Method and device for determining channel quality indication information
First Claim
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1. A method for determining Channel Quality Indication (CQI) information, comprising:
- transmitting, by a base station (eNodeB), a Channel-State Information-Reference Symbol (CSI-RS) and cell-specific reference signal (CRS) to a terminal (User Equipment (UE));
performing, by the UE, channel measurement according to the CSI-RS or CRS;
determining, by the UE, a CQI reference resource, and determining, by the UE, the CQI value on the CQI reference resource according to the result of the channel measurement;
on a frequency domain, defining the CQI reference resource by a downlink physical resource block corresponding to a frequency band to which the CQI value related;
on a time domain, defining the CQI reference resource by a downlink subframe;
on a transmission layer domain, defining the CQI reference resource by any Rank Indicator (RI) and Pre-coding Matrix Indicator (PMI) on which the CQI is conditioned,characterized by the step of;
calculating the CQI, by the UE, by using the CRS as an measuring reference signal if the UE is configured without the PMI/RI by the eNodeB;
calculating the CQI, by the UE, by using the CSI-RS as an measuring reference signal if the UE is configured with the PMI/RI by the eNodeB;
orto the CQI reference resource, when there is a configurable measuring subset which is for CSI measurement and is formed by a channel quality information measuring subframe, then the channel measurement or interference measurement is limited to a subframe defined by the measuring subset;
configuring said measuring subset by the base station through a signalling or a non-periodic triggering;
on the time domain, the downlink subframe of the CQI reference resource needs to be defined in said measuring subset.
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Abstract
The disclosure provides a method and device for determining Channel quality indication information, which is configured to perform channel measurement based on a reference signal, so as to obtain a CQI information. The method considers the influence of multiple factors on CQI calculation, including selection of a measurement reference signal as well as the influence of multiple complex conditions on CQI calculation, thereby solving the problem that an existing system is unable to obtain accurate Channel quality indication information when using a transmission mode 9, and enhancing the flexibility and performance of the system.
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Citations
15 Claims
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1. A method for determining Channel Quality Indication (CQI) information, comprising:
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transmitting, by a base station (eNodeB), a Channel-State Information-Reference Symbol (CSI-RS) and cell-specific reference signal (CRS) to a terminal (User Equipment (UE)); performing, by the UE, channel measurement according to the CSI-RS or CRS; determining, by the UE, a CQI reference resource, and determining, by the UE, the CQI value on the CQI reference resource according to the result of the channel measurement; on a frequency domain, defining the CQI reference resource by a downlink physical resource block corresponding to a frequency band to which the CQI value related;
on a time domain, defining the CQI reference resource by a downlink subframe;
on a transmission layer domain, defining the CQI reference resource by any Rank Indicator (RI) and Pre-coding Matrix Indicator (PMI) on which the CQI is conditioned,characterized by the step of; calculating the CQI, by the UE, by using the CRS as an measuring reference signal if the UE is configured without the PMI/RI by the eNodeB;
calculating the CQI, by the UE, by using the CSI-RS as an measuring reference signal if the UE is configured with the PMI/RI by the eNodeB;
orto the CQI reference resource, when there is a configurable measuring subset which is for CSI measurement and is formed by a channel quality information measuring subframe, then the channel measurement or interference measurement is limited to a subframe defined by the measuring subset;
configuring said measuring subset by the base station through a signalling or a non-periodic triggering;
on the time domain, the downlink subframe of the CQI reference resource needs to be defined in said measuring subset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for determining Channel Quality Indication (CQI) information, comprising:
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a receiving module, which is configured to receive a Channel-State Information-Reference Symbol (CSI-RS) and/or a cell-specific reference signal (CRS) transmitted by a base station (eNodeB); a measuring module, which is configured to perform channel measurement according to the CSI-RS and/or CRS received by the receiving module; a determining module, which is configured to determine a CQI reference resource and the condition for calculating the CQI; and a calculating module, which is configured to calculate a CQI value corresponding to the CSI reference resource according to the condition determined by the determining module and a measurement result of the measuring module, wherein on a frequency domain, the CQI reference resource is defined by a downlink physical resource block corresponding to a frequency band to which a source CQI value related;
on a time domain, the CQI reference resource is defined by a downlink subframe;
on a transmission layer domain, the CQI reference resource is defined by any Rank Indicator (RI) and Pre-coding Matrix Indicator (PMI) on which the CQI is conditioned,characterized by that; if the UE is configured without the PMI/RI by the eNodeB, the channel measurement is performed by using the CRS as an measuring reference signal, if the UE is configured with the PMI/RI by the eNodeB, the channel measurement is performed by using the CSI-RS as an measuring reference signal;
orto the CQI reference resource, when there is a configurable measuring subset which is for CSI measurement and is formed by a channel quality information measuring subframe, then the channel measurement or interference measurement is limited to a subframe defined by the measuring subset;
configuring said measuring subset by the base station through a signalling or a non-periodic triggering;
on the time domain, the downlink subframe of the CQI reference resource needs to be defined in said measuring subset. - View Dependent Claims (13, 14, 15)
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Specification