Method for reporting channel quality information and device thereof

Abstract

Disclosed are a method for reporting channel quality information and a device thereof, the method comprising: according to configuration information of a CSI-RS, a user equipment measuring the CSI-RS to acquire a downlink channel transmission matrix; according to a PDSCH transmission scheme used as a basis when determining a Channel Quality Indicator (CQI), and according to the measured downlink channel transmission matrix, the user equipment determining the CQI of a frequency domain reporting unit; and the user equipment reporting the determined CQI to a network side. Through the present invention, the measurement and reporting of the channel quality information based on the CSI-RS is implemented based on transmission of non-PMI feedback.

Claims

1. A method for reporting channel quality information, the method comprising: acquiring, by a User Equipment (UE), configuration information of a Channel-State Information-Reference Signal (CSI-RS); acquiring, by the UE, a downlink channel transmission matrix by measuring the CSI-RS according to the configuration information of the CSI-RS; assuming, by the UE, a transmission scheme of a Physical Downlink Shared Channel (PDSCH) according to a transmission mode of the PDSCH; when the transmission scheme is a first type of transmission scheme, calculating and reporting, by the UE, a Channel Quality Indicator (CQI) and a recommended Precoding Matrix Indicator (PMI); and when the transmission scheme is a second type of transmission scheme, calculating and reporting, by the UE, the CQI using a non-codebook precoding mode and non-PMI feedback transmission, respectively.

2. The method of claim 1, wherein the CSI-RS configuration information includes at least one of: a time-frequency position of the CSI-RS, a transmission cycle, and a number of ports for transmission of CSI-RS.

3. The method of claim 1, further comprising: acquiring, by the UE, the configuration information of the CSI-RS according to a system broadcast mode.

4. The method of claim 1, further comprising: measuring, by the UE, according to the transmission cycle of the CSI-RS, the CSI-RS transmitted from the time-frequency position indicated by the configuration information of the CSI-RS.

5. The method of claim 1, further comprising: measuring, by the UE, received interference and noise.

6. The method of claim 1, wherein the downlink channel transmission scheme used when calculating the CQI is preconfigured to the UE and base station, so that the UE and the eNB will know the downlink channel transmission scheme used when calculating the CQI before the UE reports the CQI.

7. The method of claim 1, wherein the UE measures the CSI-RS and reports the CQI according to the transmission cycle of the CSI-RS after acquiring the configuration information of the CSI-RS, when the configuration information of the CSI-RS changes, the network side informs the UE of updated configuration information of the CSI-RS by broadcast mode, and the UE then measures the CSI-RS and report the CQI after receiving the updated configuration information of the CSI-RS.

8. A user equipment (UE) comprising: a network communication interface; and a processor configured to: acquire configuration information of a Channel-State Information-Reference Signal (CSI-RS); acquire a downlink channel transmission matrix by measuring the CSI-RS according to the configuration information of the CSI-RS; assume a transmission scheme of a Physical Downlink Shared Channel (PDSCH) according to a transmission mode of the PDSCH; when the transmission scheme is a first type of transmission scheme, calculate and report a Channel Quality Indicator (CQI) and a recommended Precoding Matrix Indicator (PMI); and when the transmission scheme is a second type of transmission scheme, calculate and report the CQI using a non-codebook precoding mode and non-PMI feedback transmission, respectively.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a flow diagram of reporting channel quality information of embodiments of the present invention;

(2) FIG. 2 is a structural diagram of UE of embodiments of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE PRESENT INVENTION

(3) For the above existing problems of the current technology, the embodiments of the present invention put forward a non-PMI feedback mode-based mechanism for reporting channel quality information.

(4) In the following parts, detailed descriptions of embodiments of the present invention are made combined with drawings of the embodiments.

(5) FIG. 1 is referred to as the flow diagram of reporting channel quality information of embodiments of the present invention; which comprises:

(6) Step 101, the UE acquires configuration information of CSI-RS.

(7) To be specific, the UE can acquire the configuration information of the CSI-RS according to system broadcast mode, viz. the UE can monitor the broadcast information of the network side and acquire the carried configuration information of the CSI-RS. The CSI-RS configuration information includes time-frequency position of the CSI-RS, transmission cycle, the number of ports for transmission of CSI-RS, etc.

(8) Step 102, the UE measures the CSI-RS according to the configuration information of the CSI-RS, to acquire a downlink channel transmission matrix.

(9) Wherein, according to the transmission cycle of the CSI-RS, the UE can measure the CSI-RS transmitted from the time-frequency position indicated by the configuration information of the CSI-RS. The UE can acquire a downlink channel transmission matrix by measurement of the CSI-RS, and the channel transmission matrix could be shown as follows:

(10) $\begin{array}{cc}H=\left[\begin{array}{ccc}{h}_{11}& \mathrm{.Math.}& h_{1T}\\ \mathrm{.Math.}& & \mathrm{.Math.}\\ h_{R1}& \mathrm{.Math.}& h_{\mathrm{RT}}\end{array}\right]& \left[1\right]\end{array}$

(11) The UE can further measure the received interference and noise.

(12) Step 103, the UE determines and reports CQI to the network side according to the downlink channel transmission matrix acquired by measurement of the CSI-RS.

(13) Wherein, before reporting CQI, the UE has acquired the downlink channel transmission scheme used when calculating the CQI. To be specific, the downlink channel transmission scheme used when calculating the CQI could be preconfigured to the UE and base station, so that the UE and the eNB will know the downlink channel transmission scheme used when calculating the CQI before UE reporting CQI. Based on the reporting mode configured by the high-layer, the UE can calculate and report the CQI for each frequency domain reporting unit (such as broadband or sub-band) according to the downlink channel transmission scheme used when calculating the CQI.

(14) Wherein, reporting mode configured by the high-layer includes one of the following:

(15) Physical Uplink Control Channel (PUCCH) reporting mode 1-0;

(16) PUCCH reporting mode 2-0;

(17) Physical Uplink Shared Channel (PUSCH) reporting mode 2-0;

(18) PUSCH reporting mode 3-0.

(19) In the embodiments of the present invention, the downlink channel transmission scheme used when calculating the CQI includes:

(20) The UE assumes that the base station maps the data of the PDSCH to P (number) CSI-RS ports as per the rule of

(21) $\left[\begin{array}{c}{y}^{\left(0\right)}\\ \mathrm{.Math.}\\ y^{\left(P-1\right)}\end{array}\right]=W.Math.s.$
The value of the P could be 1, 2, 4, 8, etc. and it is equal to the number of CSI-RS ports included in the configuration information of the CSI-RS acquired by the UE.

(22) Wherein, the P1 dimension matrix w is a certain fixed matrix, or selected from a matrix set as per a preset sequence, so as to assure the eNB can get the w assumed by the UE when reporting the CQI every time. Wherein, specific definition or calculation or selection rule of Matrix w could be determined according to realization requirements or actual application.

(23) It should be noted that, the UE can measure the CSI-RS and report the CQI according to the transmission cycle of the CSI-RS after acquiring the configuration information of the CSI-RS. As long as the configuration information of the CSI-RS remains unchanged, the UE can always measure the CSI-RS according to the configuration information. When the configuration information of the CSI-RS changes, the network side could inform the updated configuration information of the CSI-RS by broadcast mode, and the UE could then measure the CSI-RS and report the CQI after receiving the updated configuration information of the CSI-RS.

(24) The UE could also acquire the configuration information of the CSI-RS in other ways besides the broadcast mode mentioned above.

(25) Based on the same technical design, the embodiments of the present invention provide a UE which could be applied to the flow mentioned above.

(26) As is shown in FIG. 2, the UE provided by embodiments of the present invention includes:

(27) Measurement module 201, used to measure the CSI-RS according to the configuration information of the CSI-RS, to acquire a downlink channel transmission matrix;

(28) Determination module 202, used to determine the CQI of a frequency domain reporting unit according to the downlink channel transmission matrix acquired by measurement of the measurement module, and the transmission scheme of the PDSCH used when determining the CQI;

(29) Reporting module 203, used to report the CQI determined by the determination module 202 to the network side.

(30) The UE could also include memory module 204, used to save the transmission scheme information of the PDSCH, the transmission scheme of the PDSCH includes:

(31) Assume that the base station maps the data of the PDSCH to P (number) CSI-RS ports as per the rule of

(32) $\left[\begin{array}{c}{y}^{\left(0\right)}\\ \mathrm{.Math.}\\ y^{\left(P-1\right)}\end{array}\right]=W.Math.s;$
wherein, W represents a P1 dimension matrix and is known to the UE and the network side before reporting CQI.

(33) The mode of reporting the CQI by reporting module 203 of the EU is one of the following:

(34) Physical uplink control channel (PUCCH) reporting mode 1-0;

(35) PUCCH reporting mode 2-0;

(36) Physical uplink shared channel (PUSCH) reporting mode 2-0;

(37) PUSCH reporting mode 3-0.

(38) The UE mentioned above could also include acquiring module 205, used to acquire the configuration information of the CSI-RS by broadcast mode, and save the configuration information of the CSI-RS into memory module 204.

(39) Through the description of the embodiments of the present invention, the UE acquires a downlink channel transmission matrix by measuring the CSI-RS, determines and reports the CQI according to the downlink channel transmission matrix as well as the preconfigured transmission scheme of the PDSCH used when determining the CQI, realizes measurement and reporting of CSI-RS-based channel quality information on the basis of non-PMI feedback transmission. Wherein, the embodiments of the present invention assume the PDSCH is transmitted by Ws scheme, so as to enable a easy and simple CQI determination.

(40) The technical personnel in this field can be understood that the modules can be distributed in device of the embodiments according to the description of the embodiments above, and also can be varied in one or multiply device of the embodiments. The modules of the embodiments can be combined into a module, and also can be further split into several sub-modules.

(41) Through the description of the embodiments above, the technical personnel in this field can understand clearly that the present invention can be implemented by software and necessary general hardware platform or hardware (the former is the best in most cases). Based on this understanding, the technical scheme or the part making contributions to the prior art of the present invention can be embodied by a form of software products essentially which can be saved in a storage medium, including a number of instructions for making a computer device (such as personal computers, servers, or network equipments, etc.) implement the methods described in the embodiments of the present invention.

(42) The descriptions above are only preferred embodiments, it should be pointed out, that for general technical personnel in this field, on the premise of not breaking away from principles of the present invention, some improvements and decorating can be done, which should be as the protection scope of the present invention.