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Method and device for determining channel quality indication information

  • US 9,107,087 B2
  • Filed: 01/12/2012
  • Issued: 08/11/2015
  • Est. Priority Date: 01/12/2011
  • Status: Active Grant
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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