Patent ID: 9107087
Filing Date: 2015-08-11
Classification: H04B,H04L,H04W

Abstract:
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; or to 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.