of the reference signal CSI-RS.

S403: According to the subframe numbers of the first downlink subframe and the second downlink subframe, search for the subframe number not less than the subframe number of the first downlink subframe and not greater than the second downlink subframe The third downlink subframe of the subframe sequence number.

S404: Perform CQI measurement by using the found second downlink subframe and third downlink subframe.

S405: According to the subframe number of the second downlink subframe including the CSI-RS, select an uplink subframe with a subframe number greater than the second downlink subframe, and use the uplink subframe to report the measured CQI.

In the embodiment of the present invention, after the CQI measurement is performed, the terminal needs to send the measured CQI value to the base station through the uplink subframe. When the terminal selects and determines the uplink subframe for CQI transmission, the subframe of the selected uplink subframe The sequence number is greater than the subframe sequence number of the second downlink subframe including the CSI-RS.

Specifically, when the information triggered by the base station is aperiodic CQI reporting, the selection of the uplink subframe whose subframe sequence number is greater than the second downlink subframe includes: selecting the subframe sequence number greater than the second downlink subframe The subframe number of which is at least not less than 4, and the corresponding uplink subframe is used as the uplink subframe for CQI reporting. Preferably, the uplink subframe corresponding to the subframe number whose subframe number is at least not less than the subframe number of the second downlink subframe and the smallest subframe number can be selected as the uplink subframe for CQI reporting.

For example, when the subframe number of the second downlink subframe containing the CSI-RS is m, when selecting the uplink subframe for sending the CQI, the subframe number of the selected uplink subframe is m+n _{CQI_ref} , where The determination method of n _{CQI_ref} is the same as the method of determining n _{CQI_ref} in the aperiodic CQI reporting process of R8 and R9 versions, that is, the subframe number is at least 4 greater than the subframe number of the current second downlink subframe, and the subframe number is the smallest. The uplink subframe corresponding to the frame number is used as the uplink subframe for reporting the CQI, which will not be described one by one here.

Fig. 5 is a schematic structural diagram of a device for measuring downlink channel quality information provided by an embodiment of the present invention, the device comprising:

A receiving module 51, configured to receive information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe;

The search module 52 is configured to, according to the subframe sequence number of the first downlink subframe, search for the subframe sequence number not less than the subframe sequence number of the first downlink subframe in the wireless frame where the downlink subframe is located, and For the second downlink subframe containing the channel state information reference signal CSI-RS, according to the subframe numbers of the first downlink subframe and the second downlink subframe, search for the subframe whose subframe number is not less than the first downlink subframe a subframe number, and a third downlink subframe that is not greater than the subframe number of the second downlink subframe;

The measurement module 53 is configured to use the found second downlink subframe and third downlink subframe to perform CQI measurement.

The search module 52 is specifically configured to determine the first measurement subset in which the first downlink subframe is located, and in the first measurement subset, search for subframes whose sequence number is not less than that of the first downlink subframe A subframe sequence number, and a third downlink subframe that is not greater than the subframe sequence number of the second downlink subframe.

The search module 52 is specifically configured to determine the first measurement subset where the first downlink subframe is located, and in the second measurement subset where the first downlink subframe is not located, the search subframe sequence number is not less than The subframe sequence number of the first downlink subframe and the third downlink subframe that is not greater than the subframe sequence number of the second downlink subframe.

The search module 52 is specifically configured to determine each measurement subset, and search for a subframe sequence number not less than the first downlink subframe in each measurement subset, and includes a channel state information reference signal CSI - The downlink subframe of the RS, using each found downlink subframe as a second downlink subframe.

The search module 52 is specifically configured to, according to each second downlink subframe determined for each measurement subset, in the measurement subset where the second downlink subframe is located, search for a subframe whose sequence number is not less than the first downlink subframe. The subframe sequence number of the row subframe, and the third downlink subframe that is not greater than the subframe sequence number of the second downlink subframe.

In said device,

The search module 52 is further configured to select an uplink subframe whose subframe number is greater than the second downlink subframe according to the subframe number of the second downlink subframe including the CSI-RS;

The device also includes:

A reporting module 54, configured to report the measured CQI by using the uplink subframe.

The search module 52 is specifically configured to select a subframe number whose subframe number is at least 4 less than the subframe number of the second downlink subframe, and use the corresponding uplink subframe as the uplink subframe for CQI reporting.

The search module 52 is specifically configured to select an uplink subframe whose subframe number is at least 4 less than the subframe number of the second downlink subframe, and which corresponds to the subframe number with the smallest subframe number as the uplink subframe for CQI reporting. subframe.

FIG. 6 is a schematic structural diagram of a system for measuring downlink channel quality information provided by an embodiment of the present invention. The system includes:

The base station 61 is configured to transmit information triggering channel quality CQI reporting in the first downlink subframe;

The terminal 62 is configured to receive information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe, and according to the subframe sequence number of the first downlink subframe, within the wireless frame where the downlink subframe is located, Searching for a second downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and which contains a channel state information reference signal CSI-RS, according to the first downlink subframe and the second downlink subframe The subframe sequence number of the subframe, search for the third downlink subframe whose subframe sequence number is not less than the subframe sequence number of the first downlink subframe, and is not greater than the subframe sequence number of the second downlink subframe, and use the found CQI measurement is performed in the second downlink subframe and the third downlink subframe.

In the system,

The terminal 62 is further configured to, according to the subframe sequence number of the second downlink subframe containing the CSI-RS, select an uplink subframe whose subframe sequence number is greater than the second downlink subframe, and use the uplink subframe to report the measured The CQI.

The terminal 62 is specifically configured to select a subframe number whose subframe number is at least 4 less than the subframe number of the second downlink subframe, and use the corresponding uplink subframe as the uplink subframe for CQI reporting.

The terminal 62 is specifically configured to select an uplink subframe whose subframe number is at least 4 less than the subframe number of the second downlink subframe, and which corresponds to the subframe number with the smallest subframe number as the uplink subframe for CQI reporting. frame.

Embodiments of the present invention provide a method, system, and device for measuring downlink CQI. In the method, when the terminal receives the information that triggers CQI reporting transmitted by the base station through the first downlink subframe, the terminal according to the first downlink subframe Find the subframe number of the second downlink subframe that contains the CSI-RS, and find the subframe number that is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe In the third downlink subframe with the serial number, the CQI measurement is performed through the second downlink subframe and the third downlink subframe. Since in the embodiment of the present invention, two downlink subframes are determined to perform CQI measurement by searching, the problem that CQI measurement cannot be performed can be avoided, and in addition, since CQI measurement is performed through two downlink subframes, the accuracy of CQI measurement can be improved.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (18)

1. A method for measuring downlink channel quality information, comprising: The terminal receives information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe; According to the subframe sequence number of the first downlink subframe, in the wireless frame where the downlink subframe is located, search for a subframe sequence number not less than the subframe sequence number of the first downlink subframe, and include a channel state information reference signal The second downlink subframe of the CSI-RS is specifically: determine each measurement subset; in each measurement subset, respectively search for the subframe number not less than the subframe number of the first downlink subframe, and include the channel Downlink subframes of the state information reference signal CSI-RS; use each found downlink subframe as a second downlink subframe. According to the subframe sequence numbers of the first downlink subframe and the second downlink subframe, search for the subframe sequence number not less than the subframe sequence number of the first downlink subframe and not greater than the subframe sequence number of the second downlink subframe Frame sequence number, excluding the third downlink subframe of CSI-RS; The CQI measurement is performed by using the found second downlink subframe and the third downlink subframe. 2. The method according to claim 1, wherein the search subframe sequence number is not less than the subframe sequence number of the first downlink subframe and not greater than the subframe sequence number of the second downlink subframe. The three downlink subframes include: determining a first measurement subset in which the first downlink subframe is located; In the first measurement subset, search for a third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe. 3. The method according to claim 1, wherein the search subframe sequence number is not less than the subframe sequence number of the first downlink subframe, and is not greater than the subframe sequence number of the second downlink subframe. The three downlink subframes include: Determine the first measurement subset in which the first downlink subframe is located, and search for a subframe whose subframe sequence number is not less than that of the first downlink subframe in the second measurement subset in which the first downlink subframe is located. A subframe sequence number, and a third downlink subframe that is not greater than the subframe sequence number of the second downlink subframe. 4. The method according to claim 1, wherein the search subframe sequence number is not less than the subframe sequence number of the first downlink subframe, and is not greater than the subframe sequence number of the second downlink subframe. The three downlink subframes include: According to each second downlink subframe determined for each measurement subset, in the measurement subset where the second downlink subframe is located, search for a subframe sequence number not less than the subframe sequence number of the first downlink subframe, and A third downlink subframe having a subframe sequence number not greater than that of the second downlink subframe. 5. The method according to any one of claims 1 to 4, further comprising: Selecting an uplink subframe whose subframe number is greater than the second downlink subframe according to the subframe number of the second downlink subframe including the CSI-RS; Reporting the measured CQI by using the uplink subframe. 6. The method according to claim 5, wherein when the information triggered by the base station is aperiodic CQI reporting, the selected uplink subframe whose sequence number is greater than the second downlink subframe includes : Selecting a subframe number whose subframe number is at least not less than 4 than the subframe number of the second downlink subframe, and using the corresponding uplink subframe as an uplink subframe for CQI reporting. 7. The method of claim 6, further comprising: Selecting an uplink subframe whose subframe number is at least not less than the subframe number of the second downlink subframe by at least 4 and corresponding to the subframe number with the smallest subframe number as the uplink subframe for CQI reporting. 8. A measuring device for downlink channel quality information, characterized in that the device comprises: A receiving module, configured to receive information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe; A search module, configured to search for a subframe number not less than the subframe number of the first downlink subframe in the wireless frame where the downlink subframe is located according to the subframe number of the first downlink subframe, and includes The second downlink subframe of the channel state information reference signal CSI-RS is specifically: determine each measurement subset, and respectively search for the subframe sequence number of the subframe number not less than the first downlink subframe in each measurement subset , and includes the downlink subframe of the channel state information reference signal CSI-RS, each found downlink subframe is used as the second downlink subframe; according to the subframe sequence numbers of the first downlink subframe and the second downlink subframe , searching for a third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe, and does not include CSI-RS; A measurement module, configured to use the found second downlink subframe and third downlink subframe to perform CQI measurement. 9. The device according to claim 8, wherein the search module is specifically configured to determine the first measurement subset in which the first downlink subframe is located, and in the first measurement subset, search A third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe. 10. The device according to claim 8, wherein the search module is specifically configured to determine the first measurement subset in which the first downlink subframe is located, and in the subframe other than the first downlink subframe In the second measurement subset, search for a third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe. 11. The device according to claim 8, wherein the search module is specifically configured to, according to each second downlink subframe determined for each measurement subset, in the measurement subframe where the second downlink subframe is located In the subset, search for a third downlink subframe whose subframe number is not less than the subframe number of the first downlink subframe and not greater than the subframe number of the second downlink subframe. 12. The device according to any one of claims 8-11, characterized in that, in the device, The search module is further configured to select an uplink subframe whose subframe number is greater than the second downlink subframe according to the subframe number of the second downlink subframe including the CSI-RS; The device also includes: A reporting module, configured to report the measured CQI by using the uplink subframe. 13. The device according to claim 12, wherein the search module is specifically configured to select a subframe sequence number whose subframe sequence number is at least 4 less than the subframe sequence number of the second downlink subframe, and the corresponding The uplink subframe is used as an uplink subframe for CQI reporting. 14. The device according to claim 13, wherein the search module is specifically configured to select a subframe whose subframe number is at least 4 or less than the subframe number of the second downlink subframe, and which has the smallest subframe number The uplink subframe corresponding to the subframe sequence number is used as the uplink subframe for CQI reporting. 15. A measurement system for downlink channel quality information, characterized in that the system includes: a base station and a terminal, wherein the terminal includes a receiving module, a search module and a measurement module; The base station is configured to transmit information triggering channel quality CQI reporting in the first downlink subframe; The receiving module of the terminal is configured to receive information that triggers channel quality information CQI reporting transmitted by the base station on the first downlink subframe; The search module of the terminal is configured to search for a subframe whose subframe number is not smaller than the first downlink subframe in the wireless frame where the downlink subframe is located according to the subframe number of the first downlink subframe sequence number, and include the second downlink subframe of the channel state information reference signal CSI-RS, specifically: determine each measurement subset, and search for a subframe sequence number not less than the first downlink subframe in each measurement subset and the downlink subframe containing the channel state information reference signal CSI-RS, and each found downlink subframe is used as the second downlink subframe, according to the first downlink subframe and the second downlink subframe The subframe sequence number of the search subframe sequence number is not less than the subframe sequence number of the first downlink subframe, and is not greater than the subframe sequence number of the second downlink subframe, and the third downlink subframe does not include the CSI-RS ; The measurement module of the terminal is configured to use the found second downlink subframe and third downlink subframe to perform CQI measurement. 16. The system according to claim 15, wherein, in the system, the terminal further comprises: a reporting module; The search module of the terminal is further configured to select an uplink subframe whose subframe number is greater than the second downlink subframe according to the subframe number of the second downlink subframe including the CSI-RS; The reporting module of the terminal is configured to report the measured CQI by using the uplink subframe. 17. The system according to claim 16, wherein the terminal is specifically configured to select a subframe number whose subframe number is at least 4 less than the subframe number of the second downlink subframe, and the corresponding uplink The subframe is used as an uplink subframe for CQI reporting. 18. The system according to claim 16, wherein the terminal is specifically configured to select a subframe whose subframe sequence number is at least 4 less than the subframe sequence number of the second downlink subframe and has the smallest subframe sequence number The uplink subframe corresponding to the frame number is used as the uplink subframe for CQI reporting.