Patent ID: 8559328
Filing Date: 2013-10-15
Classification: H04L,H04W

Abstract:
1. A method for reporting channel state information aperiodically, comprising: preconfiguring a type and length of a receiving window for channel state information required by a User Equipment (UE), a maximal reporting period and a minimal reporting period of the channel state information, a criterion for determining a change speed of the channel state information, and a mapping relationship between the change speed degree of the channel state information and a reporting period adjusting value; the method further comprising: collecting the channel state information reported by the UE through the configured receiving window; and determining the change speed degree of the channel state of the UE according to the criterion for determining a change speed of the channel state information; deciding whether the UE needs to perform aperiodic reporting according to the mapping relationship between the change speed degree of the channel state information and a reporting period adjusting value, and determining timing for the aperiodic reporting if needed, wherein the step of preconfiguring the maximal reporting period and the minimal reporting period of the channel state information is according to the type of the channel state information and comprises: when the channel state information is a Channel Quality Indicator (CQI) of each data stream, setting the maximal reporting period of the CQI as a numerical value between 20 milliseconds and 50 milliseconds, and setting the minimal reporting period of the CQI as 2 milliseconds; when the channel state information is a Precoding Matrix Index (PMI), setting the maximal reporting period of the PMI as a numerical value between 20 milliseconds and 50 milliseconds, and setting the minimal reporting period of the PMI as 2 milliseconds; and when the channel state information is the RI, setting the maximal reporting period of the RI as a numerical value between 100 milliseconds and 500 milliseconds, and setting the minimal reporting period of the RI as 10 milliseconds.